List of shipwrecks in June 1917

The list of shipwrecks in June 1917 includes some ships sunk, foundered, grounded, or otherwise lost during June 1917.

1 June

 * SS Cavina (1915) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 45 nmi west by south of the Fastnet Rock (50.93333°N, -10.58333°W) by SMU U-88 . Her crew survived.
 *  Domenico Miscuraca ( undefined): World War I: The barquentine was shelled and sunk in the Mediterranean Sea west of Sicily (37.63333°N, 12.11667°W) by SMU UC-25.
 * Teal ( undefined): World War I: The trawler was shelled and sunk in the Atlantic Ocean 57 nmi north west by north of Skule Skerry (59.21667°N, -4.26667°W) by SMU U-57 . Her crew survived.
 *  Vittoria) ( undefined): World War I: The brigantine was shelled and sunk in the Mediterranean Sea west of Sicily (37.08333°N, 12.11667°W) by SMU UC-25.

2 June

 * SS Cameronia (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 50 nmi north west by north of Alexandria, Egypt (31.88333°N, 29.31667°W) by SMU UC-34 with the loss of 42 lives.
 * SS Eliofilo (1897) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean off Ouessant, Finistère, France (48.45°N, -8.51667°W) by SMU U-87 . Her crew survived.
 * SS Ereaga (1890) (🇪🇸 Spain): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay off Mimizan, Landes, France by SMU UC-72 . Her crew survived.
 * SS Harfursfjord (1882) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean south of Iceland (60.41667°N, -16.33333°W) by SMU U-155 . Her crew survived.
 * Prudence ( undefined): World War I: The fishing smack was shelled and sunk in the Atlantic Ocean 15 nmi west south west of the Eddystone Lighthouse by SMU UB-23 . Her crew survived.
 * Shamrock ( undefined): World War I: The trawler was shelled and sunk in the Atlantic Ocean 66 nmi north east of Sule Skerry by SMU U-96 . Her crew survived.
 * SS Skarpsno (1889) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Bay of Biscay (44.3°N, -3.83333°W) by SMU UC-72 with the loss of seventeen of her crew.
 * St. Bernard ( undefined): World War I: The trawler was shelled and sunk in the Atlantic Ocean 65 nmi north by west of Noup Head, Orkney Islands by SMU U-96 . Her crew survived.
 * SS St. Sunniva (1912) (🇳🇴 Norway): World War I: The cargo ship struck a mine and sank in the Bay of Biscay off Saint-Jean-de-Luz, Pyrénées-Atlantiques, France (43.43333°N, -1.68333°W) with the loss of four of her crew.
 * Wairuna ( undefined): World War I: The cargo ship was scuttled in the Pacific Ocean off Raoul Island, New Zealand by SMS Wolf (auxiliary cruiser).

3 June

 *  Elisabeth (🇫🇷 France): World War I: The barque was scuttled in the English Channel 20 nmi south of The Lizard, Cornwall, United Kingdom (49.75°N, -5.08333°W) by SMU UC-29 . Her crew survived.
 * HMT George V : The naval trawler was lost on this date.
 * Giralda ( undefined): World War I: The fishing smack struck a mine and sank in the North Sea. Her crew survived.
 * SS Greenbank (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 12 nmi north of Cape Falcon, Algeria (36.08333°N, -1.06667°W) by SMU U-33 (Germany) with the loss of a crew member.
 * SS Hollington (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 14 nmi south of the Faroe Islands by SMU U-95 with the loss of 30 of her crew.
 * SS Islandmore (1909) ( undefined): World War I: The collier was shelled and sunk in the Mediterranean Sea 20 nmi north west of Cape Falcon (35.86667°N, -1.15°W) by SMU U-33 (Germany) with the loss of two crew.
 *  Manin B. ( undefined): World War I: The barque was scuttled in the Mediterranean Sea 54 nmi off Cabo Creux (42.31667°N, 4.46667°W) by SMU U-72.
 * SS Merioneth (1916) ( undefined): World War I: The cargo ship was shelled and sunk in the Norwegian Sea 105 nmi west by north of Tromsø, Norway (71.33333°N, 16.33333°W) by SMU U-28 (Germany) . Her crew survived.
 * Petronella Madre ( undefined): World War I: The sailing vessel was sunk in the Strait of Sicily by SMU U-39.
 * SS Portofino (1912) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 3 nmi east by north of the Pendeen Lighthouse, Cornwall by SMU UC-66 with the loss of three of her crew.
 *  Rosario' (🇺🇾 Uruguay): World War I: The barque was scuttled in the Bay of Biscay 80 nmi off the mouth of the Gironde by SMU UC-72.
 * SS Sten II ( undefined): World War I: The coaster was scuttled in the Gulf of Bothnia by SMU UC-58.
 * Virgilia ( undefined): World War I: The trawler was scuttled in the North Sea 5 nmi east of Girdle Ness, Aberdeenshire (57.16667°N, -1.85°W) by SMU UC-77 . Her crew survived, but her captain was taken as a prisoner of war.
 * SS Vulcanus (1883) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea off Cape Rizzutto, Italy (37.78333°N, 17.78333°W) by SMU U-47 (Germany) . Her crew survived.

4 June

 * SS Algol (1902) ( undefined): World War I: The cargo ship was sunk in the Norwegian Sea 70 nmi north of the North Cape, Norway (71.5°N, 26°W) by SMU U-28 (Germany).
 * SS City of Baroda (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 90 nmi north west by west of Tory Island, County Donegal (56°N, -10.33333°W) by SMU UC-53 . Her crew survived.
 *  Clara (🇸🇪 Sweden): World War I: The barque was scuttled in the North Sea 70 nmi north of Foula, Shetland Islands, United Kingdom by SMU UC-55 . Her crew survived.
 *  Juno (🇳🇴 Norway): World War I: The barque was shelled and sunk in the North Sea north east of the Shetland Islands, United Kingdom 60.5°N, -0.75°W) by SMU U-43 (Germany) . Her crew survived.
 * SS Manchester Trader (1902) ( undefined): The cargo ship was shelled and sunk in the Mediterranean Sea 8 nmi off Pantelleria, Italy (36.96667°N, 12.6°W) by SMU U-65 (Germany) with the loss of a crew member. One of the survivors was taken as a prisoner of war.
 * SS Orion (1890) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the Atlantic Ocean north of the Shetland Islands, United Kingdom (62.23333°N, 1.03333°W) by SMU U-71 . Her crew survived.
 * SS Phemius (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 80 nmi north west of Eagle Island, County Mayo (54.93333°N, -12.11667°W by SMU UC-45 . Her crew survived.
 * HMT Southland ( undefined): World War I: The troopship was torpedoed and sunk in the Atlantic Ocean 140 nmi off Tory Island, County Donegal (56.16667°N, -12.23333°W)by SMU UB-14 with the loss of 4 lives.
 *  Songelv (🇳🇴 Norway): World War I: The full-rigged ship was sunk in the Atlantic Ocean 80 to 90 nmi south west by west of the Bishop Rock, Isles of Scilly, United Kingdom by SMU UC-29 . Her crew survived.
 * SMS Wildfang : World War I: The Huszar-class destroyer struck a mine and sank in the Adriatic Sea off Brijuni.

5 June

 * Alaska (🇳🇴 Norway): World War I: The fishing vessel was sunk in the Barents Sea 30 nmi north east of Vardø, Finnmark (71.41667°N, 35.81667°W) by SMU U-28 (Germany).
 * SS Amor (1902) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 200 nmi north west of the Fastnet Rock (52.73333°N, -13.7°W) by SMU U-66.
 *  C. Thorén (🇸🇪 Sweden): World War I: The barquentine was sunk in the North Sea (61.21667°N, 2.71667°W) by SMU U-71 . Her crew survived.
 * Duen (🇳🇴 Norway): World War I: The fishing vessel was sunk in the Barents Sea north of Vardø by SMU U-28 (Germany).
 *  Götha (🇸🇪 Sweden): World War I: The barquentine was sunk in the North Sea (61.21667°N, 2.71667°W) by SMU U-71 . Her crew survived.
 *  Laura Ann ( undefined): World War I: The schooner was shelled and sunk in the English Channel 20 nmi south south east of Beachy Head, East Sussex by SMU UB-23 with the loss of a crew member.
 * SS Kallundborg (1898) ( undefined): World War I: The cargo ship was scuttled in the Mediterranean Sea 80 nmi south south west of Toulon, Var, France (42.96667°N, 5.63333°W) by SMU U-64 (Germany) with the loss of a crew member.
 * SS Manchester Miller (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 190 nmi north west of the Fastnet Rock (52.81667°N, -14.11667°W) by SMU U-66 with the loss of eight crew.
 * SMS S20 : World War I: The S13-class torpedo boat was sunk in the North Sea off the coast of Belgium by HMS Canterbury (1915) and HMS Conquest (1915).
 * Sydkap (🇳🇴 Norway): World War I: The fishing vessel was sunk in the Barents Sea north north east of Vardø (71.86667°N, 35.81667°W) by SMU U-28 (Germany).

