List of shipwrecks from 1-15 April 1917

The list of shipwrecks from 1–15 April 1917 includes some ships sunk, foundered, grounded, or otherwise lost during April 1917.

1 April

 * SS Bergenhus (1912) (🇩🇰 Denmark): World War I: The passenger ship was sunk in the North Sea 130 nmi east of the Farne Islands, Northumberland, United Kingdom by SMU UC-40 .There were no casualties.
 * SS Camilla (1908) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 150 nmi west of Skudesnes, Rogaland (56.53333°N, 3.98333°W) by SMU UB-35 with the loss of eight of her crew.
 * SS Consul Persson (1890) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea (58.35°N, 2.91667°W) by SMU U-54 . Her crew survived.
 *  Eastern Belle ( undefined): World War I: The ketch was scuttled in the English Channel 30 nmi south west of St. Catherine's Point, Isle of Wight by SMU UC-72 . Her crew survived.
 * Endymion ( undefined): World War I: The ketch was shelled and sunk in the English Channel off Start Point, Devon by SMU UB-32 with the loss of four crew.
 * SS Ester (1917) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the North Sea (56.53333°N, 4.3°W) by SMU UB-35 . Her crew survived.
 * SS Fjelland (1898) (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea 50 nmi south west by west of Utsire, Rogaland (58.33333°N, 5.83333°W) by SMU U-54 with the loss of a crew member.
 * Jolie Brise (🇫🇷 France): World War I: The fishing vessel was sunk in the Atlantic Ocean 20 nmi off Audierne, Finistère by SMU UB-36.
 * SS Kasenga ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 2 nmi off Cape Palos, Spain by an enemy submarine.
 * Maria Santissima D. Grazie ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Sicily by SMU U-65 (Germany).
 * Maria T. ( undefined: World War I: The sailing vessel was sunk in the Mediterranean Sea off Sicily by SMU U-65 (Germany).
 * Providence de Dieu (🇫🇷 France): World War I: The fishing vessel was sunk in the Atlantic Ocean 20 nmi off Audierne by SMU UB-36.
 *  Silvia ( undefined): World War I: The schooner was scuttled in the English Channel 15 nmi south south east of the Owers Lightship ( undefined) (50.31667°N, -0.46667°W) by SMU UB-39 . Her crew survived.
 * SS Warren (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Tyrrhenian Sea 20 nmi south west of Civitavecchia, Lazio, Italy (41.85°N, 11.36667°W) by SMU UC-38 with the loss of three of her crew. Her captain was taken as a prisoner of war.
 * SS Zambesi (1901) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 15 nmi north by west of Alexandria, Egypt (31.43333°N, 29.81667°W) by SMU U-63 (Germany) with the loss of three crew.

2 April

 * SS Britannia (1885) ( undefined): World War I: The cargo ship torpedoed and was sunk in the Mediterranean Sea 22 nmi west north west of Pantelleria, Italy (36.58333°N, 11.46667°W) by SMU U-65 (Germany) . Her crew survived, but two of them were taken as prisoners of war.
 * HMT Commandant : World War I: The naval trawler struck a mine and sank in the North Sea off the Sunk Lightship ( undefined) (51.55°N, 1.6°W) with the loss of five of her crew.
 * ST Filicudi : World War I: The naval tug struck a mine and sank in the Mediterranean Sea off Trapani, Sicily.
 * SS Havlyst (1895) (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea off Lindesnes, Vest-Agder (57.5°N, 6.83333°W) by SMU U-54 . Her crew survived.
 * Lord Scarborough ( undefined): World War I: The trawler was sunk in the North Sea 100 nmi east of the Isle of May, Fife by SMU UB-35 . Her crew survived.
 *  Saggita (🇳🇴 Norway): World War I: The barque was sunk in the North Sea (60°N, -2°W) by SMU U-78 . Her crew survived.
 *  Snespurven (🇳🇴 Norway): World War I: The barque was shelled and sunk in the Atlantic Ocean 25 nmi south south west of the Tuskar Rock, Ireland (50.91667°N, -7.05°W) by SMU U-59 . Her crew survived.
 * SS Zealandia (1875) (🇺🇸 United States) The ship ran aground off Southport, Lancashire, United Kingdom.

