List of shipwrecks in April 1945

The list of shipwrecks in April 1945 includes ships sunk, foundered, grounded, or otherwise lost during April 1945.

1 April

 * SS Armenier (🇬🇧 United Kingdom): World War II: The cargo ship was scuttled or beached off Littlehampton, West Sussex.
 * MV Awa Maru (1943) (🇯🇵 Japan): World War II: The ocean liner was torpedoed and sunk by USS Queenfish (SS-393) whilst under Allied escort. There was only one survivor of the 2,005 people on board.
 * GS U-747 : World War II: The Type VIIC submarine was bombed and destroyed at Hamburg in an American air raid.
 * GS U-1131 : World War II: The Type VIIc submarine was bombed and damaged at Hamburg in an American air raid. She was consequently scuttled due to damage received.

2 April

 * JAPANESE ESCORT CD-186 : World War II: The Coast Defence Frigate was sunk  south west of Amami Ōshima in the East China Sea (28.11667°N, 129.15°W) by U.S. Navy aircraft from Task Force 58.
 * MV Concordia (1940) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in Sognefjord by Royal Air Force aircraft. Later raised, repaired and returned to service.
 * USS Dickerson (DD-157) : World War II: The High Speed Transport, a former, was damaged in the Pacific Ocean off Okinawa, Japan by a kamikaze attack with the loss of 54 of her 101 crew. The ship was scuttled off Kerama Retto on 4 April.
 * SS Edogawa Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea (34.03333°N, 124°W) by USS Sea Devil (SS-400) . Lost with all 48 crew.
 * SS Nisshin Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea (34.03333°N, 124°W) by USS Sea Devil (SS-400) . 39 crew 9 Gunners killed.
 * SS Taijo Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea (34.03333°N, 124°W) by USS Sea Devil (SS-400) . 39 crew 9 Gunners killed.
 * JAPANESE FAST TRANSPORT Transport No. 17 : World War II: The was sunk  south west of Amami Ōshima in the East China Sea (28.11667°N, 129.15°W) by U.S. Navy aircraft from Task Force 58.
 * JAPANESE LANDING SHIP Transport No. 145 : World War II: The was sunk  south west of Amami Ōshima in the East China Sea (28.11667°N, 129.15°W) by U.S. Navy aircraft from Task Force 58.
 * GS U-321 : World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean south west of Ireland by a Vickers Wellington aircraft of 304 Squadron, Royal Air Force with the loss of all 41 crew.
 * SS William Blumer (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in Sognefjord by Royal Air Force aircraft. She was raised on 12 October 1946, repaired and returned to service in April 1948 as William.

3 April

 * SS Axenfels (1944) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft at Kiel, Germany. Wreck scrapped in March 1948 at Blyth, England.
 * Brummer : World War II: The minelayer was wrecked in a Royal Air Force air raid on Kiel, Schleswig-Holstein.
 * JAPANESE TRANSPORT Heikai Maru : World War II: The Transport was bombed and sunk at Hong Kong (22.28333°N, 114.16667°W)  by Far East Air Force B-24s. 1 crewman killed.
 * GERMAN MINESWEEPER M-802 : World War II: The minesweeper was bombed and sunk by aircraft at Kiel, Germany.
 * MS Monte Olivia (1924) (🇩🇪 Germany): World War II: The passenger/cargo ship was bombed and sunk at Kiel, Germany.
 * SS New York (1926) (🇩🇪 Germany): World War II: The passenger liner was bombed and sunk by aircraft at Kiel, Germany. Wreck scrapped from 2 August 1949 at Dalmuir, Scotland, and from January 1950 at Troon, Scotland.
 * JAPANESE TRANSPORT Shozan Maru : World War II: The Transport was bombed and sunk at Hong Kong (22.28333°N, 114.16667°W)  by Far East Air Force B-24s. 8 crewmen killed.
 * GS U-1221 : World War II: The Type IXC/40 submarine was bombed and sunk at Kiel in an American air raid with the loss of seven of the eighteen crew on board at the time.
 * GS U-2542 : World War II: The Type XXI submarine was bombed and sunk at Kiel. The wreck was scrapped post-war.
 * GS U-3505 : World War II: The Type XXI submarine was bombed and sunk at Kiel with the loss of one crew member. The wreck was scrapped post-war.
 * USS YMS-71 : The minesweeper was  sunk by a mine in the Celebes Sea off Sanga Sanga, Philippine Islands(4.98333°N, 119.78333°W).

4 April

 * SS Feodosia (1922) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft in the Kattegat.
 * JAPANESE ESCORT Mokuto : World War II: The was mined and sunk in the Shimonoseki Strait (33.88333°N, 131.05°W) . 27 Crewmen killed.
 * USS LCI(G)-82 (LCI(G)-82) : World War II: The Landing Craft, Infantry(Gun) was sunk off Buckner Bay Okinawa by Japanese Assault Demolition Boats.
 * USS LSM-12 (LSM-12) : World War II: The Landing Ship, Medium was wrecked and abandond at Okinawa, stripped for parts.
 * USS LST-675 (LST-675) : World War II: The Landing Ship, Tank was wrecked and abandoned at Okinawa, stripped for parts.
 * GS U-237 : World War II: The Type VIIC submarine was bombed and sunk at Kiel, Schleswig-Holstein in a British air raid with the loss of one crew member.
 * GS U-749 : World War II: The Type VIIC submarine was bombed and sunk at Kiel in an American air raid with the loss of two crew.
 * GS U-3003 : World War II: The Type XXI submarine was bombed and sunk at Kiel. The wreck was scrapped post-war.

