List of shipwrecks in June 1918

The list of shipwrecks in June 1918 includes ships sunk, foundered, grounded, or otherwise lost during June 1918.

1 June

 * SS Angelina (1870) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea west of Cape Granitola (approximately 37°N, 12°W) by SMU UB-68.
 * Egret ( undefined): World War I: The trawler was torpedoed and sunk in the North Sea 2 nmi east by north of the Humber Lightship by a Kaiserliche Marine submarine with the loss of eleven of her crew.

2 June

 * Argus (🇩🇰 Denmark): World War I: The sailing vessel was sunk in the Atlantic Ocean 80 nmi west by north of Loop Head, County Clare (52.45°N, -11.48333°W) by SMU U-97 . Her crew survived.
 * SS Carolina (🇺🇸 United States): World War I: The passenger ship was shelled and sunk in the Atlantic Ocean 65 nmi east of Atlantic City, New Jersey by SMU U-151 with the loss of thirteen lives. Survivors were rescued by SS Appleby ( undefined), SS Bryssel (🇩🇰 Denmark) and   Eva B. Douglas (🇺🇸 United States) or reached the shore in their lifeboat.
 * Edward H. Cole (🇺🇸 United States): World War I: The sailing vessel was shelled and sunk in the Atlantic Ocean 50 nmi east by south of the Barnegat Lighthouse, New Jersey by SMU U-151 . Her crew survived.
 *  Isabel B. Wiley (🇺🇸 United States): World War I: The three-masted schooner was scuttled in the Atlantic Ocean off the Barnegat Lighthouse by SMU U-151 . Her crew survived.
 * Jacob M. Haskell (🇺🇸 United States): World War I: The sailing vessel was sunk in the Atlantic Ocean 50 nmi east by south of the Barnegat Lighthouse by SMU U-151 . Her crew survived.
 * SS Texel (1913) (🇺🇸 United States): World War I: The cargo ship was sunk in the Atlantic Ocean 60 nmi south of New York (38.95°N, -73.21667°W) by SMU U-151 . Her crew survived.
 * SS Winneconne (1907) (🇺🇸 United States): World War I: The cargo ship was sunk in the Atlantic Ocean (39.43333°N, -72.83333°W) by SMU U-151 . Her crew survived.

3 June

 * SS Glaucus (1896) ( undefined):World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 20 nmi west of Cape Granitola, Italy (37.55°N, 12.25°W) by SMU UB-68 with the loss of two of her crew.
 * SS Mecanicien Donzel (🇫🇷 France): World War I: The cargo ship, on her maiden voyage, was torpedoed and sunk in the Mediterranean Sea 68 nmi north west of Cape Argentira (40.75°N, 6.98333°W) by SMU UB-49 . Her crew were rescued by FRENCH TRAWLER Marguerite-Marie.
 * SS Nora (1908) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 205 nmi south east of Malta (33.63333°N, 17.7°W) by SMU UB-105 with the loss of a crew member.
 *  Samuel C. Mengel (🇺🇸 United States): World War I: The four-masted schooner was scuttled in the Atlantic Ocean (38.11667°N, -73.76667°W) by SMU U-151 . Her crew survived.
 *  Sant' Antonio ( undefined): World War I: The brig was scuttled in the Mediterranean Sea 82 nmi south of Santa Maria di Leuca, Lecce (37.91667°N, 19°W) by SMU UB-48.
 * HMT St. John's : World War I: The naval trawler was shelled and sunk in the Atlantic Ocean 45 nmi north of Tory Island, County Donegal (55.91667°N, -8.25°W) by SMU U-101 with the loss of four of her crew. Three survivors were taken as prisoners of war.

4 June

 * SS Eidsvold (1902) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean (37.2°N, -73.91667°W) by SMU U-151 . Her crew survived.
 * SMS T68 : World War I: The struck a mine and sank in the North Sea with the loss of seven of her crew.