3 April

 *  Annunziata A. ( undefined): World War I: The brigantine was scuttled in the Mediterranean Sea east of Sardinia (39.86667°N, 10.06667°W) by SMU UC-38.
 * SS Ardgask (1917) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 15 nmi south west of Cape Rosello, Sicily by SMU U-35 (Germany) with the loss of a crew member.
 *  Caterina R. ( undefined): World War I: The barquentine was scuttled in the Mediterranean Sea east of Sicily (39.45°N, 9.76667°W) by SMU UC-38.
 * Domenico ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea east of Sardinia (39.4°N, 9.91667°W) by SMU UC-38.
 *  Ellen James ( undefined): World War I: The schooner was shelled and sunk in the Atlantic Ocean west of Ouessant, Finistère, France by SMU UC-71 with the loss of five of her crew.
 * SS Ernest Simons (1893) (🇫🇷 France): World War I: The passenger ship was sunk in the Mediterranean Sea north east of Cap Sera, Algeria (37.13333°N, 8.46667°W) by SMU UC-37 . Her crew survived.
 * SS Hesperus (1903) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 72 nmi off the Bishop Rock, Isles of Scilly, United Kingdom (48.83333°N, -7.33333°W) by SMU U-46 . Her crew survived.
 * Maria Ferrara ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea west of Sicily by SMU U-65 (Germany).
 * Nuova Maria di Porto Salvo ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea east of Sicily by SMU UC-38.
 * SS Saint Simon (1912) (🇫🇷 France): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 20 nmi north west of La Galite, Tunisia (37.6°N, 8.63333°W) by SMU UC-37.
 * SS Vasilefs Constantinos (1913) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Aegean Sea 45 nmi south west of Akra Akritas by SMU UB-43.

4 April

 * SS City of Paris (1907) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Mediterranean Sea 46 nmi south by east of Cap d'Antibes, Alpes-Maritimes, France (42.9°N, 7.63333°W) by SMU UC-35 with the loss of 122 lives.
 * SS Domingo (1881) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean off Queenstown, County Cork, United Kingdom by SMU U-60.
 * Gibraltar ( undefined): World War I: The trawler was scuttled in the North Sea 20 nmi east north east of Rattray Head, Aberdeenshire by SMU UB-35 . Her crew survived.
 * SS Hundvaagø (1915) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and damaged in the Atlantic Ocean south west of Ireland. She was beached at Castletownbere, County Cork. Subsequently repaired and returned to service.
 * SS Hunstanton (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 36 nmi west of the Isles of Scilly (49.83333°N, -7.66667°W) by SMU UC-30 . Her crew survived.
 * Maggie Ross ( undefined): World War I: The trawler was shelled and sunk in the North Sea 60 nmi north east of Girdle Ness, Aberdeenshire by SMU UB-35 . Her crew survived.
 * SS Margit (1903) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 80 nmi south west of Cape Matapan, Greece (35.46667°N, 21.4°W) by SMU U-63 (Germany) . Her crew survived.
 *  Marguerite (🇺🇸 United States): World War I: The four-masted schooner was damaged in the Mediterranean Sea 35 nmi south west of Sardinia by SMU U-35 (Germany) . She sank the next day; her crew survived.
 * SS Missourian (1903) (🇺🇸 United States): World War I: The cargo ship was sunk in the Tyrrhenian Sea off Porto Maurizio, Liguria, Italy by SMU U-52 . Her crew survived.
 *  Monte Protedigo (🇦🇷 Argentina): World War I: The barquentine was sunk in the Atlantic Ocean off the Isles of Scilly (49.45°N, -6.73333°W) by SMU UC-30.
 * SS Parana (1893) (🇧🇷 Brazil): World War I: The cargo ship was sunk in the English Channel off Barfleur, Manche, France by SMU UB-32 . Her crew survived.
 * SS Parkgate (1906) ( undefined): World War I: The cargo ship was scuttled in the Mediterranean Sea 80 nmi north east of the Cap de Fer, Algeria (38.2°N, 8.16667°W) by SMU U-35 (Germany) with the loss of sixteen crew. Her captain was taken as a prisoner of war.
 * SS Penseiro (1888) ( undefined): World War I: The cargo ship was scuttled in the Atlantic Ocean 40 nmi west of the Isles of Scilly by SMU UC-71 . Her crew survived.
 * SS Ravenna (1901) ( undefined): World War I: The passenger ship was sunk in the Tyrhhenian Sea 2 nmi off Cape Mele, Liguria (44°N, 8.46667°W) by SMU U-52.
 * San Giovanni Battiste ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea by SMU UC-37.
 * SS Trevier (1907) (🇧🇪 Belgium) World War I: The cargo ship was torpedoed, shelled and sunk in the North Sea off Scheveningen, South Holland, Netherlands (52.25°N, 3.81667°W) by SM UB-23.
 * SS Vladimir Reitz (1905) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the Atlantic Ocean 40 nmi north west by north of Foula, Shetland Islands, United Kingdom by SMU U-78 with the loss of two crew.