5 April

 * SS Gasray (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the North Sea 2 nmi north of St Abb's Head, Berwickshire by GS U-2321 with the loss of eight of her 24 crew. Survivors were rescued by the MV Clova (1937) (🇬🇧 United Kingdom) and the St Abb's lifeboat (RNLI FLAG.png) Royal National Lifeboat Institution).
 * JAPANESE OILER Kamoi (🇯🇵 Japan): World War II: The Oiler was bombed and damaged by US Army Far East Air Force B-24s at Hong Kong. She sinks on the 8th in very shallow waters and the crew doesn't abandon her until the 13th.
 * JAPANESE CARGO SHIP Kine Maru : World War II: The Cargo ship was bombed and sunk by USN PBM Mariners (22.4°N, 115.46667°W). 56 passengers, 5 Gunners and 19 crew members were lost.
 * JAPANESE SUBMARINE Ro-49 : World War II: The Kaichū type submarine was depth charged and sunk in the Pacific Ocean off Okinawa by USS Hudson (DD-475).
 * USS Thornton (DD-270) : The Seaplane Tender, a former, collided with USS Ashtabula (AO-51) and USS Escalante (AO-71) in the Pacific Ocean off the Ryuku Islands and was severely damaged. She was beached and abandoned at Keramo Retto on 2 May.
 * JAPANESE CARGO SHIP Tokai Maru No. 2 (🇯🇵 Japan): World War II: The Cargo ship was bombed and sunk by 5th Air Force B-24s, B-26s and P-38s (22.4°N, 116.16667°W). 16 Gunners and 13 crew members were lost.
 * SS Torridal (1930) (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk at Folda, Nord-Trøndelag by HNOMS Utsira (P-85) with the loss of fifteen of her eighteen crew.
 * GS U-242 : World War II: The Type VIIC submarine struck a mine and sank in St George's Channel (52.04833°N, -5.78°W) with the loss of all 44 crew.
 * GS U-677 : World War II: The Type VIIC submarine was destroyed at Hamburg in a British air raid.

6 April

 * JAPANESE DESTROYER Amatsukaze : World War II: The was bombed and damaged in the Formosa Strait 6 nmi east of Amoy, China by North American B-25 Mitchell aircraft of the United States Army Air Forces. She was beached but salvage was abandoned two days later and she was scuttled on 10 April.
 * USS Bush (DD-529) : World War II: The was sunk in a Japanese kamikaze attack in the Pacific Ocean off Okinawa, Japan (27.26667°N, 127.8°W) with the loss of 87 of her 314 crew.
 * JAPANESE ESCORT CD-1 : World War II: Convoy HOMO-03: The Coast Defence Frigate was sunk  south west of Amoy in the Fotou Bay, China Formosa Strait(23.91667°N, 117.66667°W) by U.S. Army B-25s of the 345th Bomb Group.
 * JAPANESE ESCORT CD-134 : World War II: Convoy HOMO-03: The Coast Defence Frigate was sunk  south west of Amoy in the Fotou Bay, China Formosa Strait (23.91667°N, 117.66667°W) by U.S. Army B-25s of the 345th Bomb Group.
 * USS Colhoun (DD-801) : World War II: The was sunk  in the Pacific Ocean off Okinawa (27.26667°N, 127.8°W) by a Japanese kamikaze attack when hit by 4 aircraft. 35 crewmen killed.
 * SS Cuba (1923) (🇬🇧 United Kingdom): World War II: Convoy VWP-16: The troopship was torpedoed and sunk in the English Channel south east of the Isle of Wight (50.6°N, -0.96667°W) by GS U-1195 with the loss of one of the 265 people on board. Survivors were rescued by HMCS Nene (K270).
 * USS Emmons (DD-457) : World War II: The High Speed Minesweeper, a former, was damaged in a Japanese kamikaze attack in the Pacific Ocean off Okinawa (26.8°N, 128.06667°W) . She was scuttled the next day with the loss of 60 of her 208 crew.
 * SS Hobbs Victory (🇺🇸 United States): World War II: The Victory ship damaged in a Japanese kamikaze attack at Okinawa, Japan (25.83333°N, 127.23333°W). She exploded and sank the next day. Survivors were rescued by USS Serene (AM-300) and USS Success (AM-310) (both ).
 * USS LST-447 : World War II: The was damaged at Kerama Retto (26.15°N, 127.3°W) in a Japanese kamikaze attack. She sank the next day.
 * USS Leutze (DD-481) : World War II: The was damaged in a Japanese kamikaze attack. She was consequently declared a constructive total loss.
 * SS Logan Victory (🇺🇸 United States): World War II: The Victory ship was sunk by a Japanese Kamikaze attack.
 * SS Marco Brunner (🇩🇪 Germany): World War II: The troopship was sunk off Väderöarna, Sweden, with the loss of around 700 from the 1,200 people on board.
 * USS Morris (DD-417) : World War II: The was damaged in a Japanese kamikaze attack by a Nakajima B5N aircraft. She was consequently declared a constructive total loss.
 * USS Newcomb (DD-586) : World War II: The was damaged in a Japanese kamikaze attack. She was consequently declared a constructive total loss.
 * JAPANESE SUBMARINE RO-56 : World War II: The was depth charged and sunk off Okinodaito-Jima, Ryuku (26.15°N, 130.35°W),   by USS Mertz (DD-691) and USS Monssen (DD-798)  both.
 * JAPANESE MINESWEEPER W-12 : World War II: The was torpedoed and damaged off Komodo Island and beached (8.21667°N, 119.23333°W), torpedoed again and sunk  by USS Besugo (SS-321)'''.