6 June

 * SS Anton (1882) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea (56.75°N, -1.08333°W) by SMU UC-77.
 *  Cornelia (🇳🇱 Netherlands): World War I: The schooner was sunk in the English Channel west of Jersey, Channel Islands (49.16667°N, -2.66667°W) by SMU UB-18.
 * SS Diane (1882) (🇫🇷 France): World War I: The coaster was sunk in the Mediterranean Sea off Oran, Algeria (37.31667°N, 11.7°W) by SMU U-39 . Her crew survived.
 * Edvard (🇸🇪 Sweden): World War I: The sailing vessel was scuttled in the Baltic Sea off Rauma, Finland by SMU UC-58 . Her crew survived.
 * Elianna (🇸🇪 Sweden): World War I: The sailing vessel was scuttled in the Baltic Sea off Rauma by SMU UC-58 . Her crew survived.
 * SS Eemdijk (1910) (🇳🇱 Netherlands): World War I: The cargo ship was sunk in the Atlantic Ocean north of the Shetland Islands, United Kingdom (61.66667°N, -1.66667°W) by SMU U-88 . Her crew survived.
 * SS Harald Klitgaard (1884) (🇩🇰 Denmark): World War I: The cagro ship was torpedoed and sunk in the North Sea 28 nmi north of the Farne Islands, Northumberland, United Kingdom by SMU UC-77  with the loss of a crew member.
 * Oriana (🇦🇷 Argentina): World War I: The sailing vessel was scuttled in the Mediterranean Sea 2 nmi south east of Cap Camarat, Var, France (42.7°N, 6.75°W) by SMU U-64 (Germany) . Her crew survived; they were rescued by the tug Indefatiguable (🇫🇷 France).
 * SS Parthenia (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 49.46667°N, -9.25°W) by SMU U-69 with the loss of three crew.
 * SS Saint Eloi (1909) (🇫🇷 France): World War I: The cargo ship was sunk in the Bay of Biscay off the Île d'Yeu, Vendée by SMU UC-72.
 * SS S.N.A. 2 (1911) (🇫🇷 France): World War I: The cargo ship was sunk in the North Sea 10 nmi north east of Scarborough, Yorkshire by SMU UB-21.

7 June

 * SS Cranmore (1905) ( undefined): World War I: The cargo ship was torpedoed and damaged in the Atlantic Ocean 150 nmi north west of the Fastnet Rock (52.76667°N, -14.4°W) by SMU U-66 . She was beached but was later refloated.
 * SS Errington Court (1909) ( undefined): World War I: The cargo ship struck a mine in the Mediterranean Sea pff Port-la-Nouvelle, Aude, France and was beached. She was later refloated.
 * Golden Hope ( undefined): World War I: The drifter was scuttled in the North Sea 30 nmi east of Kinnaird Head, Aberdeenshire by SMU UC-45 . Her crew survived.
 * SS Hafnia (1888) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the Bay of Biscay south west of the Cordouan Lighthouse, Gironde, France (45.4°N, -1.25°W) by SMU UC-21 . Her crew survived.
 * Il Dionisio ( undefined): World War I: The sailing vessel was sunk in the Strait of Sicily by SMU U-33 (Germany).
 * SS Ikalis (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 170 nmi north west of the Fastnet Rock (52.31667°N, -13.95°W) by SMU U-66 . Her crew survived.
 * SS John Bakke (1913) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea east of the Shetland Islands, United Kingdom by SMU U-88 . Her crew survived.
 * SS Jonathan Holt (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 130 nmi north west by west of the Fastnet Rock by SMU U-54 . Her crew survived.
 * Liliana ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea off Alexandria, Egypt (32.71667°N, 31.66667°W) by SMU UC-34.
 * SS Mahopac (1887) ( undefined): World War I: The cargo ship was torpedoed and damaged in the English Channel (50.73333°N, -0.2°W) by SMU UB-40 . She was beached but was later refloated.
 *  Mama Filomena ( undefined): World War I: The brigantine was shelled and sunk in the Gulf of Lion (42.06667°N, 3.91667°W) by SMU U-64 (Germany).
 * Rosa M. ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea (37.83333°N, 15.88333°W) by SMU U-65 (Germany).
 * San Antonio ( undefined): World War I: The sailing vessel was sunk in the Strait of Sicily by SMU U-33 (Germany).
 * SS Sir Francis (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 2 nmi north east of Scarborough, Yorkshire (54.31667°N, -0.36667°W) by SMU UB-21 with the loss of ten of her crew.
 * SM UC-29 : World War I: The Type UC IIsubmarine was shelled and sunk by Q-ship HMS Pargust, which it had attacked. Twenty-three of her 25 crew were killed.
 *  Wilhelm ( undefined): World War I: The schooner was shelled and sunk in the English Channel 20 nmi south east by south of The Lizard, Cornwall (49.76667°N, -4.76667°W) by SMU UC-75 . Her crew survived.
 *  Yuba (🇳🇴 Norway): World War I: The barque was shelled and sunk in the Atlantic Ocean by SMU U-50 . Her crew survived.

8 June

 * Cariad ( undefined): World War I: The fishing vessel was scuttled in the English Channel 6 nmi east by south of Start Point, Devon by SMU UB-18 . Her crew survived.
 * SS Cheltonian (1911) ( undefined): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 54 nmi west by south of the Planier Lighthouse, Bouches-du-Rhône, France (42.76667°N, 4.66667°W) by SMU U-72 . Her crew survived, but two of them were taken as prisoners of war.
 * SS Enidwen (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 170 nmi west north west of the Fastnet Rock (53.15°N, -13.88333°W) by SMU U-69 . Her crew survived.
 * Felicina ( undefined): World War I: The sailing vessel was sunk in the Gulf of Lion (42.95°N, 4.63333°W) by SMU U-72.
 * SS Huntstrick (1902) ( undefined): World War I: The troopship was torpedoed and sunk in the Atlantic Ocean 80 nmi west north west of Cape Spartel, Morocco (35.86667°N, -6.78333°W) by SMU U-39 with the loss of fifteen lives.
 * SS Isle of Jura (1906) ( undefined): World War I: The cargo ship was scuttled in the Atlantic Ocean 15 nmi west south west of Cape Spartel (35.73333°N, -6.41667°W) by SMU U-39 with the loss of two crew.
 * HMML 540 and HMML 541 (both ): World War I: The motor launches were lost when SS Huntstrick (1906) ( undefined) was sunk by SMU U-39.
 * Ocean's Pride ( undefined): World War I: The fishin vessel was scuttled in the English Channel 9 nmi east by south of Start Point by SMU UB-18 . Her crew survived.
 * Onward ( undefined): World War I: The fishing vessel was scuttled in the English Channel 9 nmi east of Start Point by SMU UB-18 . Her crew survived.
 * SS Orator (1905) ( undefined): World War I: The cargo liner was torpedoed and sunk in the Atlantic Ocean 85 nmi west north west of the Fastnet Rock (51.03333°N, -11.75°W) by SMU U-96 with the loss of five of her crew.
 *  Phantom ( undefined): World War I: The brig was shelled and sunk in the English Channel 25 nmi north north west of Cap La Heve, Seine-Maritime, France by SMU UB-40 with the loss of three of her crew.
 * SS Saragossa (1916) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 178 nmi north west of the Fastnet Rock by SMU U-69 . Her crew survived.
 * SS Sequanna (1898) (🇫🇷 France): World War I: The troopship was torpedoed and sunk in the Bay of Biscay 5 nmi south east of the Pointe des Corbeaux, Île d'Yeu, Vendée (46.6°N, -2.3°W) by SMU UC-72 with the loss of 207 of the 665 people on board.
 * Sverre II (🇳🇴 Norway): World War I: The fishing vessel was sunk in the Barents Sea north east of Vardø, Finnmark (71°N, 36°W) by SMU U-28 (Germany).
 * Torbay Lass ( undefined): World War I: The fishing vessel was scuttled in the English Channel 9 nmi east of Start Point by SMU UB-18 . Her crew survived.
 * SS Valdieri (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 50 nmi west north west of Cape Spartel (35.76667°N, -6.86667°W) by SMU U-39.
 * SS Vinaes (1916) (🇳🇴 Norway): World War I: The cargo ship was sunk in the English Channel 15 nmi east north east of Barfleur, Manche, France by SMU UB-32 with the loss of nine of her crew.