5 April

 *  Amiral L'Hermite (🇫🇷 France): World War I: The schooner was scuttled in the Atlantic Ocean 60 nmi west north west of the Blasket Islands, County Kerry, United Kingdom by SMU U-59.
 * Angel Marina ( undefined): World War I: The sailing vessel was scuttled in the Ligurian Sea (43.26667°N, 7.16667°W) by SMU U-52.
 * SS Benheather (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 110 nmi west north west of the Fastnet Rock (51.33333°N, -12.5°W) by SMU U-46 . Her crew survived.
 *  Bris (🇩🇰 Denmark): World War I: The schooner was sunk in the Atlantic Ocean 20 nmi north of the Butt of Lewis, Outer Hebrides, United Kingdom by SMU U-78 with the loss of two of her crew.
 * SS Calliope (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Tyrrhenian Sea 35 nmi south west of Ustica, Italy (38.36667°N, 11.41667°W) by SMU U-65 (Germany) with the loss of six lives. Three survivors were taken as prisoners of war.
 * SS Canadian (1900) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 47 nmi north west of the Fastnet Rock (51.6°N, -10.8°W) by SMU U-59 with the loss of a crew member.
 * SS Dicto (1904) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean south east of the Armen Rock by SMU UB-39 with the loss of a crew member.
 *  Dunkerquois (🇫🇷 France): World War I: The schooner was sunk in the Atlantic Ocean 45 nmi off the Blasket Islands by SMU U-86.
 *  Ebenezer (🇩🇰 Denmark): World War I: The three-masted schooner was shelled and sunk in the Atlantic Ocean 10 nmi south west of St. Kilda, United Kingdom (57.96667°N, -8.33333°W) by SMU U-57 . Her crew survived.
 *  Ernest Legouve (🇫🇷 France): World War I: The barque was torpedoed and sunk in the English Channel 5 nmi west by south of St. Catherine's Point, Isle of Wight, United Kingdom (50.5°N, -1.43333°W) by SMU UB-32 with the loss of twenty of her 24 crew.
 * SS Gower Coast (1899) ( undefined): World War I: The coaster struck a mine and sank in the English Channel off Le Tréport, Seine-Maritime, France with the loss of all fifteen crew.
 *  Marie Celine (🇫🇷 France): World War I: The schooner was sunk in the Atlantic Ocean south west of Ireland by SMU U-86.
 * SS N. J. Fjord (1896) (🇩🇰 Denmark): World War I: The cargo ship was scuttled in the North Sea 40 nmi east north east of Coquet Island, Northumberland, United Kingdom. Her crew survived.
 * Roland (🇫🇷 France): World War I: The sailing vessel was sunk in the Atlantic Ocean 80 nmi west north west of the Blasket Islands by SMU U-59.
 * SS San Fulgencio (1901) (🇪🇸 Spain): World War I: Teh cargo ship was sunk in the Bay of Biscay off Sables d'Olonne, Vendée, France by SMU UC-71.
 * SS Siberier (🇧🇪 Belgium) World War I: The cargo ship was torpedoed and damaged in the Atlantic Ocean 40 nmi west of the Fastnet Rock (52.3°N, -11.66667°W) by SMU U-86 . She was taken in tow but sank the next day.
 * SS Solstad (1916) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Ionian Sea north west of Cythera, Greece (36.03333°N, 20.83333°W) by SMU U-63 (Germany) . Her crew survived.
 * SS Vilja (1915) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the Atlantic OCean 135 nmi west of the Fastnet Rock (52.2°N, -13.11667°W) by SMU U-55 with the loss of a crew member.