7 April

 * JAPANESE DESTROYER Asashimo : World War II: Operation Ten-Go: The was torpeded and sunk in the Pacific Ocean 150 nmi south west of Nagasaki approximately 38°N, 128°W by aircraft based on USS San Jacinto (CVL-30)  with the loss of all 328 crew.
 * MS Flensburg (1939) (🇩🇪 Germany): World War II: The incomplete cargo ship was bombed and sunk at Pillau, East Prussia.
 * JAPANESE DESTROYER Hamakaze : World War II: Operation Ten-Go: The was torpedoed and sunk in the Pacific Ocean 150 nmi south west of Nagasaki (30.78333°N, 128.13333°W) by aircraft based on USS San Jacinto (CVL-30).
 * JAPANESE DESTROYER Isokaze : World War II: The was damaged in the Pacific Ocean by aircraft of Task Force 58, United States Navy. She was scuttled with the loss of twenty of her 239 crew.
 * JAPANESE CRUISER Isuzu : World War II: The was torpedoed and damaged in the Java Sea 80 nmi north west of Bima, Dutch East Indies by USS Gabilan (SS-252) . She was then torpedoed and sunk by USS Charr (SS-328)  at -7.63333°N, 118.15°W.
 * SS James W. Nesmith (🇺🇸 United States): World War II: Convoy HX 346: The Liberty ship was torpedoed and damaged in the Irish Sea (53.4°N, -4.8°W) by GS U-1024 . All 82 people on board survived. She was beached at Holyhead, Anglesey, United Kingdom but was declared a constructive total loss.
 * JAPANESE DESTROYER Kasumi : World War II: Operation Ten-Go: The was bombed and damaged in the Pacific Ocean 150 nmi south west of Nagasaki (approximately 38°N, 128°W by USN aircraft. Scuttled by JAPANESE DESTROYER Fuyuzuki  with the loss of 17 crewmen killed and 47 wounded.
 * HMS MTB 494 (MTB494) : World War II: The  was rammed and sunk in the North Sea by a Schnellboot.
 * HMS MTB 5001 (MTB5001) : World War II: The  was sunk in the North Sea by gunfire by a Schnellboot.
 * Oldenburg (🇩🇪 Germany): World War II: The cargo ship was sunk off Vadheim, Sogn og Fjordane Norway by Allied aircraft.
 * PGM-18 : World War II: The  was mined in Buckner Bay Okinawa and sank with a loss of 13 crew.
 * GS U-1195 : World War II: The Type VIIC submarine was depth charged and sunk in the English Channel south east of the Isle of Wight (50.55472°N, -0.93583°W) by HMS Watchman (D26) with the loss of all 50 crew.
 * USS YMS-103 (YMS-103) : The minesweeper was damaged by a mine off Okinawa(26.21667°N, 127.9°W) . Beached and abandoned the next day.
 * JAPANESE CRUISER Yahagi : World War II: Operation Ten-Go: The was bombed, torpedoed and sunk in the Pacific Ocean south of Kyushu, Japan by United States Navy aircraft.
 * JAPANESE BATTLESHIP Yamato : World War II: Operation Ten-Go: The was bombed, torpedoed and sunk in the Pacific Ocean south of Kyushu by United States Navy aircraft with the loss of 2,055 of her 2,332 crew.

8 April

 * SS Albert (1887) (🇩🇪 Germany): World War II: The cargo ship was bombed and wrecked by aircraft at Hamburg, Germany. Wreck scrapped in January 1950.
 * Boelcke : World War II: The was sunk by Soviet aircraft.
 * GERMAN AUXILIARY SHIP Franken : World War II: The auxiliary ship was bombed and sunk by Soviet bombers off Hela, Danzig-West Prussia.
 * Hans Albrecht Wedel : World War II: The was sunk by Soviet aircraft.
 * GS U-774 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north west of Ireland (49.96667°N, -11.85°W) by HMS Bentinck (K314) and HMS Calder (K349) (both ) with the loss of all 44 crew.
 * GS U-1001 : World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean south west of Land's End, Cornwall, United Kingdom (49.31667°N, -10.38333°W) by HMS Byron (K508) and HMS Fitzroy (K553) (both ) with the loss of all 46 crew.
 * GS U-2509 : World War II: The Type XXI submarine was bombed and sunk at Hamburg in a Royal Air Force air raid.
 * GS U-2514 : World War II: The Type XXI submarine was bombed and sunk at Hamburg in a Royal Air Force air raid.
 * GS U-3512 : World War II: The Type XXI submarine was bombed and sunk at Kiel in an Allied air raid.
 * GERMAN FLEET TENDER Wilhelm Bauer : World War II: The submarine tender was bombed and sunk by aircraft.