9 June

 * SS Achilles (1900) ( undefined): World War I: The coaster was shelled and sunk in the Atlantic Ocean 75 nmi south west by west of the Fastnet Rock (51.16667°N, -10.25°W) by SMU U-55 and SMU U-95 (both ). Her crew survived, but two of them were taken as prisoners of war.
 * SS Ada (1881) (🇸🇪 Sweden): World War I: The cargo ship was torpedoed and sunk in the North Sea 20 nmi east of Aberdeen, United Kingdom by SMU U-61 with the loss of three crew.
 * Amphitrite (🇵🇹 Portugal): World War I: The sailing vessel was scuttled in the Atlantic Ocean 40 nmi off Cape Prior, Spain by SMU UC-48.
 * SS Appledore (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 165 nmi north west by west of the Fastnet Rock (48.7°N, -8.76667°W) by SMU U-70 . Her crew survived.
 * SS Baron Cawdor (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 150 nmi south west by south of the Fastnet Rock by SMU U-96 with the loss of three of her crew.
 * SS Bravore (1883) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Mediterranean Sea 70 nmi off Toulon, Var, France (42.08333°N, 5.16667°W) by SMU U-72 . Her crew survived.
 * SS Dana (1905) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the North Sea 42 nmi south of Lerwick, Shetland Islands, United Kingdom by SMU U-61 with the loss of four crew.
 *  Deveron (🇳🇴 Norway): World War I: The barque was torpedoed and sunk in the Atlantic Ocean 25 nmi north north east of North Rona, United Kingdom by SMU U-94 with the loss of four of her crew.
 * SS Egyptiana (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 120 nmi west south west of the Isles of Scilly by SMU U-70 . Her crew survived.
 * Eugene Mathilde (🇫🇷 France): World War I: The fishing vessel was sunk in the English Channel off the coast of Seine-Maritime by SMU UB-40.
 * SS Fert (1909) ( undefined): The cargo ship was sunk in the Mediterranean Sea 0.75 nmi off Cape Tortosa, Spain (40.6°N, 0.91667°W) by SMU U-64 (Germany).
 * François Georgette (🇫🇷 France): The fishing vessel was sunk in the English Channel off the coast of Seine-Maritime by SMU UB-40.
 *  General Laurie ( undefined): World War I: The schooner was set afire and scuttled in the Mediterranean Sea 75 nmi west by south of Marseille, Var (42.15°N, 5°W) by SMU U-72 . Her crew survived.
 * SS Gratangen (1916) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Mediterranean Sea 6 nmi off Cape Torotsa (40.73333°N, 1.03333°W) by SMU U-64 (Germany) . Her crew survived.
 * SS Harbury (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 170 nmi west north west of Ouessant, Finistère, France (47.78333°N, -9.26667°W) by SMU U-70 with the loss of twelve crew.
 * SS Lilly (1890) (🇩🇰 Denmark): World War I: The cargo ship was scuttled in the Atlantic Ocean 3 nmi off the Montedor Lighthouse, Portugal (41.66667°N, -9.75°W) by SMU UC-53 . Her crew survived.
 * Ludwig (🇸🇪 Sweden): World War I: The sailing vessel was sunk in the Baltic Sea 25 nmi north of Oerker by SMU UC-57.
 * Marjorie ( undefined): World War I: The auxiliary ketch was scuttled in the English Channel 30 nmi south east by south of The Lizard, Cornwall (49.6°N, -4.68333°W) by SMU UB-18 . Her crew survived.
 * SS Montebello (1887) ( undefined): World War I: The cargo ship was sunk in the Gulf of Lion (42.05°N, 5.16667°W) by SMU U-72 . Her crew survived.
 *  Roland (🇫🇷 France): World War I: The barque was sunk in the Ionian Sea 30 nmi west south west of Cythera, Greece (35.83333°N, 22.01667°W) by SMU U-27 (Austria-Hungary).
 * SS Tordenvore (1884) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean south west of Cape Finisterre, Spain (42.5°N, -9.13333°W) by SMU UC-53 . Her crew survived.

10 June

 * SS Annam (1899) (🇫🇷 France): World War I: The cargo liner was sunk in the Ionian Sea 20 nmi south of Sapientza, Greece (36.81667°N, 21.38333°W) by SMU UC-35.
 * SS Bay State (1915) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 250 nmi north west of the Fastnet Rock (53°N, -16.15°W) by SMU U-66 . Her crew survived.
 * SS Betty (1898) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 45 nmi north west of North Rona, United Kingdom (59.5°N, -6.25°W) by SMU U-61.
 * SS Clan Alpine (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 40 nmi north by east of Muckle Flugga, Shetland Islands by SMU U-60 with the loss of eight crew.
 * SS Dulwich (1916) ( undefined): World War I: The cargo ship struck a mine and sank in the North Sea 7 nmi north by east of the Shipwash Lightship ( undefined) (52.13333°N, 1.75°W) by SMU UB-12 with the loss of five of her crew.
 * SS Galicia (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 140 nmi south west by south of the Fastnet Rock (48.91667°N, -10°W) by SMU U-70 with the loss of four crew.
 * HMS Grafton (1892) : World War I: The Edgar-class cruiser was torpedoed and damaged in the Mediterranean Sea 150 nmi east of Malta by SMU UB-43.
 * SS Haulwen (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 250 nmi north west of the Fastnet Rock (52.8°N, -16°W) by SMU U-43 (Germany) wit the loss of four crew.
 * Henri Jeanne (🇫🇷 France): World War I: The fishing vessel was sunk in the English Channel off the coast of Seine-Maritime by SMU UB-40.
 * FRENCH TRAWLER Jupiter I : World War I: The naval trawler struck a mine and sank in the English Channel off Calais, Pas-de-Calais (50.98333°N, 1.78333°W) with the loss of ten of her crew.
 * Kleopatra (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Doro Channel by SMU UC-23.
 * Madeleine (🇫🇷 France): World War I: The fishing vessel was scuttled in the English Channel off Le Havre, Seine-Maritime by SMU UB-40.
 * SS Marie Elsie (1895) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Barents Sea 125 nmi north west of Cape Teriberski, Russia (71.35°N, 34.26667°W) by SMU U-28 (Germany) with the loss of three of her crew.
 * SS Perla (1912) ( undefined): World War I: The cargo ship was sunk in the Barents Sea 130 nmi west by north of Cape Teriberski (71.38333°N, 35.43333°W) by SMU U-28 (Germany) with the loss of four crew.
 * SS Petrolite (1894) (🇺🇸 United States): World War I: The tanker was sunk in the Atlantic Ocean 185 nmi west of Cape Spartel, Morocco (35.05°N, -9.21667°W) by SMU U-39 . Her crew survived.
 * SS Ribera (1915) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 70 nmi north of Cape Wrath, Sutherland by SMU U-61 . Her crew survived.
 *  Santa Maria (🇵🇹 Portugal): World War I: The three-masted schooner was scuttled in the Atlantic Ocean 6 nmi south of the Berlingas (39.18333°N, -9.58333°W) by SMU UC-53.
 * SS Scottish Heather (1895) (🇨🇦 Canada): World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 440 nmi west by south of the Fastnet Rock (46.98333°N, -18.2°W) by SMU U-155 with the loss of a crew member.
 * SS Solhaug (1894) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Cantabrian Sea 5 nmi east by south of Cape Peñas, Spain by SMU UC-48 . Her crew survived.
 * Stylianos (🇪🇬 Egypt): World War I: The sailing vessel was sunk in the Mediterranean Sea by SMU UC-74 . Her crew survived.
 * HM TORPEDO BOAT 117 : The torpedo boat collided with SS Kamourska ( undefined) and sank in the English Channel.

11 June

 * SS Anglian (1896) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 43 nmi souht west by west of the Bishop Rock, Isles of Scilly (49.36667°N, -7.2°W) by SMU UC-75 with the loss of a crew member.
 *  August (🇸🇪 Sweden): World War I: The ketch was sunk in the Baltic Sea 7 nmi off the Unterstens Lighthouse by SMU UC-58 . Her crew survived.
 * SS Benha (1891) ( undefined): World War I: The cagro ship was scuttled in the Mediterranean Sea 50 nmi north east of Marsa Susa, Libya (33.75°N, 24.16667°W) by SMU UC-74 . Her crew survived.
 * SS Breid (1897) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 10 nmi east by south of Noss, Shetland Islands, United Kingdom by SMU UC-41 . Her crew survived.
 * SS City of Perth (1890) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 195 nmi south south west of the Fastnet Rock (48.1°N, -10.5°W) by SMU U-70 with the loss of eight of her crew.
 * SS Huntsholm (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 4 nmi east by south of the Owers Lightship ( undefined) by SMU UB-40 . Her crew survived.
 * SS Mar Cor (1894) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean west of the Bishop Rock by SMU UB-32 . Her crew survived.
 * Sibens ( undefined): World War I: The sailing vessel was scuttled in the Atlantic Ocean off the Santa Maria Lighthouse, Portugal (36.86667°N, -8.13333°W) by SMU UC-53.
 * SS Sigrun (1899) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 180 nmi west of the Fastnet Rock by SMU U-50 . Her crew survived.
 * SS Teviotdale (1894) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 330 nmi north west by west of the Fastnet Rock (52.33333°N, -18.45°W by SMU U-43 (Germany) with the loss of a crew member.
 * Wera ( undefined): World War I: The sailing vessel was scuttled in the Atlantic Ocean 100 nmi off Cadiz, Spain (35.18333°N, -8.18333°W) by SMU U-39.
 * HMS Zylpha : World War I: The Q-ship was torpedoed and damaged in the Atlantic Ocean south west of Ireland (51.33333°N, -11°W) by SMU U-82 with the loss of a crew member. She was taken under tow but sank on 15 June.