6 April

 * Cybele (🇫🇷 France): World War I: The sailing vessel was sunk in the Mediterranean Sea of Cabo de Gata, Almeria, Spain by SMU UC-25.
 * SS Kongshaug (1884) (🇳🇴 Norway): World War I: The coaster was captured and scuttled in the North Sea 45 nmi north of Kinnaird Head, Aberdeenshire, United Kingdom by SM UB-35 . Her crew were rescued by a Scottish fishing vessel.
 *  La Tour d'Auvergne (🇫🇷 France): World War I: The brig was shelled and set on fire in the Atlantic Ocean 15 nmi south south east of the Longships Lighthouse by SMU UB-39 . She was towed to Mullion, Cornwall, United Kingdom but was declared a constructive total loss. Her crew survived.
 * Lord Kitchener ( undefined): World War I: The trawler was scuttled in the North Sea 45 nmi north by east of Kinnaird Head by SMU UB-35 . Her crew survived.
 *  Marion (🇳🇴 Norway): World War I: The barque was shelled and sunk in the Atlantic Ocean (52.16667°N, -13.76667°W) by SMU U-60 with the loss of a crew member.
 * Narberth Castle ( undefined): World War I: The trawler was shelled and sunk in the North Sea 30 nmi north north west of Dennis Head Old Beacon, North Ronaldsay, Orkney Islands by SMU UC-27 . Her crew survived.
 * Nestor ( undefined): World War I: The trawler was shelled and sunk in the North Sea 20 nmi north west by north of North Ronaldsay by SMU UC-27 . Her crew survived.
 *  Perce Neige (🇫🇷 France): World War I: The schooner was sunk in the Atlantic Ocean off Lands End, Cornwall, United Kingdom by SMU UB-39.
 * SS Powhatan (1898) ( undefined): World War I: The tanker was torpedoed and sunk in the Atlantic Ocean 25 nmi north by west of North Rona (59.53333°N, -6.5°W) by SMU U-66 with the loss of 36 crew. Her captain was taken as a prisoner of war.
 * SS Presto (1905) ( undefined): World War I: The cargo ship struck a mine and sank in the North Sea 4 nmi east of Roker Point, Sunderland, County Durham (54.95°N, -1.26667°W) with the loss of six of her crew.
 * Rahmanich (🇪🇬 Egypt): World War I: The ship was sunk in the Mediterranean Sea off the coast of Egypt by SMU UC-34.
 * Recto ( undefined): World War I: The trawler was scuttled in the North Sea 45 nmi north by east of Kinnaird Head by SMU UB-35 . Her crew survived.
 * SS Rosalind (1913) ( undefined): World War I: The tanker was torpedoed and sunk in the Atlantic Ocean 180 nmi west north west of the Fastnet Rock (51.65°N, -14.33333°W) by SMU U-86 with the loss of two of her crew.
 * SS Spithead (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 12 nmi north by west of the Damietta Lighthouse, Egypt (31.73333°N, 31.76667°W) by SMU UC-34 with the loss of a crew member.
 * HMT Strathrannoch : World War I: The naval trawler struck a mine and sank in the North Sea off St. Abb's Head, Berwickshire (55.91667°N, -2.11667°W) with the loss of all thirteen crew.
 * SS Thelma (1884) (🇳🇴 Norway): World War I: The cargo ship struck a mine and sank in the English Channel 4 nmi south by west of the Owers Lightship ( undefined) by SMU UC-65 with the loss of a crew member.
 * SS Vine Branch (1896) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Ireland (49.75°N, -14.13333°W) by SMU U-55 with the loss of all 44 crew.

7 April

 * SS Caminha (1907) (🇵🇹 Portugal) World War I: The cargo ship was sunk in the Bay of Biscay 30 nmi south south west of Cape Ferrat (45.36667°N, -2.8°W) by gunfire from SM UC-71.
 * SMS Cormoran (1909) : World War I: The merchant raider was scuttled at Guam with the loss of nine crew.
 *  Edwin R. Hunt (🇺🇸 United States): World War I: The schooner was sunk in the Mediterranean Sea 40 nmi off Cabo de Gata, Almeria, Spain by SMU UC-25 . Her crew survived.
 *  Fiskaa (🇳🇴 Norway): World War I: The barque was sunk in the Atlantic Ocean 10 nmi off St. Kilda, United Kingdom by SMU U-46 . Her crew survived.
 * HMS Jason (1892) : World War I: The minesweeper struck a mine and sank off Coll, Inner Hebrides (56.59583°N, -6.47083°W) with the loss of 25 crew.
 * SS Lapland ( undefined) World War I: The passenger ship struck a mine off the Liverpool Bar Lightship ( undefined) and was damaged. She was later repaired and returned to service.
 * SS Maplewood (1915) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 47 nmi south west of Cape Sperone, Sardinia, Italy by SMU U-35 (Germany) . Her crew survived.
 * SS Salmo (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 210 nmi north west of the Fastnet Rock (52.5°N, -14.66667°W) by SMU U-60 with the loss of two crew.
 * SS Seward (1907) (🇺🇸 United States): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 22 nmi north east of Begur, Spain (42.7°N, 3.68333°W) by SMU U-52 . Her crew survived.
 * SS Trefusis (1893) ( undefined): World War I: The collier was scuttled in the Mediterranean Sea 30 nmi south east of Cape Pula, Sardinia (38.63333°N, 9.41667°W) by SMU U-65 (Germany) . Her crew survived, but three survivors were taken as prisoners of war.

8 April

 * SS Alba (1881) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea 3 nmi off Garraf, Catalonia, Spain (41.08333°N, 1.88333°W) by SMU U-52.
 * SMS G88 : World War I: The V25-class destroyer was torpedoed and sunk in the North Sea by a Royal Navy Coastal Motor Boat.
 * Geilan Bahri ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea 54 nmi off Alexandria, Egypt by SMU UC-34.
 * SS Livatho (1891) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea north west of Crete (36.4°N, 20.93333°W) by SMU UB-47 . Her crew survived.
 * Lucia ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Cape Pula, Sardinia by SMU U-65 (Germany).
 * SS Nestos (1914) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 50 nmi west south west of Sapientza (36.45°N, 20.98333°W) by SMU UB-47.
 * Papa Gian Battista ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off Cape Pula, Sardinia by SMU U-65 (Germany).
 * SS Petridge (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 200 nmi west north west of Ouessant, Finistère, France (48.23333°N, -10.16667°W) by SMU U-55 . Her crew survived, but two of them were taken as prisoners of war.
 * SS Torrington (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic OCean 150 nmi south west of the Isles of Scilly by SMU U-55 with the loss of 34 crew. Her captain was taken as a prisoner of war.
 * SS Umvoti (1896) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic OCean 200 nmi west north west of Ouessant (48.8°N, -10.25°W) by SMU U-55 with the loss of four crew. Two survivors were taken as prisoners of war.

