| dbp:desc
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- 0001-03-06 (xsd:gMonthDay)
- 0001-04-04 (xsd:gMonthDay)
- 0001-04-07 (xsd:gMonthDay)
- 0001-04-08 (xsd:gMonthDay)
- 0001-04-10 (xsd:gMonthDay)
- 0001-04-11 (xsd:gMonthDay)
- 0001-04-14 (xsd:gMonthDay)
- 0001-04-17 (xsd:gMonthDay)
- 0001-04-20 (xsd:gMonthDay)
- 0001-04-23 (xsd:gMonthDay)
- 0001-04-25 (xsd:gMonthDay)
- 0001-04-26 (xsd:gMonthDay)
- 0001-04-29 (xsd:gMonthDay)
- 0001-04-30 (xsd:gMonthDay)
- 0001-05-02 (xsd:gMonthDay)
- 0001-05-03 (xsd:gMonthDay)
- 0001-05-09 (xsd:gMonthDay)
- 0001-08-02 (xsd:gMonthDay)
- 0001-09-06 (xsd:gMonthDay)
- 0001-09-28 (xsd:gMonthDay)
- 0001-10-12 (xsd:gMonthDay)
- 0001-10-22 (xsd:gMonthDay)
- 0001-12-01 (xsd:gMonthDay)
- World War II: The MAS 552-class MAS boats were scuttled at Imperia. (en)
- thumb|Admiral Scheer World War II: The was sunk in a Royal Air Force air raid on Kiel, Schleswig-Holstein. (en)
- The landing craft mechanized were lost off the Arakan Coast, Burma sometime in April. (en)
- 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 by , , , and with the loss of all 52 crew. (en)
- World War II: The hospital ship was bombed and sunk at Kiel by American aircraft. (en)
- World War II: The heavy gun carrier/landing fire support ship was bombed and sunk at Fischhausen by Soviet Douglas A-20 Havoc aircraft. 29 crew were killed. (en)
- World War II: The Lauting-class mine transport was sunk at Kiel by Allied aircraft. (en)
- World War II: The Type 1915 minesweeper was scuttled sometime in April. (en)
- World War II: The minesweeper was bombed and sunk by Soviet aircraft off Hela. (en)
- World War II: The transport was bombed and sunk in Hong Kong Harbor by United States Far East Air Force Consolidated B-24 Liberator aircraft. Eight crewmen were killed. (en)
- World War II: The Type 1939/40 Schnellboot was sunk by , , and , also suffering damage in a collision with . The whole crew was rescued by (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Barents Sea by , and with the loss of all 51 crew. (en)
- World War II: The high-speed minesweeper, a former , was damaged in a Japanese kamikaze attack in the Pacific Ocean off Okinawa with the loss of 60 of her 208 crew. She was scuttled the next day. (en)
- World War II: The MAS boats were scuttled at La Spezia. (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean by and with the loss of all 57 crew. (en)
- World War II: The auxiliary submarine chaser was sunk by Soviet aircraft. (en)
- World War II: The badly damaged high-speed transport was scuttled in the Pacific Ocean near Kerama Retto. (en)
- World War II: The submarine chaser, a former , was scuttled at Venice. Raised, repaired and put in Italian service as Bombarda in 1951. (en)
- World War II: The MAS 501-class MAS boat was scuttled at Genoa, Italy. Raised, repaired and returned to Italian service post war, ceded to the Soviet Union in 1948 as War Reparation. (en)
- 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. (en)
- World War II: Convoy WA-201: The transport was torpedoed and sunk in the Pacific Ocean off Hokkaido by . 33 crewmen and two passengers were killed. (en)
- World War II: The submarine chaser, a former , was sunk off Genoa by United States Navy PT Boats. (en)
- The Type C2M minelaying Marinefährprahm was sunk on this date. (en)
- World War II: The Type MZ-A Marinefährprahm was sunk at La Spezia, Italy by an air raid. (en)
- World War II: Convoy TBC 123: The Liberty ship was torpedoed and sunk in the English Channel off Dungeness, Kent by U-5363 . (en)
- World War II: The MAS 552-class MAS boat was sunk off Imperia, Italy by and . (en)
- World War II: The MAS boats were scuttled at Imperia, Liguria. (en)
- World War II: Evacuation of East Prussia: The transport ship was torpedoed and damaged in the Baltic Sea north of Hela Danzig-West Prussia by . 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. (en)