12 June

 *  Alexandre (🇫🇷 France): World War I: The barque was set afire and sunk in the English Channel off Fécamp, Seine-Maritime by SMU UC-69.
 *  Alfred ( undefined): World War I: The schooner was scuttled in the English Channel off Boulogne, Pas-de-Calais, France by SMU UB-40 . Her crew survived.
 * Alwyn ( undefined): World War I: The ketch was scuttled in the North Sea 5 nmi south east of Girdleness, Aberdeenshire (57.08333°N, -1.91667°W) by SMU UB-41 . Her crew survived.
 * SS Amakura (1893) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 180 nmi north west of Tory Island, County Donegal by SMU U-94 with the loss of two of her crew.
 * HMT Carew Castle : World War I: The naval trawler struck a mine and sank in the Bristol Channel off Hartland Point, Devon (50.96667°N, -4.6°W) with the loss of three of her crew.
 * Gaita ( undefined): World War I: The sailing vessel was scuttled in the Atlantic Ocean 40 nmi off Cape Spartel, Morocco (35.91667°N, -6.86667°W) by SMU U-39.
 * SS Moreni (1913) (🇺🇸 United States): World War I: The tanker was sunk in the Mediterranean Sea 17 nmi south east of Tabarca, Spain (37.86667°N, 0.23333°W) by SMU U-64 (Germany) with the loss of four crew.
 * Premier ( undefined): The tug broke in two at Halifax, Nova Scotia, Canada and was a total loss.
 * SS Polyxena (1896) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 57 nmi west of the Fastnet Rock (51.1°N, -11.08333°W) by SMU U-95 with the loss of seven of her crew.
 * SS Symra (1898) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 5 nmi south west of Huelva, Portugal by SMU UC-53 . Her crew survived.
 * SS South Point (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 30 nmi south west of the Bishop Rock, Isles of Scilly (49.71667°N, -7°W) by SMU UB-32 . Her crew survived.
 * SMU UC-66 : World War I: The Type UC II submarine was depth charged and sunk in the English Channel by HMT Sea King with the loss of all 26 crew.

13 June

 * Aghios Nicolaos (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea west of Icaria by SMU UC-23.
 * Biagio ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea off Cape Camaret, France (43.31667°N, 6.98333°W) by SMU U-72.
 *  Candace (🇳🇴 Norway: World War I: The barque was sunk in the North Sea 50 nmi south west of Utsira, Vest-Agder by SMU U-62 . Her crew survived.
 * SS Cederic (1905) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of Tory Island, County Donegal, United Kingdom (55.36667°N, -12.05°W) by SMU U-94 . Her crew survived.
 * SS Darius (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 210 nmi south west of the Fastnet Rock by SMU U-54 with the loss of fifteen crew.
 *  Ernestine (🇫🇷 France): World War I: The schooner was sunk in the Bay of Biscay 6 nmi west north west of Cap Ferret, Gironde by SMU UC-48.
 * ST Eugene F. Moran ( undefined): The tug foundered 1 nmi off St. John's, Newfoundland.
 * SS Kelvinbank (1905) ( undefined): World War I: The cago ship was torpedoed and sunk in the Atlantic Ocean 100 nmi north of Cape Wrath, Sutherland by SMU U-69 with the loss of sixteen of her crew.
 * USS McCulloch (1897) : The patrol boat collided with SS Governor (🇺🇸 United States and sank in the Pacific Ocean 3 nmi north west of Point Conception, California.
 *  Santo ( undefined): World War I: The barque was shelled and sunk in the Mediterranean Sea off Cape Camarat, France by SMU U-72 . Her crew survived.
 * SS Silverburn (1914) ( undefined): World War I: The coaster was shelled and sunk in the North Sea 4 nmi south of Aberdeen (57.06667°N, -1.9°W) by SMU UB-41 . Her crew survived.
 * SS St. Andrews (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 4 nmi west of Cape Spartivento, Calabria, Italy by SMU UC-38 with the loss of three of her crew.
 *  Storegut (🇳🇴 Norway): World War I: The four-masted barque was shelled and sunk in the Atlantic Ocean 235 nmi south west of Land's End, Cornwall, United Kingdom (48.38333°N, -10.46667°W) by SMU U-82 . Her crew survived.
 * Sylvia (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea 70 nmi west of Olmestad by SMU U-62 . Her crew survived.

14 June

 * SS Angantyr (1906) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the North Sea south east of Aberdeen, United Kingdom by SMU UB-41 with the loss of a crew member.
 * HMS Avenger (1915) : World War I: The armed merchant cruiser was sunk in the Atlantic Ocean west of the Shetland Islands (60.36667°N, -4.58333°W) by SMU U-69 with the loss of a crew member.
 * SS Aysgarth (1896) ( undefined): World War I: The cargo ship was scuttled in the Atlantic Ocean 430 nmi west north west of Cape Finisterre, Spain (42.83333°N, -18.86667°W) by SMU U-155 with the loss of three of her crew.
 * SS Carthaginia (1884) ( undefined): World War I: The cargo ship struck a mine and sank in the Atlantic Ocean 2.5 nmi north west of the Inishtrahull Lighthouse, County Donegal (55.46667°N, -7.35833°W). Her crew survived, they were rescued by a Royal Navy destroyer.
 *  Cedarbank (🇳🇴 Norway): World War I: The four-masted barque was torpedoed and sunk in the North Sea (60.36667°N, 2.75°W by SMU U-100 with the loss of all 26 crew.
 * SS Dart (1898) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 6 nmi south south west of the Ballycottin Lighthouse, County Cork by SMU UC-47 with the loss of four of her crew.
 * SS Hasting (1909) (🇸🇪 Sweden): World War I: The coaster was sunk in the Atlantic Ocean south of Ouessant, Finistère, France (48.3°N, -5.61667°W) by SMU UC-69.
 * SS Highbury (1912) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 100 nmi west south west of the Bishop Rock, Isles of Scilly (48.41667°N, -10.46667°W) by SMU U-82 with the loss of all 40 crew.
 * SS Kankakee ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea by a Luftstreitkräfte aircraft.
 * SS New Zealand Transport (1913) ( undefined): World War I: The collier was torpedoed and sunk in the Aegean Sea 8 nmi south east of Serphopulo Island, Greece by SMU UC-23 with the loss of three of her crew.
 * SS Nirefs (1915) (🇬🇷 Greece): World War I: The cargo ship struck a mine and sank in the Atlantic Ocea 1.5 nmi off the La Vielle Lighthouse, Ouessant.
 * SS Ortolan (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 100 nmi west south west of the Bishop Rock (48.15°N, -9.75°W) by SMU U-82 with the loss of three of her crew.
 * Perfect (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea east of the Shetland Islands (60.96667°N, 2.3°W) by SMU U-66 . Her crew survived.
 *  Vigoureuse (🇫🇷 France): World War I: The schooner was scuttled in the English Channel 20 nmi north of the Casquets, Channel Islands by SMU UB-32 . Her crew survived.
 * SS Wega (1885) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 20 nmi west by south of the Royal Sovereign Lightship ( undefined) by SMU UC-71 with the loss of five of her crew.