9 April

 * SS Avon (1894) ( undefined): World War I: The passenger ship struck a mine and sank in the Thames Estuary 2.5 nmi south east by south of the Tongue Lightship ( undefined) (51.48333°N, 1.44167°W) with the loss of two lives.
 * SS Cairnie ( undefined): The coaster dragged her anchors, collided with another vessel and sank. Her crew were rescued.
 * SS Esterel (1904) (🇫🇷 France): World War I: The cargo shipb was sunk in the Mediterranean Sea off Port-Vendres, Pyrénées-Orientales (42.65°N, 3.5°W) by SMU U-52.
 *  Fremad I: 🇳🇴 Norway): World War I: The barque was sunk in the North Sea 200 nmi off Lindesnes, Vest-Agder (58.78333°N, 0.86667°W) by SMU U-59 . Her crew survived.
 * SS Ganslei (1904) ( undefined): World War I: The cargo ship was sunk in Kola Bay (69.31667°N, 33.51667°W) by SMU U-75.
 * SS Kittiwake (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 25 nmi north west of the Maas Lightship (🇳🇱 Netherlands) (52.25°N, 3.3°W) by SMU UB-30 with the loss of seven crew.
 * HMT Ortho : World War I: The naval trawler struck a mine and sank in the North Sea off Lowestoft, Suffolk (52.38333°N, 1.875°W) with the loss of a crew member.
 * Saint Maudez (🇫🇷 France): World War I: The sailing vessel was sunk in the English Channel 10 nmi north north west of Fécamp, Seine-Maritime by SMU UB-39.
 * SS Themistoclis (1880) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Atlantic Ocean 100 nmi off Pointe Saint-Mathieu, Finistère, France by SMU UC-71.
 * SS Valhall (1902) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 30 nmi north of the Pierres Noires, Finistère by SMU UC-71 . Her crew survived.

10 April

 * Abd Razid (Flag of French Tunisia.svg Tunisia): World War I: The sailing vessel was sunk in the Mediterranean Sea off Tripoli, Libya by SMU UC-20.
 * SS Dalton (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Cape Matapan, Greece (36°N, 22.66667°W) by SMU U-28 (Austria-Hungary) . Her crew survived.
 * HMS P26 : World War I: The P-class sloop struck a mine and sank in the English Channel off Le Havre, Seine-Maritime, France with the loss of nineteen of her 59crew. Survivors were rescued by HMS P19 (
 * SS Pluto (1897) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 32 nmi south east by east of Lowestoft, Suffolk (52.31667°N, 2.56667°W) by SMU UB-20 . Her crew survived.
 * SS Porto di Rodi (1897) ( undefined: World War I: The cargo ship was sunk in the Ionian Sea 37.88333°N, 18.03333°W) SMU U-32 (Germany) with the loss of 31 crew.
 * SS Ranvik (1911) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 45 nmi west south west of Ouessant, Finistère, France by SMU UC-71 . Her crew survived.
 *  : World War I: The hospital ship struck a mine and sank at Le Havre with the loss of 130 of the 205 people on board.

11 April

 * HMT Amy : World War I: The naval trawler struck a mine and sank in the English Channel off Le Havre, Seine Maritime, France with the loss of nine of her crew.
 *  Ansgar (🇩🇰 Denmark): World War I: The barquentine was set afire and sunk in the Mediterranean Sea off Cape San Antonio, Spain (39.1°N, 0.5°W) by SMU U-52 . Her crew survived.
 * SS Candia (1862) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea off Zuwara, Libya by SMU UC-20.
 * SS Cyfarthfa (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 32 nmi west south west of Antikythera, Greece (35.48333°N, 22.5°W) by SMU UB-47 . Her crew survived.
 * SS Duchess of Cornwall (1889) ( undefined): World War I: The cargo ship struck a mine and sank in the English Channel 5 nmi north of Cape Barfleur, Manche, France with the loss of 23 of her crew.
 * SS Imperial Transport (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 140 nmi north west by north of Alexandria, Egypt by SMU UC-34 . Her crew survived, but her captain was taken as a prisoner of war.
 *  Miss Morris ( undefined): World War I: The three-masted schooner was scuttled in the Mediterranean Sea 20 nmi south east of Garrucha, Andalusia, Spain (36.95°N, -1.83333°W) by SMU U-35 (Germany) . Her crew survived.
 * SS Nancy (1888) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the North Sea 42 nmi off the Hellisøy Lighthouse, Hordaland, Norway by SMU U-30 (Germany) with the loss of three crew.
 * Precedent ( undefined): World War I: The fishing smack was scuttled in the English Channel 12 nmi east south east of Berry Head, Devon by SMU UB-38 . Her crew survived.
 * SS Quaggy (1904) ( undefined): World War I: The coaster struck a mine and sank in the North Sea 3 nmi east of Robin Hood's Bay, Yorkshire with the loss of two of her crew.
 *  Sarvsfos (🇳🇴 Norway): World War I: The barque was sunk in the North Sea 80 nmi south east of Kirkwall, Orkney Islands (58.55°N, °W) by SMU U-50 . Her crew survived.
 * SS Saxo (1907) (🇩🇰 Denmark: World War I: The coaster was sunk in the North Sea 42 nmi off the Hellisøy Lighthouse by SMU U-30 (Germany) . Her crew survived.
 * SS Star (1907) (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea 68 nmi off the coast of Fife, United Kingdom by SMU U-30 (Germany) . Her crew survived.
 *  Sylfiden (🇳🇴 Norway): World War I: The barque was sunk in the Barents Sea 50 nmi north by west of Holmengrå, Finnmark by SMU U-30 (Germany) . Her crew survived.
 * SS Tremorvah (1905) ( undefined): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 70 nmi north north west of Cape Bougaroni, Algeria by SMU U-65 (Germany) . Her crew survived, but four of them were taken as prisoners of war.