- World War II: The struck a mine en route from Copenhagen, Denmark, to Swinemünde, Pomerania. Collided with a wreck while under tow and sank. (en)
- World War II: The submarine chaser was scuttled on this date. (en)
- World War II: The fishing trawler was sunk in the Kattegat by de Havilland Mosquito aircraft of 143, 235, 248 and 333 Squadrons, Royal Air Force. (en)
- The landing ship medium was wrecked and abandoned at Okinawa. Subsequently stripped for parts. (en)
- World War II: The hulk of the Standard 1TM tanker was raised and resunk at the entrance to Takao Harbour, Formosa. (en)
- World War II: Convoy PK 9: The cargo ship was torpedoed and damaged in the Barents Sea by with the loss of one crew member. Survivors abandoned ship but later reboarded her. Idefjord was taken in tow by and , arriving at Murmansk, Soviet Union the next day. Later repaired and returned to service. (en)
- World War II: The PiLB 43 type landing craft was sunk by Soviet bombers sometime in April. (en)
- 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. (en)
- The Type D Marinefährprahm was sunk on this date. Salvaged in 1946 and put in Italian service as MZ 831. (en)
- World War II: The Vorpostenboot was sunk in the Baltic Sea off Hela by Soviet aircraft. (en)
- World War II: The Type XXI submarine was bombed and sunk at Hamburg in a Royal Air Force air raid. (en)
- World War II: The Fairmile D motor torpedo boat was sunk by a mine off Zara, Italy. 16 crew members were killed. (en)
- The Sperrbrecher, a converted Type A Marinefährprahm, was sunk sometime in April. (en)
- World War II: The tanker was torpedoed and sunk in the Atlantic Ocean north east of Cape Henry, North Carolina by or with the loss of one of her 47 crew. Survivors were rescued by . (en)
- World War II: The Type B1 submarine was sunk in the Pacific Ocean off Okinawa by , four other destroyers and United States Navy carrier-based aircraft. (en)
- World War II: The gunboat was sunk by a mine off Sansego, Adriatic Sea, with the loss of 17 or 22 lives and 22 wounded. (en)
- 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. (en)
- World War II: The auxiliary naval vessel was torpedoed and sunk in the Java Sea by . (en)
- World War II: The Type R-218 minesweeper was sunk at Swinemünde, Pomerania by Soviet aircraft sometime in April. (en)
- World War II: The patrol boat was torpedoed and sunk in the Pacific Ocean south of Honshu by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Ireland by and with the loss of all 44 crew. (en)
- World War II: The cargo ship struck a mine and sank in the Vestfjord, Norway. (en)
- World War II: The incomplete RD-class minesweeper was scuttled at Costaguta shipyard, Genoa. (en)
- World War II: The auxiliary minesweeper was torpedoed and sunk in the East China Sea by . (en)
- World War II: The incomplete RD-class minesweepers were scuttled at Genoa. (en)
- World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean southwest of Ireland by a Vickers Wellington aircraft of 304 Squadron, Royal Air Force with the loss of all 41 crew. (en)
- World War II: The motor launch was torpedoed and sunk in the English Channel off Dover, Kent by a Kriegsmarine midget submarine. (en)
- World War II: The cargo ship was torpedoed and sunk by a Soviet Douglas A-20 Havoc aircraft off Öland, Sweden with the loss of 756 lives. (en)
- World War II: The cargo ship was torpedoed and sunk in the Baltic Sea by . (en)
- World War II: The torpedo boat was scuttled at La Spezia, Liguria. (en)
- World War II: The Type VIIC/41 submarine was sunk in the Skaggerak by a rocket attack by de Havilland Mosquito aircraft of 143 and 235 Squadrons, Royal Air Force with the loss of all 45 crew. (en)
- World War II: The cargo ship struck a mine and sank off Shanghai, China. (en)
- World War II: The MAS 552-class MAS boat was scuttled off Liguria, Italy. (en)