15 June

 * SS Addah (1905) ( undefined): World War I: The Elder Dempster 4,397 grt cargo/passenger ship was torpedoed and sunk in the Bay of Biscay 35 nmi south west of Penmarc'h, Finistère, France (47.4°N, -5°W) by SMU UC-69 with the loss of nine of her crew, whilst en route from Montreal to Cherbourg. The sinking is notable because when the submarine surfaced Oberleutnant zur See, Erwin Waßner ordered firing on the Captain's boat, hereby killing 8 men. The master's boat's stern was blown off, but the U-boat continued firing at the swimming men as their lifeboat was sinking. The Chief Officer's lifeboat was also targeted and again some men were wounded badly. When the U-boat finally disappeared, the Captain and others made it for the second lifeboat.
 *  Albertine Beatrice (🇳🇱 Netherlands): World War I: The barque was shelled and sunk in the Atlantic Ocean 200 nmi south west of the Fastnet Rock (48.03333°N, -10.95°W) by SMU U-82.
 * SS Assunzione (1889) ( undefined): World War I: The cargo ship struck a mine and sank in the Mediterranean Sea east of Bône, Algeria (37°N, 8°W). Her crew survived.
 * Clio (🇸🇪 Sweden): World War I: The sailing vessel struck a mine and sank in the Baltic Sea off Vaasa, Finland.
 * SS Espinho (1887) (🇵🇹 Portugal): World War I: The coaster was torpedoed, shelled and sunk in the Atlantic Ocean (37.56667°N, -9.1°W by SMU U-39 . Her crew survived.
 * Eugène et Eugènie (🇫🇷 France): World War I: The sailing vessel was scuttled in the Loire Estuary by SMU UC-48 . Her crew survived.
 * SS Kristianiafjord (1912) (🇳🇴 Norway): The passenger ship was wrecked off Cape Race, Newfoundland. All 1,144 passengers and crew were rescued.
 * USS Olympia (C-6) : The protected cruiser ran aground in Long Island Sound off Block Island. Her crew were taken off. She was later refloated, repaired and returned to service.
 * SS Pasha (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Strait of Messina (37.86667°N, 15.45°W) by SMU UC-38 with the loss of three of her crew.
 * SS Teesdale (1904) ( undefined): World War I: The cargo ship was damaged in the English Channel 2 nmi off Bolt Head, Devon by SMU UB-31 with the loss of three of her crew. She was later refloated.
 * HMT Towhee : The naval trawler sank in the English Channel.
 * SS Wapello (1912) ( undefined): World War I: The tanker was torpedoed and sunk in the English Channel 14 nmi west south west of the Owers Lightship ( undefined) (50.5°N, -0.95°W) by SMU UC-71 with the loss of two of her crew.
 * SS Westonby (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 195 nmi south west by south of the Fastnet Rock by SMU U-82 . Her crew survived.

16 June

 *  Carrie Hervey ( undefined): World War I: The schooner was shelled and sunk in the Atlantic Ocean 52 nmi south east by south of the Armen Rock (47.26667°N, -4.05°W) by SMU U-50 . Her crew survived.
 * Emsli (🇹🇳) Tunisia): World War I: The sailing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * Esperanza (🇪🇸 Spain): World War I: The sailing vessel was sunk in the Mediterranean Sea off Algiers, Algeria by SMU UC-53.
 * SS Fallodon (1903) ( undefined): World War I: The cargo ship was torpedoed and damaged in the Atlantic Ocean off Mine Head, County Cork by SMU U-61 . She was beached but was later refloated, repaired and returned to service.
 *  Inge (🇩🇰 Denmark): World War I: The three-masted schooner was scuttled in the North Sea 175 nmi off Hanstholm (56.35°N, 3.15°W) by SMU UB-22 . Her crew survived.
 * SS Jessie (1891) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 260 nmi west of the Bishop Rock, Isles of Scilly by SMU U-82 . Her crew survived.
 * SS John D. Archbold (1914) (🇺🇸 United States): World War I: The tanker was sunk in the Atlantic Ocean 85 nmi south west of Penmarc'h, Finistère, France (47.78333°N, -6.01667°W by SMU UC-48 with the loss of three of her crew.
 * Kamouma (🇹🇳 Tunisia): World War I: The sailing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * Kibira (🇹🇳) Tunisia): World War I: The sailing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 *  Kornsø (🇩🇰 Denmark): World War I: The auxiliary schooner was shelled and sunk in the Atlantic Ocean north west of the Orkney Islands, United Kingdom by SMU U-62 . Her crew survived.
 * La Tour d'Agon (🇫🇷 France): World War I: The sailing vessel was scuttled scuttled in the Bay of Biscay 35 nmi off the La Coubre Lighthouse by SMU UC-69.
 * Liberté (🇹🇳 Tunisia): World War I: The sailing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * Metlaoni (🇹🇳 Tunisia): World War I: The sailing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * SS Roald Amundsen (1891) (🇳🇴 Norway): World War I: The cargo ship struck a mine and was damaged in the North Sea 0.3 nmi west of the Tongue Lightship ( undefined) with the loss of three of her crew. She was beached but was later refloated, repaired and returned to service.

17 June

 * Aghios Georgios (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea 30 nmi west of Malta (35.61667°N, 13.81667°W) by SMU UC-22.
 * SS Anjou (1910) : World War I: The auxiliary minesweeper struck a mine and sank in the Adour at Bayonne, Pyrénées-Atlantiques (43.58333°N, -1.53333°W). Her crew survived.
 * SS Antonios M. Mavrogordatos (1901) (🇬🇷 Greece): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 7 nmi south of the Wolf Rock, Cornwall, United Kingdom (49.91667°N, -5.98333°W) by SMU UC-48.
 * Argentina ( undefined): World War I: The sailing vessel was sunk in the Gulf of Gabès off Djerba, Tunisia by SMU UC-27.
 * Bell Angelina ( undefined): World War I: The fishing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * SS Fornebo (1906) ( undefined): World War I: the tanker was torpedoed and sunk in the Atlantic Ocean 4 nmi north of Cape Wrath, Sutherland by SMU U-78 . Her crew survived.
 * HMT Fraser : World War I: The naval trawler struck a mine and sank in the English Channel off Boulogne, Pas-de-Calais, France with the loss of twelve of her crew.
 * Giuseppe S. ( undefined): World War I: The fishing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * SS Gunhild (1905) (🇩🇰 Denmark): World War I: The coaster was torpedoed and sunk in the Barents Sea 22 nmi off Holmengrå, Finnmark, Norway (60.75°N, 4.31667°W) by SMU U-100 with the loss of six of her crew.
 * SS Lizzie Westoll (1895) ( undefined): Wornd War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 120 nmi north west by west of the Fastnet Rock (51.65°N, -12.73333°W) by SMU UC-42 . Her crew survived.
 * Luigina ( undefined): World War I: The fishing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 *  Nostra Madre ( undefined): World War I: The barque was shelled and sunk in the Atlantic Ocean 70 nmi east of the Fastnet Rock by SMU U-60.
 * SS Raloo (1898) ( undefined): World War I: The cargo ship was torpedoed and sunk in St. George's Channel 6 nmi south east by east of the Coningbeg Lightship ( undefined) by SMU U-61 with the loss of three crew.
 * San Antonio V ( undefined): World War I: The fishing vessel was sunk in the Gulf of Gabès by SMU UC-27.
 * SS Stanhope (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 7 nmi south west by west of Start Point, Devon (50.13333°N, -3.75°W) by SMU UB-31 with the loss of 22 of her crew.
 * HMS Tartar (1907) : World War I: The Tribal-class destroyer struck a mine and was damaged in the English Channel off Boulogne with the loss of 45 of her crew.
 * SS Tosto (1904) (🇳🇴 Norway): World War I: The cargo ship struck a mine and sank off Noup Head, Westray, Orkney Islands, United Kingdom. Her crew survived.

18 June

 * HMT Bega : World War I: The naval trawler was torpedoed and sunk in the Atlantic Ocean 40 nmi north of Muckle Flugga, Shetland Islands (61.6°N, -0.58333°W) by SMU U-58 with the loss of seven crew.
 *  Bettina ( undefined): World War I: The brigantine was sunk in the Gulf of Gabès off Sfax, Tunisia (35.28333°N, 11.16667°W) by SMU UC-27.
 *  Bianca B ( undefined): World War I: The brig was sunk in the Gulf of Gabès off Sfax (35.3°N, 11.31667°W) by SMU UC-27.
 * HMT Borneo : World War I: The naval trawler struck a mine and sank in the English Channel off Beachy Head, East Sussex (50.66667°N, 0.2°W) with the loss of eleven of her crew.
 * SS Dorte Jensen (1901) (🇩🇰 Denmark): World War I: The cargo ship struck a mine and sank in the North Sea off the Tongue Lightship ( undefined) (51.48333°N, 1.38333°W). Her crew survived.
 * SS Elele ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 300 nmi west north west of the Fastnet Rock (52.33333°N, 17.5°W) by SMU U-24 . Her crew survived.
 * SS English Monarch (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 300 nmi west north west of the Fastnet Rock (52.33333°N, 17.5°W) by SMU U-24  with the loss of three crew.
 * Gauntlet ( undefined): World War I: The ketch was scuttled in the English Channel 30 nmi north west of the Les Hanois Lighthouse, Guernsey, Channel Islands by SMU UC-65 . Her crew survived.
 * Kangaroo ( undefined): World War I: The schooner was shelled and sunk in the Atlantic Ocean 20 nmi south of the Tuskar Rock, Ireland (51.88333°N, -6.4°W) by SMU UC-51 with the loss of four of her crew.
 * Letizia C. ( undefined): World War I: The sailing vessel was sunk in the Gulf of Gabès off Sfax by SMU UC-27.
 * Marietta B. ( undefined): World War I: The sailing vesseld was sunk in the Gulf of Gabès off Sfax by SMU UC-27.
 * Pannomitis (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea by SMU UC-23.
 * Paolina Aida ( undefined): World War I: The sailing vessel was sunk in the Gulf of Gabès off Sfax (35.28333°N, 11.16667°W) by SMU UC-27.
 * SS Queen Adelaide (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 13 nmi north north east of St. Kilda, Inverness-shire (58.06667°N, -8.58333°W) by SMU U-70 with the loss of three crew.
 *  R. C. Slade (🇺🇸 United States): The schooner was scuttled in the Pacific Ocean by SMS Seeadler (auxiliary cruiser).
 * SS Seaconnet (1911) (🇺🇸 United States): World War I: The cargo ship struck a mine and sank in the North Sea 10 nmi east of Scroby Sands, Norfolk (52.43333°N, 2°W). Her crew survived.
 * SS Thistledhu (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 218 nmi north west of the Fastnet Rock by SMU U-82 with the loss of four of her crew.
 * SS Tyne (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 18 nmi south west of The Lizard, Cornwall (49.7°N, -5.41667°W) by SMU UC-48 . Her crew survived.
 * SS Vaering (1888) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the English Channel 14 nmi north of the Stiff Lighthouse, Ouessant, Finistère, France by SMU UC-65 with the loss of a crew member.
 *  Violet ( undefined): World War I: The barquentine was shelled and sunk in the Irish Sea 10 nmi south south east of the Coningbeg Lightship ( undefined) (51.95°N, -6.4°W) by SMU UC-51 . Her crew survived.
 * SS Xiphias (1873) (🇬🇷 Greece): World War I: The passenger ship was sunk in the Aegean Sea off Mykonos by SMU UC-23.