9 April

 * Admiral Scheer : World War II: The was sunk in a Royal Air Force air raid on Kiel, Schleswig-Holstein.
 * SS Carsten Russ (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft in the Skagerrak.
 * SS Charles Henderson (🇺🇸 United States): The Liberty ship exploded and sank at Bari, Apulia, Italy whilst unloading her cargo of ammunition.
 * GERMAN MINESWEEPER M-19 : World War II: The minesweeper was bombed off Kiel, Germany, and was beached.
 * SS Nikko Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea north-east of Tsingtao, China (36.83333°N, 123.91667°W), by USS Tirante (SS-420) .A total of 563 passengers, 14 Gunners, 16 guard force soldiers, 2 Signalers, and 73 crewmen were killed
 * SS Rosnaes (🇩🇰 Denmark): World War II: The cargo ship was seized by the Danish Resistance off Copenhagen and ran aground on Ven, Sweden. She was refloated and taken to Landskrona. Nineteen other Danish vessels were also seized and taken to Sweden to prevent their capture by German forces.
 * SS Samida (🇬🇧 United Kingdom): World War II: The Liberty ship was torpedoed and sunk in the English Channel off Dungeness, Kent by a Kriegsmarine submarine.
 * SS St. Mihiel (🇺🇸 United States): World War II: Convoy CU 65: The cargo ship collided with SS Nashbulk (🇺🇸 United States) in the Atlantic Ocean caught fire and was abandoned.
 * GS U-804 : World War II: The Type IXC/40 submarine was sunk in the Kattegat off Gothenburg, Sweden (57.96667°N, 11.25°W) by de Havilland Mosquito aircraft of 143 Squadron and 235 Squadron, Royal Air Force with the loss of all 55 crew.
 * GS U-843 : World War II: The Type IXC/40 submarine was sunk in the Kattegat west of Gothenburg (57.53333°N, 11.38333°W) by a rocket attack by de Havilland Mosquito aircraft of 235 Squadron, Royal Air Force with the loss of 44 of her 56 crew.
 * GS U-982 : World War II: The Type VIIC submarine was bombed and destroyed at Hamburg in a Royal Air Force air raid.
 * GS U-1065 : World War II: The Type VIIC/41 submarine was sunk in the Skaggerak (57.96667°N, 11.25°W by a rocket attack by de Havilland Mosquito aircraft of 143 and 235 Squadrons, Royal Air Force with the loss of all 45 crew.
 * GS U-2516 : World War II: The Type XXI submarine was sunk at Kiel in an Allied air raid. The wreck was scrapped post-war.
 * JAPANESE MINESWEEPER W-3 : World War II: The was torpedoed and sunk off Ofunato (-39.11667°N, 141.95°W),   by USS Parche (SS-384)'''.

10 April

 * SS Hansa I (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk off Gothenburg, Sweden.
 * Seydlitz : World War II: The was scuttled at Kiel, Schleswig-Holstein.
 * SS Ilmenau (1922) (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk by a submarine west of Libau, Latvia.
 * HMS MTB 710 (MTB710) : World War II: The  was sunk by a mine off Zara Italy.
 * SS Neuwerk (1912) (🇩🇪 Germany): World War II: The refugee ship was torpedoed and sunk off the Hel Peninsula, Poland.
 * GERMAN TORPEDO BOAT T-1 : World War II: The torpedo boat was bombed and sunk by aircraft while docked at the Deutsche Werke yard in Kiel, Germany.
 * GERMAN TORPEDO BOAT T-13 : World War II: The torpedo boat was bombed and sunk by aircraft in the Kattegat.
 * GS U-878 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Bay of Biscay west of Saint-Nazaire, Loire-Atlantique, France (47.58333°N, -10.55°W) by HMS Tintagel Castle (K399) and HMS Vanquisher (D54) (both ) with the loss of all 51 crew.

11 April

 * JAPANESE AUXILIARY NET LAYER Agata Maru : World War II: The Auxiliary Net Layer  was sunk east of Car Nicobar in the Andaman Sea (8.91667°N, 98.63333°W) by Royal Air Force B-24s of 203 Squadron.
 * JAPANESE SUBMARINE TENDER CH-7 : World War II: The  was sunk east of Car Nicobar in the Andaman Sea (8.91667°N, 98.63333°W) by Royal Air Force B-24s of 203 Squadron.
 * SS Moltkefels (1939) (🇩🇪 Germany): World War II: The cargo ship was bombed by aircraft off Hela, occupied Poland, and beached.
 * SS Posen (1925) : World War II: The cargo ship was bombed and sunk by aircraft off Hela, occupied Poland.
 * GERMAN MINESWEEPER TS-10 : World War II: The minesweeper was bombed and sunk by aircraft off Hela, occupied Poland.

12 April

 * SS Dione (1940) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk at Porsgrunn, Telemark by Allied aircraft. Raised post-war, repaired and returned to service in April 1946.
 * SS Kalmar (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk at Porsgrunn by Allied aircraft.
 * USS LCS(L)-33 : World War II: The was sunk off Okinawa by Kamakazes.
 * USS LCT-66 : World War II: The was lost at Pearl Harbor Hawaii.
 * USS LST-493 : World War II: The ran aground and sank off Plymouth, England (50.33333°N, -4.15°W).
 * USS Mannert L. Abele (DD-733) : World War II: The was sunk in the Pacific Ocean 70 nmi north west of Okinawa, Japan (27.25°N, 136.5°W) by a Japanese kamikaze attack using an Aichi D3A or Yokosuka MXY7 Ohka aircraft. Survivors were rescued by USS LSM(R)-189 and USS LSM(R)-190 (both ).
 * SS Nordsjø (🇳🇴 Norway): World War II: The coaster was bombed and sunk a Porgsrunn by Allied aircraft. Raised post-war, repaired and returned to service.
 * JAPANESE SUBMARINE RO-64 : World War II: The was sunk in Hiroshima Bay, Japan by a mine while on a training mission. 50 crewmen, 30 students and ComSubDiv 33's C.O. were killed.
 * SS Traust (🇳🇴 Norway): World War II: The coaster was bombed and sunk a Porgsrunn by Allied aircraft. Raised post-war, repaired and returned to service.
 * GS U-486 : World War II: The Type VIIC submarine was torpedoed and sunk in the North Sea north west of Bergen, Hordaland, Norway (60.73333°N, 4.65°W) by HMS Tapir (P335) with the loss of all 48 crew.
 * GS U-1024 : World War II: The Type VIIC/41 submarine was damaged in the Irish Sea south of the Isle of Man (53.65°N, -5.05°W by a Squid attack by HMS Loch Glendhu (K619) and HMS Loch More (K639) (both ) with the loss of nine of her 46 crew. U-1024 was taken in tow by HMS Loch More but foundered the next day.
 * SS Weserstein (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Pillau, East Prussia.
 * SS Will Rogers (🇺🇸 United States): World War II: Convoy BB 80: The Liberty ship was torpedoed and damaged in the Irish Sea south west of Holyhead, Anglesey, United Kingdom (53.8°N, -4.76667°W) by GS U-1024 . She was beached at Holyhead. Later repaired and returned to service on 1 December 1945.