- The cargo ship was scuttled off Littlehampton, Sussex after service as a target ship. (en)
- World War II: The Type IXC/40 submarine was sunk in the Kattegat west of Gothenburg by a rocket attack by de Havilland Mosquito aircraft of 235 Squadron, Royal Air Force with the loss of 44 of her 56 crew. (en)
- World War II: The MS 11-class MS boats were scuttled at La Spezia sometime in April. (en)
- World War II: The cargo ship was bombed and sunk by aircraft in the Unterelbe. (en)
- World War II: The Victory ship was sunk in the Pacific Ocean off Okinawa, Japan by a Japanese kamikaze attack. Two gunners and a crewman were killed. Survivors swam to . (en)
- World War II: The Type IXC/40 submarine was sunk by torpedo in the Java Sea by with the loss of 54 of her 55 crew. (en)
- World War II: The M 1940-class minesweeper was sunk off Hel, Danzig-West Prussia by Soviet aircraft. (en)
- World War II: The cargo ship was bombed and sunk in the Kattegat by de Havilland Mosquito aircraft of the Royal Air Force. (en)
- World War II: The auxiliary minesweeper was torpedoed and sunk in the Pacific Ocean off the Japanese coast by . (en)
- World War II: The Type A Marinefahrprahm was sunk in the Baltic Sea by Soviet aircraft. (en)
- World War II: The was sunk in the Pacific Ocean off Okinawa, Japan by a Japanese kamikaze attack with the loss of 87 of her 314 crew. (en)
- World War II: The cargo ship sank at Bari due to damage sustained from the explosion of Charles Henderson . (en)
- World War II: The VAS 231-class submarine chaser was scuttled at Genoa. (en)
- World War II: The incomplete RD-class minesweeper was scuttled at Genoa. Salvaged post war and put in Italian service as DV 114. (en)
- World War II: The Type C escort ship was torpedoed and sunk in the Pacific Ocean off Japan by . (en)
- World War II: The was damaged in a Japanese kamikaze attack. She was consequently declared a constructive total loss. (en)
- The landing ship tank was wrecked and abandoned at Okinawa. Subsequently stripped for parts. (en)
- World War II: The Type R-41 minesweeper was sunk off Hel, Danzig-West Prussia by Soviet aircraft. (en)
- World War II: The cargo ship was torpedoed and sunk off Chesapeake Bay, Maryland, United States by with the loss of one of her 47 crew. Survivors were rescued by . (en)
- World War II: The MAS boats were scuttled at Genoa. (en)
- World War II: The cargo ship was torpedoed and sunk in the East China Sea by . (en)
- World War II: The tanker was torpedoed and sunk in the Gulf of Siam by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean west of Ireland by , and with the loss of all 42 crew. (en)
- World War II: The cargo ship capsized and sank in the Atlantic Ocean (en)
- The ran aground and sank in the Yucatan Channel north west of Arroyos de Mantua, Cuba. (en)
- World War II: The torpedo boat, the former , was scuttled at Genoa. (en)
- World War II: The cargo ship was bombed and sunk by Consolidated B-24 Liberator, Martin B-26 Marauder and Lockheed P-38 Lightning aircraft of the United States Fifth Air Force . Sixteen gunners and thirteen crew members were lost. (en)
- The Este-class naval trawler/trials ship was sunk on this date. (en)
- World War II: The minelayer was wrecked in a Royal Air Force air raid on Kiel, Schleswig-Holstein. (en)
- The Project 1125-class armored motor gunboat was sunk on this date. (en)
- World War II: The cargo ship was bombed and sunk by aircraft at Hamburg, Germany. Raised 1945 and broken up in Wales in 1947. (en)
- World War II: Convoy TBC 135: The cargo ship was torpedoed and damaged in the Bristol Channel off St. Ives, Cornwall by with the loss of three of her 48 crew. She was beached in St Ives Bay. Later repaired and returned to service. (en)
- World War II: The minesweeper was sunk at Kiel in a British air raid. (en)
- World War II: The escort ship, a former torpedo boat, was scuttled at Oneglia, Liguria, Italy as a blockship. (en)