19 June

 * Amalia ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * Antonio Balbi ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * FRENCH SUBMARINE Ariane : World War I: The Amphitrite-class submarine was torpedoed and sunk in the Mediterranean Sea off Bizerta, Algeria by SMU UC-22.
 * SS Batoum (1893) ( undefined): World War I: The tanker was torpedoed and sunk in the Atlantic Ocean 6 nmi south of the Fastnet Rock by SMU U-61 . with the loss of a crew member.
 * SS Bearn (1894) (🇫🇷 France): World War I: The cargo ship was sunk in the Bay of Biscay 8 nmi north of Tapia de Casariego, Asturias, Spain by SMU UC-69 . Her crew survived.
 * SS Brookby (1905) ( undefined): World War I: The cargo ship was scuttled in the Atlantic Ocean 155 nmi south of the Fastnet Rock by SMU U-60 . Her crew survived.
 * SS Buffalo (1907) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 80 nmi north west by north of Cape Wrath, Sutherland (59.56667°N, -7.5°W) by SMU U-70 . Her crew survived.
 * HM CMB-1 : World War I: The Coastal Motor Boat was shelled and sunk in the North Sea off Zeebrugge, West Flanders, Belgium by a Kaiserliche Marine destroyer with the loss of a crew member. Survivors were taken as prisoners of war.
 * Domenico Madre ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 *  Ivigtut (🇩🇰 Denmark): World War I: The auxiliary barque was sunk in the North Sea north east of the Shetland Islands, United Kingdom (61.78333°N, -0.05°W) by SMU U-58 . Her crew survived.
 * Jakobus (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea by SMU UC-23.
 *  Kate and Anne ( undefined): World War I: The ketch was scuttled in the English Channel 25 nmi north west by west of the Les Hanois Lighthouse, Guernsey, Channel Islands by SMU UC-17 . Her crew survived.
 * SS Kelso (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 33 nmi west south west of the Bishop Rock, Isles of Scilly by SMU UC-75 . Her crew survived.
 * SS Kyma (1898) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Atlantic Ocean off the coast of Morocco (34.56667°N, -6.7°W) by SMU U-39 . Her crew survived.
 * La Giuseppina ( undefined): World War I: The sailing vessel was sunk in the Strait of Sicily by SMU U-64 (Germany).
 * La Michelina ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 *  Louise (🇳🇴 Norway): World War I: The barque was sunk in the North Sea 135 nmi east north east of Hook Point, Hartlepool, County Durham, United Kingdom (56.23333°N, 2.48333°W) by SMU U-93 . Her crew survived.
 * Maria (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea by SMU UC-23.
 * Mistica Rosa ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * Nuovo Mondo Carmelo ( undefined): World War I: The sailing vessel was sunk in the Strait of Sicily by SMU U-64 (Germany).
 * Raffaelo ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * Raxiarchos (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea by SMU UC-23.
 * Rosinella ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * San Antonio ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * San Giovanni Batista ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27 . Her crew survived.
 * SS Spind (1877) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Bay of Biscay 2 nmi west by south of Cape Busto, Spain by SMU UC-69 . Her crew survived.
 * S. Vincenzo Ferrari P. ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Pantelleria by SMU UC-27.
 * SS Tunisie (1907) (🇫🇷 France): World War I: The cargo ship was sunk in the Atlantic Ocean west of Ireland (52.16667°N, -16°W by SMU U-43 (Germany) with the loss of all 31 crew.

20 June

 * FRENCH SUBMARINE Ariane : World War I: The submarine was sunk in the Mediterranean Sea off Cap Bon, Tunisia by SMU UC-22.
 * SS Bengore Head (1884) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 150 nmi north west of the Fastnet Rock (52.31667°N, -13.65°W) by SMU U-62 . Her crew survived.
 *  Benita ( undefined): World War I: The schooner was shelled and sunk in the English Channel 15 nmi south of Portland Bill, Dorset by SMU UC-75 . Her crew survived.
 * Bidartaise (🇫🇷 France): World War I: The vessel was sunk in the English Channel 15 nmi south of Portland Bill by SMU UC-75.
 * SS Eli Lindoe (1916) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean off the coast of Morocco by SMU U-39 . Her crew survived.
 *  Fido (🇳🇴 Norway): World War I: The barque was captured and scuttled in the North Sea south south west of Utsire, Rogaland by SMU U-19 (Germany) . Her crew survived.
 * USS Gypsy (SP-55) : The patrol boat was destroyed by fire at Boston, Massachusetts whilst under conversion for navy use.
 * SS Katerina (1898) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Bay of Biscay (43.8°N, -7.71667°W) by SMU UC-69.
 * SS Ruperra (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 50 nmi east by south of Pantelleria, Italy by SMU UC-27 . Her crew survived.
 * HMS Salvia (1916) : World War I: The Aubretia-class sloop, operating as a Q-ship, was sunk in the Atlantic Ocean west of Ireland (52.41667°N, -16.33333°W) by SMU U-94 with the loss of five of her crew. Her captain was taken as a prisoner of war.

21 June

 * SS Black Head (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 52 nmi east south east of the Out Skerries, Shetland Islands (60.36667°N, 1°W) by SMU U-19 (Germany) . Her crew survived.
 *  Childe Harold (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean off Ouessant, Finistère, France (47.83333°N, -7.83333°W) by SMU UC-17 . Her crew survived.
 * SS E. T. Nygaard (1916) (🇩🇰 Denmark): World War I: The cargo ship was scuttled in the Atlantic Ocean 2 nmi off Cape Ortegal, Portugal (43.73333°N, -8.03333°W) by SMU UC-69 . Her crew survived.
 * Hendrika (🇳🇱 Netherlands): World War I: The fishing vessel was sunk in the North Sea off Callantsoog, North Holland by SMU UC-64 . Her crew survived.
 * SS Laatefos (1913) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the North Sea west of Lerwick, Shetland by SMU U-19 (Germany) . Her crew survived.
 * SS Lord Roberts (1901) ( undefined): World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 270 nmi north west by north of the Fastnet Rock (51.63333°N, -15.96667°W) by SMU U-62 . Her crew survived.
 * SS Ortona (1916) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 140 nmi south west of the Fastnet Rock by SMU U-50 with the loss of a crew member.
 * SS Scheria (1902) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 140 nmi west south west of Ouessant by SMU UC-17.

22 June

 * SS Bolette (1910) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 95 nmi west of Feie by SMU U-19 (Germany) with the loss of five of her crew.
 * HSWMS Claes Uggla : The cruiser ran aground and sank.
 * SS Himalaya (1902) (🇫🇷 France): World War I: The passenger ship was sunk in the Mediterranean Sea 38.05°N, 11.51667°W) by SMU U-63 (Germany) with the loss of 28 of the 204 people on board.
 * SS Maggie (1915) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 70 nmi north west of Ireland by SMU U-79 . Her crew survived.
 * SS Melford Hall (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 95 nmi west of Tory Island, County Donegal (56.56667°N, -10.68333°W) by SMU U-100 . Her crew survived.
 * SS Miami (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 11 nmi east south east of the Fastnet Rock (51.35°N, -9.31667°W) by SMU UC-51 . Her crew survived.
 * SS Toro (1905) (🇺🇾 Uruguay): World War I: The cargo ship was sunk in the Atlantic Ocean off the coast of Morocco (35.63333°N, -7.43333°W) by SMU U-39.