13 April

 * SS Karlsruhe (1905) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by Soviet aircraft off the Hel Peninsula, Poland.
 * GERMAN TORPEDO BOAT T-16 : World War II: The torpedo boat was bombed and sunk by aircraft at Fredrikshavn, Denmark.
 * GERMAN TORPEDO BOAT TA-45 : World War II: The, was sunk by Royal Navy MTBs in the Adriatic Sea.

14 April

 * MV Belgian Airman (🇧🇪 Belgium): World War II: The cargo ship was torpedoed and sunk off Chesapeake Bay, Maryland, United States (36.15°N, -75.08333°W) by GS U-857 with the loss of one of her 47 crew. Survivors were rescued by SS Harold A. Jordan (🇺🇸 United States).
 * JAPANESE ESCORT CD-31 : World War II: The Coast Defence Frigate was torpedoed and sunk in Hiyo Inlet, Saishu Island (33.41667°N, 126.25°W),   by USS Tirante (SS-420)  . Sank in shallow water and only partially submerged. 39 crewmen killed.
 * Juzan Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in Hiyo Inlet, Saishu Island (33.41667°N, 126.25°W),   by USS Tirante (SS-420)  . 33 crewmen killed.
 * JAPANESE ESCORT Nomi : World War II: The was torpedoed and sunk in Hiyo Inlet, Saishu Island (33.41667°N, 126.25°W),   by USS Tirante (SS-420)  . Sank in shallow water and only partially submerged. 134 crewmen killed including the C.O.
 * GS U-235 : World War II: The Type VIIC submarine was depth charged and sunk in the Kattegat (57.73333°N, 10.65°W by GERMAN TORPEDO BOAT T17 with the loss of all 47 crew.
 * GS U-1206 : The Type VIIC submarine was lost in the North Sea (57.4°N, -1.61667°W) in a diving accident with the loss of four of her 50 crew.

15 April

 * HMS Ekins (K552) : World War II: The Captain-class frigate was severely damaged by a mine in the North Sea. Declared a total constructive loss.
 * GERMAN MINESWEEPER M-368 : The minesweeper was sunk in a collision with a U-boat off Southern Norway.
 * GS U-103 (1940) : World War II: The decommissioned Type IXB submarine was bombed and sunk at Kiel, Schleswig-Holstein in an air raid with the loss of one life.
 * GS U-285 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Ireland (50.21667°N, -12.8°W) by HMS Grindall (K477) and HMS Keats (K482) (both ) with the loss of all 44 crew.
 * GS U-1063 : World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean off Land's End, Cornwall, United Kingdom (50.14833°N, -3.89°W) by HMS Loch Killin (K391) with the loss of 29 of her 46 crew.
 * GS U-1235 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean by USS Frost (DE-144) and USS Stanton (DE-247) (both ) with the loss of all 57 crew.
 * GERMAN PATROL BOAT Vs-58 : The patrol boat struck a mine and sank in the Baltic Sea north-east of Kiel, Germany (54.53333°N, 10.63333°W).

16 April

 * SS Cap Guir (🇩🇪 Germany): World War II: The cargo ship was sunk by air-dropped torpedo off Öland, Sweden.
 * HMCS Esquimalt (J272) : World War II: The was torpedoed and sunk in the Atlantic Ocean off Chebucto Head, Nova Scotia by GS U-190 ( with the loss of 44 of her 71 crew. She was the last Canadian warship sunk during the war.
 * MV Goya : World War II: Evacuation of East Prussia: The transport ship was torpedoed and damaged in the Baltic Sea north of Hela by SOVIET SUBMARINE L-3 . She broke in two and sank the next day with the loss of between 6,220 and 7,028 lives. There were between 165 and 334 survivors.
 * Lützow : World War II: The was bombed and sunk in the Kaiserfahrt. She was raised and scrapped in 1947.
 * SS Manryu Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Japan by USS Sunfish (SS-281).
 * USS Pringle (DD-477) : World War II: The was sunk in the Pacific Ocean off Okinawa, Japan by a kamikaze aircraft attack with the loss of 78 of her 336 crew.
 * GS U-78 (1940) : World War II: The Type VIIC submarine was shelled and sunk at Pillau, East Prussia by Soviet shore-based artillery.
 * GS U-880 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean (47.3°N, -30.43333°W) by USS Frost (DE-144) and USS Stanton (DE-247) (both ) with the loss of all 49 crew.
 * GS U-1274 : World War II: The Type VIIC/41 submarine was depth charged and sunk in the North Sea north of Newcastle-upon-Tyne, Northumberland, United Kingdom (55.6°N, -1.4°W) by HMS Viceroy (L21) with the loss of all 44 crew.
 * No. 73 : World War II: The coastal defence vessel was torpedoed and sunk in the Pacific Ocean off Japan by USS Sunfish (SS-281).

17 April

 * HMS MTB 697 (MTB697) : World War II: The  was sunk by a mine in the Adriatic Sea.