5 June

 * Anton (🇸🇪 Sweden): World War I: The sailing vessel was sunk in the North Sea 24 nmi west south west of the Lindesnes Lighthouse, Norway by SMU U-80 . Her crew survived.
 * SS Argonaut (1893) (🇺🇸 United States): World War I: The cargo ship was sunk in the Western Approaches (49.2°N, -6.75°W) by SMU U-82 . Her crew survived.
 * SS Harpathian (1913) ( undefined): World War I: The cargo ship was torpeoded and sunk in the Atlantic Ocean 80 nmi off Cape Henry, Virginia by SMU U-151 . Her crew survived.
 * SS Polwell (1888) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 3 nmi north east of Lambay Island, County Dublin (53.55°N, -5.91667°W) by SMU U-96 . Her crew survived.
 * HMS Snaefell : World War I: The armed boarding steamer was torpedoed and sunk in the Mediterranean Sea 240 nmi east south east of Malta by SMU UB-105 . Her crew survived.
 * SS Vinland (1906) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 50 nmi off Cape Henry (36.53333°N, -73.96667°W) by SMU U-151 . Her crew survived.

6 June

 * Active ( undefined): World War I: The fishing ketch was shelled and sunk in the North Sea off the coast of Norfolk by SMU UB-40 . Her crew survived.
 * SS Archbank (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 240 nmi east south east of Malta by SMU UB-105 with the loss of a crew member.
 * Beryl ( undefined): World War I: The fishing smack was scuttled in the North Sea off the coast of Norfolk by SMU UB-40 . Her crew survived.
 *  Christophero Colombo ( undefined): World War I: The schooner was scuttled in the Strait of Messina (37.15°N, 11.41667°W) by SMU UB-48.
 * Dianthus ( undefined): World War I: The fishing smack was scuttled in the North Sea off the coast of Norfolk by SMU UB-40 . Her crew survived.
 * SS Huntsland (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 23 nmi north by west of Le Havre, Seine-Maritime, France (49.83333°N, -0.16667°W) by SMU UC-77 . Her crew survived.
 * SS Menzaleh (1888) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 240 nmi east south east of Malta by SMU UB-105 . Her crew survived, but her captain was taken as a prisoner of war.
 * SS Koningin Regentes (1895) (🇳🇱 Netherlands): World War I: The passenger ship was torpedoed and sunk in the North Sea 21 nmi east of the Leman Lightship ( undefined) by SMU UB-107.

7 June

 * SS Axpe Mendi (1897) (🇪🇸 Spain): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay 60 nmi off Brest, Finistère, France by SMU UB-80 . Her crew survived.
 * SS Brisk (1906) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 13 nmi north west of Trevose Head, Cornwall, United Kingdom (50.76667°N, -5.81667°W) by SMU U-82 . Her crew survived.
 * SS Diana (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 10 nmi south south east of Flamborough Head, Yorkshire by SMU UB-108 . Her crew survived.

8 June

 * SS Concettina (1888) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea east of Sicily by SMU UC-53 . Her crew survived.
 * Elektra (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea 16 nmi south east of the Ryvingen Lightship (🇳🇴 Norway) by SMU UB-64 . Her crew survived.
 * Eros ( undefined: World War I: The trawler struck a mine and sank in the North Sea 36 nmi east north east of Spurn Point, Yorkshire with the loss of six of her crew.
 * SS Hogarth (1893) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea off Sunderland, County Durham (54.85°N, -1.05°W) by SMU UB-107 with the loss of 26 of her crew.
 * SS Hunsgrove (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 6.5 nmi north west of Trevose Head, Cornwall (50.6°N, -5.18333°W) by SMU U-82 with the loss of three of her crew.
 * SS La Bayonnaise (1911) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea 21 nmi south east of Cape Spartivento, Italy (37.91667°N, 16.56667°W) by SMU UC-53.
 * SS Pinar del Rio (1895) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean (36.25°N, -73.91667°W) by SMU U-151 . Her crew survived.
 * SS Saima (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 10 nmi west of Trevose Head (50.48333°N, -5.38333°W) by SMU U-82 with the loss of sixteen of her crew.