23 June

 * HMT Corientes : World War I: The naval trawler struck a mine and sank in the Atlantic Ocean 4 nmi north east of Malin Head, County Donegal (55.45°N, -7.4°W) with the loss of thirteen crew.
 * SS Craonne (1871) (🇫🇷 France): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea south west of Sicily, Italy (38.1°N, 5.81667°W) by SMU U-63 (Germany) with the loss of a crew member.
 * SS Isère (1887) (🇫🇷 France): World War I: The cargo ship was sunk in the Atlantic Ocean 70 nmi west of Cape Spartel, Morocco (35.6°N, -6.96667°W) by SMU U-39 . Her crew survived.
 * Jules (🇫🇷 France): World War I: The sailing vessel struck a mine and sank in the Gulf of Gabès off Sfax, Tunisa.
 * SS Kalypso Vergotti (1901) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 70 nmi north west of Cape Bougaroni, Algeria (37.91667°N, 5.35°W) by SMU U-63 (Germany).
 * SS Mongolia (Caird, 1903) ( undefined): World War I: The passenger ship struck a mine and sank in the Indian Ocean off Bombay, India with the loss of fourteen lives.
 *  Sophie (🇩🇰 Denmark): World War I: The three-masted schooner was sunk in the Atlantic Ocean north of the Shetland Islands, United Kingdom by SMU U-55 . Her crew survived.
 *  Star (🇩🇰 Denmark): World War I: The three-masted schooner was sunk in the Atlantic Ocean north of the Shetland Islands by SMU U-55 . Her crew survived.

24 June

 * SS Aghia Paraskevi (1890) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 23 nmi off Cap Ferrat, Alpes-Maritimes, France by SMU UC-65.
 * SS Cabo Verde (1883) (🇵🇹 Portugal): World War I: The cargo ship was sunk in the Atlantic Ocean off Cape Vilano, Spain by SMU UC-69 . Her crew survived.
 * SS Cestrian (1896) ( undefined): World War I: The troopship was torpedoed and sunk in the Aegean Sea 4 nmi south east of Skyros, Greece by SMU UB-42 with the loss of three lives.
 * SS Clan Davidson (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 130 nmi south west by west of the Isles of Scilly (48.26667°N, -8.6°W) by SMU UC-17 with the loss of twelve of her crew.
 * SS Constantinos (1893) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 25 nmi off Cap Ferrat by SMU UC-65 . Her crew survived.
 * SS Crown of Arragon (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 124 nmi south west of the Isles of Scilly (48.16667°N, -8.23333°W) by SMU UC-17  with the loss of a crew member.
 * SS Helma (1911) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 110 nmi north of Cape Vilano, Spain (45.78333°N, -9.91667°W) by SMU UC-69 . Her crew survived.
 * SS Hilversum (1883) (🇳🇱 Netherlands): World War I: The cargo ship was torpedoed and sunk in the Bristol Channel 4.5 nmi south south west of Lundy Island, Devon, United Kingdom by SMU UC-51 . Her crew survived.
 * HMS Kempton : The Racecourse-class minesweeper struck a mine and sank in the North Sea off Gravelines, Pas-de-Calais, France (51.05°N, 2.11667°W) with the loss of three of her crew.
 * SS Kong Haakon (1889) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Mediterranean Sea 23 nmi off Cap Ferrat by SMU UC-65 with the loss of nineteen of her crew.
 * HMS Redcar : World War I: The Racecourse-class minesweeper struck a mine and sank in the North Sea off Gravelines (51.05833°N, 2.12778°W) with the loss of seven of her crew.
 * SS South Wales (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 128 nmi west of the Bishop Rock, Isles of Scilly by SMU U-62 with the loss of two crew.
 * SS Sylvanian (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 170 nmi north west of Tory Island, County Donegal by SMU U-94 with the loss of two of her crew.
 * SS Taigetos (1903) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 25 nmi off Cap Ferrat by SMU UC-65 . Her crew survived.
 * HMT Taipo : World War I: The naval trawler struck a mine and sank in the English Channel off Beachy Head, East Sussex (50.69167°N, 0.31667°W) with the loss of five of her crew.
 * SS Telegraaf XVIII (🇳🇱 Netherlands): World War I: The coaster was sunk in the North Sea west south west of Hoek van Holland, South Holland (52.3°N, 3.16667°W) by SMU UC-64.

25 June

 * SS Anatolia (1898) ( undefined): World War I: The cargo ship struck a mine and sank in the Gulf of Genoa 1.5 nmi off Genoa, Liguria, Italy. Her crew survived.
 *  Galena (🇺🇸 United States): World War I: The schooner barge was scuttled in the Atlantic Ocean 70 nmi west by south of Ouessant, Finistère, France by SMU UC-17 . Her crew survived.
 * HMS Gelsina : World War I: The naval trawler struck a mine and sank in the North Sea off Aberdeen (57.11667°N, -1.96667°W) with the loss of five of her crew.
 * SS Guildhall (1898) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 40 nmi south west by west of the Bishop Rock, Isles of Scilly by SMU U-62 with the loss of twelve crew.
 * SS Petritzis (1905) (🇬🇷 Greece): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay south west of Contis, Landes, France (43.41667°N, -1.5°W) by SMU UC-65.
 * SS Saxon Monarch (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 140 nmi south west by west of the Isles of Scilly (48.4°N, -7.78333°W) by SMU UC-17 . Her crew survived.
 * SS Southern (1916) ( undefined): World War I: The cargo ship struck a mine 4 nmi north east of Port-la-Nouvelle, Aude, France and was beached. She was later refloated, repaired and returned to service.

26 June

 * SS Birdoswald (1892) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 25 nmi east of Tarragona, Catalonia, Spain (41.11667°N, 1.85°W) by SMU U-63 (Germany) . Her crew survived, but two of them were taken as prisoners of war.
 * SS Cattaro (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 130 nmi west south west of the Bishop Rock, Isles of Scilly (48.83333°N, -7.78333°W) by SMU U-62 . Her crew survived.
 * HMT Charles Astie : World War I: The naval trawler struck a mine and sank in Lough Swilly with the loss of all seventeen crew.
 * SMS G96 : World War I: The G96-class destroyer struck a mine and sank in the North Sea off the coast of Belgium with the loss of four of her crew.
 * Georg ( undefined): World War I: The sailing vessel was sunk in the Baltic Sea off Rauma, Finland by SMU UC-57.
 * SS Haverford (1901) ( undefined): World War I: The passenger ship was torpedoed and damaged in the Atlantic Ocean (57.01667°N, -10.98333°W) by SMU U-94 with the loss of eight of her crew. She was beached at Kinnegar, County Donegal but was later refloated.
 * SS Manistee (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 86 nmi west south west of the Bishop Rock (48.95°N, -8.13333°W) by SMU U-62 ( with the loss of five crew.
 * Marie ( undefined): World War I: The barge was sunk in the Baltic Sea off Rauma by SMU UC-57.
 * ST Martiniemi ( undefined): World War I: The tug was sunk in the Baltic Sea off Rauma by SMU UC-57.
 * SS Serapis (1877) ( undefined): World War I: The cagro ship was torpedoed and sunk in the Atlantic Ocean 106 nmi north north west of Tory Island, County Donegal (56.33333°N, -10.75°W) by SMU U-79 with the loss of nineteen of her 22 crew. Two of the survivors were taken as prisoners of war.
 * Tervo ( undefined): World War I: The barge was sunk in the Baltic Sea off Rauma by SMU UC-57.
 *  Vonin (🇩🇰 Denmark): World War I: The schooner was set afire in the Atlantic Ocean west of the Hebrides, United Kingdom by SMU U-50 . She was later towed to Londonderry but was declared a constructive total loss. Her crew survived.

27 June

 * SS Armadale (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 160 nmi north west of Tory Island, County Donegal (56.28333°N, -12.7°W) by SMU U-60 with the loss of three crew.
 * Baltic (🇸🇪 Sweden): World War I: The auxiliary barge was sunk in the Arctic Sea 75 nmi west of Holmengrå, Finnmark, Norway by SMU U-21 (Germany) d.
 * SS Baron Ogilvy (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 172 nmi north west of Tory Island by SMU U-93 with the loss of two of her crew.
 * GREEK DESTROYER Doxa : World War I: The Niki-class destroyer was torpedoed and sunk in the Aegean Sea off Milos by SMU UB-47.
 * FRENCH CRUISER Kléber : World War I: The Dupleix-class cruiser struck a mine and sank in the Bay of Biscay off Brest, Finistère with the loss of 42 of her crew.
 * SS Indrani ( undefined): The cargo ship was torpedoed and sunk in the Atlantic Ocean 36 nmi south west of the Tuskar Rock, Ireland by a Kaiserliche Marine submarine.
 * SS Longbenton (1898) ( undefined) World War I: The collier was torpedoed and sunk in the North Sea 12 nmi off Flamborough Head, Yorkshire (53.91667°N, -0.05°W) by SMU UC-63 . Her crew survived.
 * SS Solway Prince (1890) ( undefined): World War I: The coaster was scuttled in the English Channel 8 nmi north of Alderney, Channel Islands by SMU UB-40 . Her crew survived.
 * SS Tong Hong (1891) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea 55 nmi south by west of Cape Sicie, Var, France (42.15°N, 5.66667°W) by SMU U-63 (Germany) . Her crew survived, but her captain was taken as a prisoner of war. The rest of the survivors were rescued by FRENCH TRAWLER Vega.
 * SS Ultonia (1898) ( undefined): World War I: The cargo liner was torpedoed and sunk in the Atlantic Ocean 190 nmi south west of the Fastnet Rock by SMU U-53 with the loss of a crew member.