18 April

 * SS Cyrus H. McCormick (🇺🇸 United States): World War II: Convoy HX 348: The Liberty ship was torpedoed and sunk in the Atlantic Ocean (48.08333°N, -6.46667°W) by GS U-1107 with the loss of six of her 53 crew. Survivors were rescued by SS Gothland (🇬🇧 United Kingdom).
 * SS Empire Gold (🇬🇧 United Kingdom): World War II: Convoy HX 348: The tanker was torpedoed and sunk in the Atlantic Ocean (47.78333°N, -6.43333°W) by GS U-1107 with the loss of 43 of her 47 crew. Survivors were rescued by SS Gothland (🇬🇧 United Kingdom).
 * SS Filleigh (🇬🇧 United Kingdom): World War II: Convoy TAM 118: The cargo ship was torpedoed and sunk in the English Channel off Dover, Kent by GS U-245.
 * JAPANESE SUBMARINE I-56 : World War II: The Type B1 submarine was sunk in the Pacific Ocean off Okinawa (26.7°N, 130.63333°W) by USS Collett (DD-730), four other destroyers (all ) and United States Navy carrier-based aircraft.
 * MV Karmt (🇳🇴 Norway): World War II: Convoy TAM 118: The cargo ship was torpedoed and sunk in the English Channel off Dover (51.45°N, 1.71667°W) by GS U-245 ( with the loss of four of her 39 crew. Survivors were rescued by HMT Sir Lancelot.
 * SS Pollux (1905) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft at Hamburg, Germany. Raised 1945 and broken up in Wales in 1947.
 * SS Swiftscout (🇺🇸 United States): World War II: The tanker was torpedoed and sunk in the Atlantic Ocean 145 nmi north east of Cape Henry, North Carolina (37.5°N, -73.05°W) by GS U-857 or GS U-879 (both ) with the loss of one of her 47 crew. Survivors were rescued by SS Chancellorsville (🇺🇸 United States).
 * SS Teizui Maru (🇯🇵 Japan): World War II: The Passenger-cargo ship was damaged by a mine dropped by a B-29 at the west entrance of the Shimoneseki Strait off Yawata, Japan (34.08333°N, 130.83333°W) and beached and abandoned.

19 April

 * ITALIAN AIRCRAFT CARRIER Aquila : The aircraft carrier was scuttled at Genoa. She was raised in 1946 and scrapped in 1952.
 * SS Dammtor (1944) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Unterelbe, Germany.
 * SS Kaiko Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Japan by USS Sunfish (SS-281).
 * GERMAN MINESWEEPER M-403 : World War II: The minesweeper was bombed, strafed and sunk by aircraft in the Kattegat, south-east of Anholt, Denmark.
 * SS Nygrunn (🇳🇴 Norway): World War II: The coaster either struck a mine, or was torpedoed and sunk in the Skaggerak off Egersund, Rogaland with the loss of seven crew.
 * SS Taisei Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Japan by USS Sunfish (SS-281).
 * USS Tolman (DM-28) : The ran aground on the Nagunna Reef, Japan. She was refloated on 25 April, repaired and returned to service.
 * GS U-251 : World War II: The Type VIIC submarine was sunk in the Kattegat (56.61667°N, 11.85°W) by a rocket attack by de Havilland Mosquito aircraft of 143, 235 and 248 Squadrons, Royal Air Force with the loss of 39 of her 43 crew.
 * GS U-548 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean south east of Halifax, Nova Scotia, Canada (36.56667°N, -74°W) by USS Buckley (DE-51) and USS Reuben James (DE-153) (both ) with the loss of all 58 crew.
 * GS U-879 : World War II: The Type IX submarine was sunk in the Atlantic Ocean (42.31667°N, -61.75°W) by USS Buckley (DE-51) and USS Reuben James (DE-153) (both ).

20 April

 * Ethel Crawford (🇬🇧 United Kingdom): World War II: The trawler struck a mine and sank in the Firth of Clyde (55.21667°N, -5.23333°W) with the loss of all ten crew.

21 April

 * GERMAN MINELAYER Ostmark : World War II: The minelayer was bombed and sunk by aircraft west of Anholt, Denmark.
 * GS U-636 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean west of Ireland (55.83333°N, -10.51667°W) by HMS Bazely (K311), HMS Bentick (K314) and HMS Drury (K316) (all ) with the loss of all 42 crew.

22 April

 * SS Idefjord (🇳🇴 Norway): World War II: Convoy PK 9: The tanker was torpedoed and damaged in the Barents Sea (69.66667°N, 33.23333°W) by GS U-997 with the loss of one crew member. Survivors abandoned ship but later reboarded her. Idefjord was taken in tow by HNOMS Karmøy and HNOMS Tromøy (both ), arriving at Murmansk, Soviet Union the next day. Later repaired and returned to service.
 * USS LCS-15 : World War II: The Landing Craft Support was sunk in the Pacific Ocean off Okinawa, Japan by a Japanese kamikaze attack. Survivors were rescued by USS Van Valkenburgh (DD-656).
 * SS Neukuhren (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Fredrikshavn, Denmark.
 * SS Onega ( Soviet Union): World War II: Convoy PK 9: The cargo ship was torpedoed and sunk in the Barents Sea (69.66667°N, 33.3°W) by GS U-997 with the loss of five of her 42 crew. Survivors were rescued by SOVIET PATROL CRAFT BO-220 and SOVIET PATROL CRAFT BO-228 (both ).
 * USS SC-1019 : World War II: The ran aground and sank in the Yucatan Channel (22.46667°N, -84.5°W)  north west of Arroyos de Mantua, Cuba.
 * SS Sverre Helmersen (🇳🇴 Norway): World War II: The Liberty ship was torpedoed and damaged in the North Sea off Ramsgate, Kent, United Kingdom by GS U-2326 . She was towed to Falmouth, Cornwall, where she was declared a total loss. Scrapped in 1948.
 * USS Swallow (AM-65) : World War II: The was sunk in the Pacific Ocean off the Ryuku Islands, Japan (26.16667°N, 127.2°W) by a kamikaze aircraft attack.
 * GS U-518 : World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean north of the Azores, Portugal (43.43333°N, -38.38333°W) by USS Carter (DE-112) and USS Neal A. Scott (DE-769) (both ) with the loss of all 56 crew.