9 June

 * SS Clan Forbes (1903) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 115 nmi west north west of Alexandria, Egypt (31.91667°N, 27.83333°W) by SMU UB-105 with the loss of two of her crew.
 * Helene (🇳🇱 Netherlands): World War I: The fishing vessel was shelled and sunk in the North Sea (55.63333°N, 2.91667°W) by SMU U-100 with the loss of three of her crew.
 * SS Moidart (1878) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 7 nmi south east of Lyme Regis], Dorset by SMU UC-77 with the loss of fifteen of her crew.
 * SS Pundit (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 85 nmi west north west of Alexandria by SMU UB-105 with the loss of six of her crew.
 * Queen Victoria ( undefined): World War I: The sailing vessel was scuttled in the Bristol Channel 6 nmi south east of Lundy Island, Devon by a Kaiserliche Marine submarine.
 * SS Tewfikieh (1893) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 115 nmi west north west of Alexandria by SMU UB-105 with the loss of five of her crew.
 * SS Vandalia (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 18 nmi west north west of the Smalls Lighthouse (51.73333°N, -6.16667°W) by SMU U-96 . Her crew survived.

10 June

 * SS Boma (1889) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 10 nmi south west by west of Beer Head, Devon (50.53333°N, -3.23333°W) by SMU UB-80 . Her crew survived.
 * SS Borg (1888) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 20 nmi south west by south of The Lizard, Cornwall (49.61667°N, -5.11667°W) by SMU UB-103 with the loss of 24 of her crew.
 * SS Brodholme (1899) ( undefined): World War I: The cargo ship was torpedoed and damaged in the Mediterranean Sea 3.5 nmi north east of Syracuse, Sicily, Italy by SMU UC-53 with the loss of four of her crew. She was beached but was later refloated.
 * SS Dora (1881) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea 3.5 nmi east of Whitby, Yorkshire, United Kingdom (55.3°N, -1.53333°W) by SMU UB-88.
 * SS Henrik Lund (1906) (🇳🇴 Norway): World War I: The cargo ship was scuttled in the Atlantic Ocean (36.5°N, -71.48333°W) by SMU U-151 . Her crew survived.
 * HMS Lowtyne : World War I: The Q-ship was torpedoed and sunk in the North Sea 3.5 nmi east south east of Whitby (54.48333°N, -0.5°W) by SMU UB-34 with the loss of three of her crew.
 * HMML 64 : The motor launch was lost on this date.
 * SS Mountby (1898) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 8 nmi east by south of The Lizard, Cornwall (49.96667°N, -5.01667°W) by SMU UC-49 . Her crew survived.
 * SS Nivernais (1882) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea south of the Balearic Islands, Spain (38.16667°N, 4.11667°W) by SMU UB-48.
 * SS Princess Maud (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 5 nmi north east by north of Blyth, Northumberland by SMU UB-88 with the loss of three of her crew.
 * SS Stryn (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 5 nmi east of Berry Head, Devon by SMU UB-80 with the loss of eight of her crew.
 * SMS Szent István : World War I: The was torpedoed and sunk in the Adriatic Sea off Pula, Croatia-Slavonia by ITALIAN TORPEDO BOAT MAS-15  with the loss of 89 of her 1,094 crew.
 * SS Vindeggen (1916) (🇳🇴 Norway): World War I: The cargo ship was scuttled in the Atlantic Ocean (36.41667°N, -71.33333°W) by SMU U-151 with the loss of a crew member.

11 June

 * SS Lorle (1896) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 12 nmi south west of The Lizard, Cornwall] (49.78333°N, -5.23333°W) by SMU UB-103 with the loss of nineteen of her crew.

12 June

 * SS Afrique (1911) (🇫🇷 France): World War I: The cargo ship was torpedoed and sunk in the North Sea 6 nmi north west of Whitby, Yorkshire, United Kingdom by SMU UC-40 with the loss of twelve of her crew.
 * SS Kennington (1918) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 15 nmi off Flamborough Head, Yorkshire by SMU UB-108 with the loss of four of her crew.
 * SS Kul (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 3.5 nmi north east of the Wolf Rock, Cornwall (50°N, -5.76667°W) by SMU UB-103 with the loss of four of her 21 crew.
 * Poincare (Flag of French Tunisia.svg Tunisia): World War I: The sailing vessel was sunk in the Mediterranean Sea west of Malta by SMU UC-20.