28 June

 * Corona ( undefined): World War I: The fishing vessel was shelled and sunk in the North Sea 65 nmi east of Sumburgh Head, Shetland Islands by SMU UC-33 . Her crew survived.
 * SS Don Arturo (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 90 nmi west south west of the Isles of Scilly by SMU UC-62 with the loss of all 34 crew.
 * Elsie ( undefined): World War I: The fishing vessel was scuttled in the North Sea 10 nmi north east of Spurn Point, Yorkshire by SMU UC-63 . Her crew survived.
 * Frances ( undefined): World War I: The fishing vessel was scuttled in the North Sea 10 nmi north east of Spurn Point by SMU UC-63 . Her crew survived.
 * Frigate Bird ( undefined): World War I: The fishing vessel was sunk in the North Sea 10 nmi north east of Spurn Point by SMU UC-63 with the loss of all five crew.
 * Glenelg ( undefined): World War I: The fishing vessel was scuttled in the North Sea north east of Spurn Point (53.93333°N, 1.06667°W) by SMU UC-63.
 * Harbinger ( undefined): World War I: The fishing schooner was scuttled in the North Sea off Spurn Point by SMU UC-63 . Her crew survived.
 *  Lizzie Ellen ( undefined): World War I: The schooner was scuttled in the English Channel 46 nmi south of Start Point, Devon (49.48333°N, -3.31667°W) by SMU UC-65 . Her crew survived.
 * SS Marguerite (1912) (🇫🇷 France): World War I: The cargo ship was torpedoed in the English Channel 19 nmi south west of Portland Bill, Dorset, United Kingdom (50.60167°N, -2.9775°W) by SMU UB-40.
 * SS Marne (1917) (🇫🇷 France): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay 5 nmi off the Île d'Yeu, Vendée (46.98333°N, -2.48333°W) by SMU UC-71 with the loss of twelve of her 40 crew. Survivors were rescued by FRENCH TRAWLER Sauterelle.
 * SS Minerve (1875) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea 20 nmi north of Cape Sigli, Algeria (37.46667°N, 4.71667°W) by SMU U-34 (Germany).
 *  Neotsfield ( undefined): World War I: The full-rigged ship was scuttled in the Atlantic Ocean 112 nmi south west by west of the Bishop Rock, Isles of Scilly (48.46667°N, -8.31667°W) by SMU UC-62 . Her crew survived.
 * Rose of June ( undefined): World War I: The fishing vessel was scuttled in the North Sea 10 nmi off Spurn Point by SMU UC-63 . Her crew survived.
 * William and Betsy ( undefined): World War I: The fishing vessel was scuttled in the North Sea 10 nmi north east of Spurn Point by SMU UC-63 . Her crew survived.

29 June

 * HMS Bayard : The Q-ship was lost on this date.
 * SS Driskos (1891) (🇬🇷 Greece): World War I: Convoy 430: The cargo ship was shelled and sunk in the Bay of Biscay 5 nmi south west of the Île de Noirmoutier, Vendée, France (46.91667°N, -2.51667°W) by SMU UC-71 with the loss of a crew member.
 * SS Escondido (1912) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 20 nmi north north west of St. Kilda, Inverness-shire, United Kingdom by SMU U-88 . Her crew survived.
 * Gem ( undefined): World War I: The fishing vessel was shelled and sunk in the North Sea 18 nmi east by south of Rattray Head, Aberdeenshire by SMU UC-33 . Her crew survived.
 * ST Lauwerzee (🇳🇱 Netherlands): World War I: The trawler was shelled and sunk in the North Sea off Hoek van Holland, South Holland by SMU UC-21 . Her seven crew took to the lifeboats but were not rescued.
 * Manx Princess ( undefined): World War I: The fishing vessel was shelled and sunk in the North Sea 18 nmi east by south of Rattray Head by SMU UC-33 . Her crew survived.

30 June

 * Alkelda ( undefined): World War I: The yacht was sunk in the Ligurian Sea by SMU U-63 (Germany).
 *  Asalia (🇳🇴 Norway): World War I: The four-masted barque was damaged in the Western Approaches (51°N, -13.83333°W) by SMU UC-44 . She sank the next day; her crew survived.
 * SS Benguela (1897) (🇳🇴 Norway): World War I: The cargo ship, which had been captured on 14 June, was sunk in the Atlantic Ocean off Punta Delgada, Canary Islands, Spain (40.36667°N, -26.08333°W) by SMU U-155.
 * SS Borgund I (1883) (🇳🇴 Norway): World War I: The coaster was sunk in the English Channel off Dartmouth, Devon, United Kingdom (50.55°N, -2.55°W) by SMU UB-40 . Her crew survived.
 * Bröderna (🇸🇪 Sweden): World War I: The fishing vessel was sunk in the North Sea north east of the Shetland Islands, United Kingdom by SMU U-79.
 * SS Caledonien (1882) (🇫🇷 France): World War I: The passenger ship struck a mine and sank in the Mediterranean Sea 30 nmi north of Port Said, Egypt (31.75°N, 32.38333°W).
 * SS Château Yquem (1914) (🇫🇷 France): World War I: The cargo ship was sunk in the English Channel 22 nmi west of Portland Bill, Dorset, United Kingdom by SMU UB-40.
 * HMS Cheerful (1897) : World War I: The Mermaid-class destroyer struck a mine and sank in the Atlantic Ocean off the Shetland Islands (60.03333°N, -1.11667°W) with the loss of 40 of her 62 crew.
 * Concettina ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea east of Sicily by SMU UB-47.
 * SS Enrichetta (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Gulf of Genoa (44.2°N, 9.38333°W) by SMU U-63 (Germany) with the loss of a crew member.
 * SS Germania (1908) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea 40 nmi east of the Orkney Islands, United Kingdom (59°N, -1.16667°W) by SMU UC-33.
 * SS Haigh Hall (1908) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 40 nmi east of Malta (36.2°N, 15.4°W) by SMU U-28 (Austria-Hungary) . Her crew survived.
 * Il Nuovo Gasperino Gabriele ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea south west of Marsala, Sicily by SMU UC-67.
 * SS Ilston (1915) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 4 nmi south east of The Lizard, Cornwall (49.93333°N, -5.11667°W) by SMU UB-23 with the loss of six of her crew.
 * Lady of the Lake ( undefined): World War I: The ketch was scuttled in the Atlantic Ocean 25 nmi south east by east of Mine Head, County Cork by SMU UC-30 . Her crew survived.
 * Lancaster (🇸🇪 Sweden): World War I: The fishing vessel was sunk in the North Sea north east of the Shetland Islands by SMU U-79.
 * RUSSIAN DESTROYER Leytenant Zatsarenni : World War I: The destroyer struck a mine and sank in the Black Sea off the mouth of the Danube.
 * SS Markersdal (1907) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the North Sea 12 nmi south of Flamborough Head, Yorkshire, United Kingdom by SMU UC-63 . Her crew survived.
 * SS Mont Viso (1912) (🇫🇷 France): World War I: The troopship was sunk in the Mediterranean Sea off Gourraya, Algeria (36.65°N, 1.91667°W) by SMU U-34 (Germany).
 * SS Phoebus (1894) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea off Castletown, Isle of Man by SMU UC-44 . Her crew survived.
 * Preceptor (🇸🇪 Sweden): World War I: The fishing vessel was sunk in the North Sea north east of the Shetland Islands (61.7°N, 1.28333°W) by SMU U-79.
 * Sacra Famiglia ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea east of Sicily by SMU UB-47.
 *  Siraa (🇳🇴 Norway): World War I: The full-rigged ship was sunk in the Atlantic Ocean off Punta Delgada, Canary Islands (40.36667°N, -26.85°W) by SMU U-155 . Her crew survived.

Unknown date

 * SS Keeper ( undefined): World War I: The coaster was sunk in the Irish Sea by a Kaiserliche Marine submarine with the loss of ten of her crew.
 * SS Toro (🇦🇷 Argentina): World War I: The cargo ship was sunk in the Strait of Gibraltar by enemy action in the week ending 26 June.