23 April

 * USS Eagle 56 : World War II: The patrol boat was torpedoed and sunk in the Atlantic Ocean 3 nmi off Cape Elizabeth, Maine (43.55°N, -70.16667°W) by GS U-853 with the loss of 49 of her 62 crew. Survivors were rescued by USS Selfridge (DD-357).
 * SS Ingerseks (🇳🇴 Norway): World War II: The cargo ship was bombed and damaged in Risenfjord by Allied aircraft. She was declared a total loss.
 * SS John Carver (🇺🇸 United States): The Liberty ship was sunk by the explosion of her fuel tanks whilst under repair at Philadelphia, Pennsylvania. She was declared a constructive total loss, raised and scrapped.
 * SS Kruckau (1897) (🇩🇪 Germany): World War II: The cargo ship was scuttled in the Elbe, Germany.
 * SS Riverton (🇬🇧 United Kingdom): World War II: Convoy TBC 135: The cargo ship was torpedoed and damaged in the Bristol Channel off St. Ives, Cornwall (50.41667°N, -5.41667°W) by GS U-1023 with the loss of three of her 48 crew. She was beached in St. Ives Bay. Later repaired and returned to service.
 * GS U-183 : World War II: The Type IXC/40 submarine was torpedoed and sunk in the Java Sea (-4.95°N, 112.86667°W) by USS Besugo (SS-321) with the loss of 54 of her 55 crew.

24 April

 * USS Frederick C. Davis (DE-136) : World War II: Operation Teardrop: The was torpedoed and sunk in the Atlantic Ocean (43.86667°N, -40.25°W) by GS U-546  with the loss of 115 of her 209 crew.
 * SS Huelva (1944) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft west of Libau, Latvia.
 * SS Kronos (1925) (🇩🇪 Germany): World War II: The cargo ship struck a mine and sank in the Vestfjord, Norway.
 * SS Tübingen (1920) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Norway.
 * GS U-108 (1940) : End of World War II: The decommissioned Type IXB submarine was scuttled at Stettin, Pomerania.
 * GS U-546 : World War II: Operation Teardrop: The Type IXC/40 submarine was depth charged, hedgehogged and sunk in the Atlantic Ocean (43.88333°N, -40.11667°W by USS Chatelin (DE-149), USS Flaherty (DE-135), USS Hayter (DE-212), USS Hubbard (DE-311), USS Janssen (DE-396), USS Keith (DE-241), USS Neunzer (DE-150), USS Pillsbury (DE-133) and USS Varian (DE-798) (all ) with the loss of 26 of her 59 crew.

25 April

 * Graf Zeppelin : World War II: The was scuttled while incomplete at Stettin, West Pomerania. She was raised and salvaged by the Soviet Union in 1947.
 * SS Iglesias ( Nazi Germany) World War II: The cargo ship was scuttled at Genoa, Liguria Italy. She was later raised and salvaged.
 * JAPANESE SUBMARINE RO-109 : World War II: The Type KS submarine was sunk in the Pacific Ocean 165 miles south-south-west of Okino-Daito Jima (21.96667°N, 129.63333°W) by High Speed Transport USS Horace A. Bass (APD-124).
 * GERMAN TORPEDO BOAT TA32 : World War II: Radar Picket Destroyer/Torpedo Boat was scuttled at Genoa, Italy
 * GS U-326 : World War II: The Type VIIC/41 submarine was torpedoed and sunk in the Bay west of Brest, Finistère, France (48.2°N, -5.7°W) by a Consolidated B-24 Liberator aircraft of the United States Navy with the loss of all 43 crew.
 * JAPANESE MINESWEEPER W-41 : World War II: The minesweeper was torpedoed and sunk in the East China Sea by USS Cod (SS-224).

27 April

 * SS Canada Victory (🇺🇸 United States): World War II: The Victory ship was sunk in the Pacific Ocean off Okinawa, Japan (26.38333°N, 127.68333°W) by a Japanese kamikaze attack.
 * HMS Redmill (K554) : World War II: The Captain-class frigate was torpedoed and severely damaged in the Atlantic Ocean west of Ireland (54.53333°N, -10.6°W) by GS U-1105 with the loss of 32 of her 186 crew. She was towed to Lisahally, County Londonderry by HMS Rupert (K561)  but was declared a total constructive loss.
 * GERMAN MINESWEEPER Sperrbrecher 167 : World War II: The Sperrbrecher struck a mine and sank at 53.98833°N, 8.52667°W off Cuxhaven, Germany.

28 April

 * SUBMARINE CHASER CH-17 : World War II:  The  was torpedoed and sunk off Tomei Harbor, Fukue Shima, Goto Archepeligo, (32.41667°N, 128.76667°W)  by USS Springer (SS-414).
 * JAPANESE CABLE-MINELAYER Hushima : World War II: The (aka Hatushima) was torpedoed and sunk off Kii Suido south-south-east of Mikizaki, Japan (33.91667°N, 136.3°W)  by USS Sennet (SS-408).
 * USS Skylark (AM-63) : World War II: The struck two mines and sank in the Pacific Ocean off Okinawa, Japan (26.33333°N, 127.66667°W) with the loss of five of her 105 crew. Survivors were rescued by USS Tolman (DM-28).
 * NO.101 CLASS LANDING SHIP Transport No. 146 : World War II:  The  was torpedoed and sunk off Tomei Harbor, Fukue Shima, Goto Archepeligo, (32.41667°N, 128.76667°W)  by USS Trepang (SS-412).
 * GS U-56 (1938) : World War II: The Type IIC submarine was sunk in a Royal Air Force air raid on Kiel, Schleswig-Holstein with the loss of six of her 25 crew.
 * HMS BYMS 2053 (J853) : World War II: The YMS-class minesweeper struck a mine and sank off Porto Corsini, Ravenna, Italy.