13 June

 * SS Agnes (1883) (🇸🇪 Sweden): World War I: The cargo ship was torpedoed and sunk in the North Sea 12 nmi east of Flamborough Head, Yorkshire, United Kingdom by SMU UB-107 . Her crew survived.
 * HMS Conquest (1915) : World War I: The struck a mine and was damaged in the North Sea 2.5 nmi south west of the Sunk Lightship ( undefined) (51.84583°N, 1.575°W) with the loss of seven of her crew. She was subsequent repaired and returned to service.
 * SS Kalo (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 18 nmi south east of Flamborough Head by SMU UB-107  with the loss of three of her crew.
 * SS Octo (1910) (🇳🇴 Norway): World War I: The cargo ship struck a mine and sank in the Mediterranean Sea north east of Zemra Island, Tunisia (37.13333°N, 10.9°W) with the loss of twelve of her crew.
 * HMS Patia (1913) : World War I: The armed boarding steamer was torpedoed and sunk in the Atlantic Ocean 25 nmi west of Hartland Point, Devon (50.88333°N, -5.68333°W) with the loss of sixteen of her crew.
 * SS Penhallow (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 52 nmi north by west of Cape Caxine, Algeria by SMU UB-48 with the loss of a crew member.

14 June

 *  Kringsjå (🇳🇴 Norway): World War I: The four-masted barque was shelled and sunk in the Atlantic Ocean 90 nmi off the coast of Virginia, United States (38.03333°N, -71.66667°W) by SMU U-151 . Her crew survived.
 * HMT Princess Olga : World War I: The naval trawler struck a mine and sank in the English Channel off Le Havre, Seine-Maritime, France. Her crew survived.
 *  Samoa (🇳🇴 Norway): World War I: The four-masted barque was shelled and sunk in the Atlantic Ocean 90 nmi off the coast of Virginia (37.5°N, -72.16667°W) by SMU U-151 . Her crew survived.

16 June

 * SS Melanie (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 5 nmi south east of Whitby, Yorkshire by SMU UC-40 with the loss of five of her crew.
 * HMT Ocean Fisher: The naval trawler, operating as a Q-ship, was lost on this date.

17 June

 * SS Kieldrecht (1916) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 21 nmi east by south of Flamborough Head, East Riding of Yorkshire by SMU UB-107 . Her crew survived.
 * SMU U-64 (Germany) : World War I: The Type U 63 submarine was depth charged, shelled and sunk in the Mediterranean Sea (38.11667°N, 10.45°W by HMS Lychnis with the loss of 38 of her 43 crew.

18 June

 * SS Dwinsk ( undefined): World War I: The ocean liner was torpedoed and sunk in the Atlantic Ocean 400 nmi north east of Bermuda by SMU U-151  with the loss of 22 lives. Survivors were rescued by USS Rondo (ID-2488), USS Siboney (ID-2999) and USS Von Steuben (ID-3017) (all ).
 * RUSSIAN DESTROYER Fidonsi : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Gromki : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Kapitam-Leitenant Baranov : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Kerch : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Leitnant Shestakov : World War I: The was scuttled at Sevastopol.
 * SS Norfolk Coast (1910) ( undefined): World War I: The coaster was torpedoed and sunk in the North Sea 23 nmi south east of Flamborough Head, Yorkshire (53.66667°N, 0.46667°W) by SMU UB-30 with the loss of eight crew.
 * RUSSIAN DESTROYER Pronzitelny : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Smyetlivi : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Stremitelni : World War I: The was scuttled at Sevastopol.
 * RUSSIAN DESTROYER Svobodnaya Rossiya : World War I: The was scuttled at Sevastopol.

20 June

 * SMU UC-64 : World War I: The Type UC II submarine struck a mine and sank in the Strait of Dover (50.96667°N, -1.38333°W) with the loss of all 30 crew.