- World War II: The cargo ship was bombed and sunk by Martin PBM Mariner aircraft of the United States Navy . Fifty-six passengers, five gunners and nineteen crew members were lost. (en)
- The landing craft personnel (ramp) foundered in a storm in the Mediterranean Sea. (en)
- World War II: The incomplete was scuttled at Stettin, West Pomerania. She was raised and salvaged by the Soviet Union in 1947. (en)
- World War II: The was torpedoed and sunk in the Atlantic Ocean off Chebucto Head, Nova Scotia , by with the loss of 44 of her 71 crew. She was the last Canadian warship sunk during the war. (en)
- 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. (en)
- World War II: The was mined and sunk in the Shimonoseki Strait . Twenty-seven crewmen were killed. (en)
- World War II: Soviet aircraft bombed and sank the cargo ship in the port of Pillau, East Prussia. (en)
- World War II: The Type 1939/40 Schnellboote sank after a collision in the North Sea with S 703 whilst engaging Royal Navy motor torpedo boats. Six crewmen were killed and the survivors were captured. (en)
- World War II: The incomplete minesweepers were scuttled at Genoa. (en)
- World War II: The Type IXC/40 submarine was depth charged and sunk in the Bay of Biscay west of Saint-Nazaire, Loire-Inférieure, France by and with the loss of all 51 crew. (en)
- World War II: The CHa-1-class auxiliary submarine chaser was sunk off Matsure Light, Japan by a mine sometime in April. (en)
- World War II: The Type R-41 minesweeper was sunk in The Great Belt by mines. (en)
- World War II: The incomplete Ape-class submarine chaser, a former , was scuttled at Ansaldo Shipyard, Genoa. (en)
- World War II: The was sunk in the Andaman Sea east of Car Nicobar by Consolidated B-24 Liberator aircraft of 203 Squadron, Royal Air Force. (en)
- World War II: The was damaged in a Japanese kamikaze attack with the loss of nine of her crew. She was consequently abandoned due to an onboard fire and fears that her magazines would explode. A skeleton crew later reboarded her and she was taken in to Pearl Harbor, Hawaii. Subsequently repaired and returned to service. (en)
- World War II: Convoy UC 63B: The cargo ship was torpedoed and sunk in the English Channel east of Dungeness by U-5070 . (en)
- World War II: The tanker was bombed and set on fire and sunk by North American B-25 Mitchell aircraft of the 498th and 500th Bomb Squadrons at Mako, Pescadore Islands . (en)
- World War II: Japanese kamikazes sank the landing craft support off Okinawa. Of the 73 men aboard, one was killed, three missing, 29 seriously wounded and 40 were rescued lightly wounded or unhurt. (en)
- End of World War II: The decommissioned Type IXB submarine was scuttled at Stettin, Pomerania. (en)
- World War II: The submarine was destroyed in a British air raid on Hamburg. (en)
- World War II: The was scuttled at Genoa. Raised in 1946 and returned to France. She was not repaired and scrapped in 1958. (en)
- The landing ship tank ran aground and sank off Plymouth, Devon, United Kingdom . (en)
- World War II: The boat was sunk in the Yellow Sea by . (en)
- World War II: The struck a mine and sank off Porto Corsini, Ravenna, Italy. (en)
- World War II: The Type VIIC submarine was torpedoed and sunk in the North Sea north west of Bergen, Norway by with the loss of all 48 crew. (en)
- World War II: Convoy HOMO-03: The Type D escort ship was sunk in Fotou Bay south west of Amoy by North American B-25 Mitchell aircraft of the 345th Bomb Group, United States Army Air Force. (en)
- World War II: The Type 1939/40 Schnellboot was sunk by , , and , also suffering damage by ramming . Five men were killed and the survivors were captured. (en)
- The Type D Marinefährprahm was sunk by Allied fighter-bombers near Fiume, Italy. (en)