29 April

 * GERMAN ESCORT SHIP F5 : World War II: The escort ship struck a mine en route from Copenhagen, Denmark, to Swinemünde, Germany. Collided with a wreck while under tow and sank.
 * JAPANESE SUBMARINE I-44 : World War II: The was deph charged, torpedoed and sunk in the Pacific Ocean 220 miles southeast of Okinawa, Japan (24.25°N, 131.26667°W) by a Grumman TBF Avenger from USS Tulagi (CVE-72).
 * MS Otome Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk by a submarine north of Matashiri Ialand.
 * SS Petropolis (1911) (🇩🇪 Germany): World War II: The cargo ship was bombed by aircraft at Hamburg, Germany. Beached at Juelsand in May 1945. Broken up in place in 1946.
 * GERMAN SUBMARINE TENDER/ SUPPLY SHIP Quito, (🇯🇵 Japan),: World War II; The Kriegsmarine Submarine Tender/supply ship (A.K.A Teiju Maru, also Kito Go) was torpedoed and sunk in the Java Sea off Tanjung Puting Borneo (-4.18333°N, 111.28333°W)  by USS Bream (SS-243).
 * GS U-286 : World War II: The Type VIIC submarine was depth charged and sunk in the Barents Sea (69.48333°N, 33.61667°W) by HMS Anguilla (K500), HMS Cotton (K510) and HMS Loch Insh (K433) (all ) with the loss of all 51 crew.
 * GS U-307 : World War II: The Type VIIC submarine was depth charged and sunk in the Barents Sea (69.4°N, 33.73333°W) by HMS Loch Insch (K433) with the loss of 37 of her 51 crew.
 * GS U-1017 : World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean north west of Ireland (56.06667°N, -11.1°W) by a Consolidated B-24 Liberator aircraft of 120 Squadron, Royal Air Force with the loss of all hands (34 known dead).

30 April

 * SS Miho Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by the submarine USS Trepang (SS-412).
 * HMS Goodall (K479) : World War II: Convoy RA 66: The was scuttled by gunfire from the frigate HMS Anguilla (K500)  in the Barents Sea. Goodall had been torpedoed and severely damaged by GS U-286  with the loss of 112 of her 156 crew on 29 April 1945.
 * TA43 : World War II: The Torpedoboot Ausland was sunk by Yugoslav artillery at Trieste, Italy.
 * GS U-879 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean east of Cape Hatteras, North Carolina, United States (36.56667°N, -74°W) by USS Bostwick (DE-103) USS Coffmann (DE-191), USS Natchez (PF-2) and USS Thomas (DE-102) (all ) with the loss of all 52 crew.
 * GS U-1107 : World War II: The Type VIIC/41 submarine was bombed and sunk in the Bay of Biscay west of Brest, Finistère, France (48°N, -6.5°W) by a Consolidated B-24 Liberator aircraft of the United States Navy with the loss of 37 crew.
 * GS U-3525 : World War II: The Type XXI submarine was bombed and damaged in the western Baltic Sea. She was consequently scuttled at Kiel, Schleswig-Holstein on 3 May.

Unknown date

 * GERMAN TRAINING SHIP Adler : World War II: The training ship was sunk by Allied bombers at Kiel.
 * SS Hummel (🇩🇪 Germany): World War II: The cargo ship was wrecked at Stettin, Germany. Wreck scuttled in 1947.
 * JAPANESE LANDING CRAFT DEPOT SHIP Kibitsu Maru : World War II: The Kibitsu Maru-class landing craft depot ship sprung a major leak near Kobe and was beached to prevent sinking sometime in April. Refloated in April and was under repair from April–July before returning to service.
 * USS Snook (SS-279) : The was lost in the South China Sea between 8 and 20 April, cause unknown.
 * GS U-59 (1939) : End of World War II: The Type IIC submarine was scuttled at Kiel.
 * GS U-246 : World War II: The Type VIIC submarine was lost on patrol in the Irish Sea south of the Isle of Man with the loss of all 48 crew.
 * GS U-396 : World War II: The Type VIIC submarine was lost on patrol with the loss of all 45 crew. Cause unknown.
 * GS U-398 : World War II: The Type VIIC submarine was lost on patrol in the Atlantic Ocean or Arctic Sea on or after 17 April with the loss of all 43 crew.
 * GS U-548 : World War II: The Type IX submarine was depth charged and sunk in the Atlantic Ocean off Cape Henry, Virginia, United States (36.56667°N, -74°W) by USS Bostwick (DE-103), USS Coffman (DE-191), USS Natchez (PF-2) and USS Thomas (DE-102) (all ). Various dates are given by different sources, 19, 29 and 30 April.
 * GS U-857 : World War II: The Type IXC/40 submarine was lost on patrol in the Atlantic Ocean off the east coast of the United States after 14 April with the loss of all 59 crew. Cause unknown.
 * GS U-1055 : World War II: The Type VIIC submarine was lost on patrol in the Atlantic Ocean or English Channel with the loss of all 49 crew. Cause unknown.