12 April

 *  Angela M. ( undefined): World War I: The three-masted schooner was scuttled in the Mediterranean Sea north west of Cape Bougaroni, Algeria by SMU U-65 (Germany).
 * Caliban ( undefined): World War I: The trawler was shelled and sunk in the North Sea 45 nmi north east by east of Rattray Head, Aberdeenshire by SMU UC-76 . Her crew survived.
 * Chinkiang ( undefined): World War I: The trawler was shelled and sunk in the North Sea 30 nmi north east by east of Buchan Ness, Aberdeenshire by SMU UC-76 . Her crew survived.
 * Crown Prince ( undefined): World War I: The trawler was shelled and sunk in the North Sea 45 nmi north east by east of Girdle Ness by SMU UC-76 . Her crew survived.
 * Dina Henderika (🇳🇱 Netherlands): World War I: The sailing vessel was scuttled in the North Sea 30 nmi east north east of Hartlepool, County Durham, United Kingdom by SMU UC-30.
 * Edelweiss (🇫🇷 France): World War I: The sailing vessel was shelled and sunk in the English Channel off Cherbourg, Seine-Maritime by SMU UC-71.
 * Equerry ( undefined): World War I: The trawler was shelled and sunk in the North Sea 35 nmi north east of Kincaid Head by SMU UC-76 . Her crew survived.
 * Ernst Sophie ( undefined): World War I: The sailing vessel was scuttled in the Atlantic Ocean south west of Ireland (51.08333°N, -11.96667°W) by SMU UC-27.
 * Fife Ness ( undefined): World War I: The fishing vessel was shelled and sunk in the North Sea 23 nmi east north east of Fraserburgh, Aberdeenshire by SMU UC-76 . Her crew survived.
 * SS Glencliffe (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 2.5 nmi off Tabarka Island, Alicante, Spain (38.11667°N, -0.36667°W) by SMU U-52 with the loss of a crew member. Three survivors were taken as prisoners of war.
 * SS India (1899) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea east of Gibraltar by SMU U-35 (Germany).
 * SS Kildale (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 40 nmi east of Pantelleria, Italy (36.73333°N, 12.53333°W) SMU U-32 (Germany) with the loss of a crew member.
 * SS Kolaastind (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea (60.23333°N, 2.7°W) by SMU U-30 (Germany) with the loss of four crew.
 * Largo Bay ( undefined): World War I: The trawler was shelled and sunk in the North Sea 30 nmi north east by east of Buchan Ness by SMU UC-76 . Her crew survived.
 * Lilian ( undefined): World War I: The trawler was shelled and sunk in the North Sea 45 nmi north east by east of Girdle Ness by SMU UC-76 . Her crew survived.
 * SS Lismore (1905) ( undefined): World War I: The passenger ship was torpedoed and sunk in the English Channel 22 nmi north west by north of Le Havre, Seine-Maritime, France (49.8°N, -0.3°W) by SMU UB-38 with the loss of five lives.
 * Neptunus (🇳🇱 Netherlands): World War I: The sailing vessel was sunk in the North Sea 20 nmi east north east of Hartlepool by SMU UC-30.
 * SS Niritos (1906) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 5 nmi off Augusta, Sicily, Italy (37.21667°N, 15.33333°W) by SMU U-27 (Austria-Hungary).
 * Osprey ( undefined): World War I: The trawler was shelled and sunk in the North Sea 45 nmi north east by east of Girdle Ness by SMU UC-76 . Her crew survived.
 * SS Toro (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 200 nmi west north west of Ouessant, Finistère, France (48.5°N, -10°W) by SMU U-55 with the loss of fourteen crew. Two survivors were taken as prisoners of war.
 *  Union (🇩🇰 Denmark): World War I: The schooner was sunk in the North Sea 18 to 20 nmi east of the Souter Lighthouse, County Durham by SMU UC-30 . Her crew survived.
 *  Voorwarts (🇳🇱 Netherlands): World War I: The schooner was sunk in the North Sea 20 nmi east north east of Hartlepool by SMU UC-30.