21 June

 * Eglantine (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea by SMU U-86 with the loss of eight of her crew.
 * SS Montebello (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 320 nmi west of Ouessant, Finistère, France (47.08333°N, -12.75°W) by SMU U-100 with the loss of 41 crew.
 * USS Schurz : The was rammed and sunk in the Atlantic Ocean south west of the Cape Lookout Lightship  by Florida (🇺🇸 United States) with the loss of a crew member.

22 June

 * SS Avance (1883) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea off Flamborough Head, Yorkshire, United Kingdom (54.21667°N, -0.13333°W) by SMU UB-88 . Her crew survived.
 * USS Californian (1900) : World War I: The cargo ship struck a mine and sank in the Bay of Biscay. Her crew were rescued by USS Corsair (SP-159).
 *  Camp Boulhant (🇫🇷 France): The four-masted schooner was driven ashore and wrecked. Her crew survived.
 * SS Chilier (1907) (🇧🇪 Belgium): World War I: The cargo ship was captured by, and sunk by gunfire from, SM U-151 in the Atlantic Ocean off Newfoundland (39.5°N, -53.66667°W).
 *  Metamorphosis (🇬🇷 Greece): World War I: The schooner was scuttled in the Mediterranean Sea south of Syracuse, Sicily, Italy (37.23333°N, -16.28333°W) by SMU UC-52.
 * Rana (🇳🇴 Norway): World War I: The sailing vessel was sunk in the Skaggerak 25 nmi south west by south of Ryvingen, Rogaland (57.2°N, 6.6°W) by SMU U-111 . Her crew survived.
 * SS Rhea (1917) ( undefined): World War I: The cargo ship struck a mine and sank in the English Channel off Étaples, Pas-de-Calais. Her crew survived.

23 June

 * SS Augvald (1898) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean by SMU U-151 with the loss of three of her crew.
 * SS London (1892) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 4 nmi north east of Whitby, Yorkshire by SMU UB-88 . Her crew survived.
 * Mountain Laurel (🇳🇴 Norway): World War I: The sailing vessel was sunk in the Atlantic Ocean 25 nmi north west of Rathlin Island, County Antrim, United Kingdom (55.63333°N, -6.63333°W) by SMU UB-73 with the loss of eleven of her crew.

24 June

 *  Caroline (🇩🇰 Denmark): World War I: The three-masted schooner was sunk in the Atlantic Ocean north west of Ireland (56.65°N, -10.01667°W) by SMU U-102 . Her crew survived.
 * HMS D6 : World War I: The D-class submarine was sunk in the Atlantic Ocean 12 nmi north of Inishtrahull Island, County Donegal (55.61667°N, -7.25°W) by SMU UB-73 with the loss of 24 of her 26 crew. Both survivors were rescued by SM UB-73.
 * Maria (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea south of Syracuse, Sicily, Italy by SMU UC-52.
 *  Saint Antoine (🇫🇷 France): World War I: The schooner was sunk in the Mediterranean Sea 15 nmi off Mahdia, Tunisia by SMU UB-68 . Her crew survived.
 * Sophia ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea south of Syracuse by SMU UC-52.

25 June

 * SS African Transport (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 3 nmi north of Whitby, Yorkshire by SMU UB-88 with the loss of three of her crew.
 * SS Moorlands (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 3 nmi south east of Whitby by SMU UB-88 with the loss of ten of her crew.
 * RMS Orissa ( undefined): World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 21 nmi south west by west of Skerryvore by SMU UB-73 with the loss of six lives.
 * SMS T59 : The torpedo boat collided with another vessel and sank in the Baltic Sea with the loss of 21 of her crew.

26 June

 * HMT Achilles II : World War I: The naval trawler struck a mine and sank in the North Sea off the Shipwash Lightship ( undefined) (52.075°N, 1.8°W) with the loss of thirteen of her crew.
 * SS Atlantian (1899) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 110 nmi north west by west of Eagle Island, County Mayo (55.7°N, -12.95°W) by SMU U-86 . Her crew survived, but two of them were taken as prisoners of war.
 * SS Tortuguero (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 205 nmi north west of Eagle Island (55.83333°N, -15.5°W) by SMU U-156 with the loss of twelve of her crew.
 * SMU UC-11 : World War I: The Type UC I submarine struck a mine and sank in the Strait of Dover (51.91667°N, 1.68333°W) with the loss of eighteen of her nineteen crew.
 * SS Wimerra ( undefined): World War I: The cargo ship struck a mine and sank in the Pacific Ocean 24 nmi north west of Hooper's Point, South Island, New Zealand with the loss of sixteen of her crew.

27 June

 * SS Keelung (1914) ( undefined: World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 110 nmi west by south of Ouessant, Finistère, France by SMU U-53 with the loss of six crew.
 *  : World War I: The hospital ship was torpedoed and sunk in the Atlantic Ocean 116 nmi west of the Fastnet Rock by SMU U-86 with the loss of 234 of the 258 people on board.
 * SS Sotolongo (1892) (🇪🇸 Spain): World War I: The cargo ship was sunk in the Mediterranean Sea 35 nmi off Maritimo Island (38.06667°N, 11.35°W) by SMU U-65 (Germany) . Her crew survived.

28 June

 * HMS D6 : World War I: The D-class submarine was sunk in the Atlantic Ocean 73 nmi north of Inishtrahull Island, County Donegal by SMU UB-73 with the loss of all 25 crew.
 *  Dictator ( undefined): World War I: The schooner was scuttled in the Atlantic Ocean by SMU U-151 . Her crew survived and were taken as prisoners of war.
 * Elbjorg (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea off the Tongue Lightship ( undefined (57.83333°N, 8.7°W) by SMU UC-59 . Her crew survived.
 * Pochard ( undefined): World War I: The trawler struck a mine and sank in the North Sea 40 nmi north east of the Spurn Lightship ( undefined). Her crew survived.
 * SS Queen (1907) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 130 nmi north of Cape Villano, Spain (44.41667°N, -10.41667°W) by SMU U-53 ( with the loss of twenty crew.
 * SS Sunniva (1917) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 4 nmi east of Sunderland, County Durham by SMU UC-17  with the loss of two of her crew.

29 June

 * Ariadne (🇳🇴 Norway): World War I: The sailing vessel was damaged in the North Sea (57.33333°N, 5.53333°W) by SMU UC-59 . She was towed into Frederikshavn but was declared a constructive total loss.
 * Castor I (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea 30 nmi west of Ragefjord by SMU U-107 . Her crew survived.
 *  Drowning Thyra (🇩🇰 Denmark): World War I: The auxiliary four-masted schooner was sunk in the North Sea 20 nmi off Lindesnes, Vest-Agder, Norway (57.5°N, 6.7°W) by SMU UC-59 . Her crew survived.
 * SS Florentia (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 2 nmi east by north of Robin Hood's Bay, Yorkshire by SMU UB-40 with the loss of three of her crew.
 * SS Grekland (1905) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea east of Flamborough Head, Yorkshire (54.15°N, 0.03333°W) by SMU UB-40.
 * SS Herdis (1911) ( undefined}): World War I: The cargo ship was torpedoed and sunk in the North Sea 7 nmi south east by south of Robin Hood's Bay (54.33333°N, -0.33333°W) by SMU UB-88 . Her crew survived.
 * Midstjø (🇳🇴 Norway): World War I: The sailing vessel was sunk in the Skagerrak 15 nmi south of the Songvår Lighthouse, Vest-Agder by SMU U-80 . Her crew survived.
 * SS Sixty-six (1871) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 3 nmi east of Scarborough, Yorkshire by SMU UB-88 with the loss of six of her crew.

30 June

 * SS Origen ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 115 nmi west of Ouessant, Finistère, France by a Kaiserliche Marine submarine with the loss of a crew member.
 *  W. M. L. ( undefined): World War I: The three-masted schooner was shelled and sunk in the Atlantic Ocean 400 nmi north north west of Cape Finisterre, Spain by SMU U-53 with the loss of four crew.