13 April

 * SS Argyll (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 110 nmi west of the Bishop Rock, Isles of Scilly (49.38333°N, -9.11667°W) by SMU U-84 with the loss of 22 of her crew.
 * SS Bandon (1910) ( undefined): World War I: The cargo ship struck a mine and sank in the Atlantic Ocean 2.5 nmi south west of Mine Head, Cornwall (51.95°N, -7.58333°W) with the loss of 28 of her crew.
 * SS Bokn (1901) (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea 95 nmi off the Hellisøy Lighthouse, Hordaland (60.06667°N, 0.75°W) by SMU U-30 (Germany) . Her crew survived.
 * SS Frixos (1888) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 60 nmi east of the Shetland Islands, United Kingdom (60.06667°N, 0.75°W) by SMU U-30 (Germany).
 * SS Gama (1910) (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea (60.4°N, 1.25°W) by SMU U-30 (Germany) . Her crew survived.
 * Gambetta (🇫🇷 France): The sailing vessel was sunk in the Bay of Biscay off the Île d'Yeu, Finistère by SMU UC-26.
 * SS Giuseppe Accame (1899) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea 40 nmi west of Cape Spartel, Morocco by SMU U-35 (Germany).
 *  Glenlora (🇳🇴 Norway): World War I: The barque was sunk in the North Sea (60.6°N, 1.88333°W) by SMU U-30 (Germany) . Her crew survived.
 * SS Kariba (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 260 nmi west nort west of Ouessant, Finistère, France (48.5°N, -11.46667°W) by SMU UC-27 with the loss of thirteen of her crew.
 *  Maria ( undefined): World War I: The schooner was scuttled in the English Channel 25 nmi south west of Portland Bill, Dorset by SMU UB-38 . Her crew survived.
 * HMML 534 : World War I: The motor launch was lost in the Mediterranean Sea on this date.
 * SS Odysseus (4531) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea 30 nmi west of Cape Spartel by SMU U-35 (Germany).
 * HMT Pitstruan : World War I: The naval trawler struck a mine and sank in the North Sea 3 nmi south east of the Noss Head Lighthouse, Shetland Islands with the loss of eleven of her crew.
 * Stork ( undefined): World War I: The trawler was scuttled in the North Sea 20 nmi east of St Abb's Head, Berwickshire by SMU UC-41 . Her crew survived.
 * SS Strathcona (1900) (🇨🇦 Canada): World War I: The cargo ship was scuttled in the Atlantic Ocean 145 nmi west north west of Ronaldsay, Orkney Islands, United Kingdom (59.58333°N, -5.81667°W) by SMU U-78 with the loss of nine crew. Three survivors were taken as prisoners of war.
 * SS Stromboli (1914) ( undefined): The cargo ship was sunk in the Mediterranean Sea 50 nmi west of Cape Spartel by SMU U-35 (Germany).
 * SS Zara (1897) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 90 nmi off the Hellisøy Lighthouse (60.13333°N, 1.86667°W) by SMU U-30 (Germany) with the loss of 27 lives.

14 April

 * HMT Alberta : World War I: The naval trawler struck a mine and sank in the North Sea off Grimsby, Lincolnshire (53.75°N, 0.85°W) with the loss of seven of her crew.
 * Andromach ( undefined): World War I: The trawler was scuttled in the Atlantic Ocean west of the Shetland Islands by SMU U-78 . Her captain was taken as a prisoner of war. The other eleven crew took to the lifeboat but were not found.
 * Cinque Ottobre ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of Tunisia by SMU UC-20.
 * SS Fjeldli (🇳🇴 Norway): World War I: The coaster was sunk in the North Sea 76 nmi west by north of the Marstein Lighthouse, Hordaland (60.03333°N, 2.16667°W) by SMU U-30 (Germany) . Her crew survived.
 * SS Gange (1905) : World War I: The troopship struck a mine and sank in the Mediterranean Sea 33 nmi north east of Cape Serrat, Algeria (37.4°N, 9.83333°W) by SMU UC-37 with the loss of one life.
 * SS Hermione (1891) ( undefined): World War I: The cargo ship struck a mine and was damaged in the Irish Sea off the Coningbeg Lightship ( undefined). She was beached in Dunmore Bay where she was declared a constructive total loss. Subsequently scrapped in situ.
 * HMT Orcades : World War I: The naval trawler struck a mine and sank in the North Sea off Grimsby with the loss of six of her crew.
 * SS Patagonier (1910) ( undefined): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 135 nmi) west of Gibraltar (36°N, -9°W) by SMU U-35 (Germany) . Her crew survived.
 * ST Progresso ( undefined): World War I: The tug was sunk in the Mediterranean Sea off the coast of Tunisia by SMU UC-20.
 * SS Spray (1891) ( undefined): World War I: The cargo ship was sunk in the North Sea 3.5 nmi north east of the mouth of the River Tyne by SMU UC-30 . Her crew survived.
 * SS Tom (1896) (🇪🇸 Spain): World War I: The cargo ship was sunk in the Bay of Biscay 12 nmi off Hourtin, Gironde, France (45.08333°N, -1.5°W) by SMU UC-26 . Her crew survived.
 * Tres Macs (🇵🇹 Portugal): World War I: The auxiliary sailing vessel was shelled and sunk in the Mediterranean Sea (36.65°N, -7.36667°W) by SMU U-52.
 * SS Venus (1872) (🇳🇴 Norway): World War I: The coaster struck a mine and sank in the North Sea 5 nmi off Berwick-upon-Tweed, Northumberland, United Kingdom with the loss of fourteen of her crew.
 * HMS Veronica (1915) The Acacia-class sloop was damaged in the Mediterranean Sea 45 nmi north west of Alexandria, Egypt (31.71667°N, 29.28333°W) by SMU UB-42.

15 April

 * SS Alert (1911) ( undefined): World War I: The coaster struck a mine and sank in the English Channel off Dover, Kent.
 * Alessio Cocco ( undefined): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of Tunisia by SMU UC-20.
 * SS Arcadian (1899) ( undefined): World War I: The troopship was torpedoed and sunk in the Mediterranean Sea 26 nmi north east of Milos, Greece (36.83333°N, 24.83333°W) by SMU UC-74 with the loss of 277 lives.
 *  Astræa (🇩🇰 Denmark): World War I: The barquentine was set afire and sunk in the Atlantic Ocean south west of the Isles of Scilly, United Kingdom (49°N, -10.5°W) by SMU U-55 with the loss of seven crew.
 * Brothertoft ( undefined): World War I: The trawler was sunk in the North Sea (approximately 55.83333°N, 1.5°W) by SMU UC-30.
 * SS Cameronia (1911) ( undefined): World War I: The troopship was torpedoed and sunk in the Mediterranean Sea 150 nmi east of Malta (35.83333°N, 17.53333°W) by SMU U-33 with the loss of 140-210 of the 2,650-plus people on board. Survivors were rescued by HMS Nemesis (1910) and HMS Rifleman (1910) (both ).
 * Dalmatian ( undefined): World War I: The trawler was scuttled in the North Sea by SMU UC-44 . Her nine crew took to the lifeboats but did not survive.
 *  Fram (🇩🇰 Denmark): World War I: The schooner was shelled and sunk in the North Sea (56.58333°N, -2.75°W) by SMU U-93.
 * SS Gretaston (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean (43.13333°N, -11.53333°W) by SMU UC-27 with the loss of all 29 crew.
 * Heikina (🇳🇱 Netherlands): World War I: The sailing vessel was sunk in the North Sea by SMU UC-44 . Her crew took to the lifeboats but did not survive.
 * SS Mashobra (1914) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Mediterranean Sea 140 nmi south west of Cape Matapan, Greece (35.56667°N, 20.66667°W) by SMU U-28 (Austria-Hungary) with the loss of eight lives. Her captain was taken as a prisoner of war.
 * SS Møhlenpris (1884) (🇳🇴 Norway): World War I: The coaster was sunk in the English Channel 15 nmi south west of Beachy Head, East Sussex, United Kingdom (50.63333°N, -0.25°W) by SMU UB-40 . Her crew survived.
 * SS Panaghi Drakatos (1897) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Atlantic Ocean 26 nmi off Cape Santa Maria, Portugal by SMU U-35 (Germany) . Her crew survived.
 * SS Paris (1910) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 100 nmi west of Greipengen by SMU U-30 (Germany) . Her crew survived.
 * USS Pike (SS-6) : The Plunger-class submarine sank at Cavite Naval Base, Philippines. She was raised two days later, repaired and returned to service.
 * Sutterton ( undefined): World War I: The trawler was scuttled in the North Sea 65 nmi east south east of St Abb's Head, Berwickshire (55.75°N, -0.25°W) by SMU UC-44 with the loss of a crew member.
 * SS Tusnastabb (1892) (🇳🇴 Norway): World War I: The coaster struck a mine and sank in the English Channel off Cap Gris Nez, Pas-de-Calais, France (50.9°N, 1.56667°W). Her crew survived.

Unknown date

 * Agia (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of North Africa by SMU UC-22.
 * Evangelistria (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of North Africa by SMU UC-22.
 * Kyriotis (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of North Africa by SMU UC-22 . Her crew survived.