- World War II: The auxiliary guardboat was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: The was sunk in the Pacific Ocean south southwest of Okino-Daito Jima by . (en)
- World War II: Convoy VWP-16: The troopship was torpedoed and sunk in the English Channel south east of the Isle of Wight by with the loss of one of the 265 people on board. Survivors were rescued by . (en)
- World War II: The was torpedoed and sunk off Kii Suido south south east of Mikizaki by . (en)
- World War II: The MAS 521-class MAS boat was scuttled at Imperia or Genoa, Italy. (en)
- World War II: The Type 1939/40 Schnellboot was sunk at Hoofden by a mine. 20 crewmen were killed. Only nine men survived. (en)
- World War II: Convoy MOSHI-02: The was torpedoed causing her forward magazine to explode, she jackknifed, broke in two and sank in Hiyo Inlet, Saishu Island , by . Sank in shallow water and only partially submerged. One hundred and thirty-four crewmen were killed including her captain. 87 survivors were rescued by islanders. (en)
- World War II: The Type 1939/40 Schnellboote sank after a collision in the North Sea with S 202 whilst engaging Royal Navy motor torpedo boats. Seven crewmen were killed and the survivors were captured. (en)
- World War II: The submarine chaser was bombed and set afire in a Soviet air raid on Hela. She was towed out of the port and scuttled by . (en)
- World War II: Convoy TAMO-51: The cargo ship was torpedoed and sunk in the Yellow Sea by . Thirty-nine crew and nine gunners were killed. (en)
- The was lost sometime in April. (en)
- The MZ-A landing craft was sunk on this date. (en)
- The MZ-B landing craft was sunk on this date. (en)
- The Type A Marinefährprahm was sunk on this date. (en)
- The Type D Marinefahrprahm was sunk on this date. (en)
- The Type D Marinefährprahm was sunk on this date. (en)
- The auxiliary guard boat was lost on this date. (en)
- The auxiliary minesweeper was lost on this date. (en)
- The guard ship was lost on this date. (en)
- The landing craft assault was sunk off Holland. (en)
- The Type AM minelaying Marinefährprahm was sunk sometime in April. (en)
- World War II: The Type 1940 minesweeper was bombed and sunk sometime in April in an air raid. Raised and repaired post war. (en)
- 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. (en)
- World War II: The Standard Type 2A tanker, also called Taishu Maru, was sunk by torpedo in the Pacific Ocean east of Kamaishi, Honshu by . Her captain and 29 crewmen were killed. (en)
- World War II: Convoy PK 9: The cargo ship was torpedoed and sunk in the Barents Sea by with the loss of five of her 42 crew. Survivors were rescued by and . (en)
- World War II: The was scuttled at Genoa, Italy. (en)
- World War II: The was scuttled at Genoa. (en)
- World War II: The was sunk by Soviet aircraft. (en)
- World War II: The submarine was scuttled at Genoa. (en)
- World War II: The RD-class minesweeper was scuttled at Genoa. (en)
- World War II: The cargo ship was torpedoed and sunk in the Gulf of Alaska by . (en)
- World War II: The was damaged/sunk in the North Sea by a Kriegsmarine Seehund midget submarine. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Barents Sea by with the loss of 37 of her 51 crew. (en)
- World War II: The Type R-41 minesweeper was sunk at Kiel by American aircraft. (en)
- World War II: Convoy HX 348: The tanker was torpedoed and sunk in the Atlantic Ocean by with the loss of 43 of her 47 crew. Survivors were rescued by . (en)
- World War II: The Type 37 torpedo boat was bombed and sunk by Allied aircraft at Fredrikshavn, Denmark. (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea north of St Abb's Head, Berwickshire by with the loss of eight of her 24 crew. Survivors were rescued by and the St Abb's lifeboat Royal National Lifeboat Institution. (en)
- World War II: The incomplete RD-class minesweeper was scuttled at Picchiotti shipyard, Limite Sal Arno in late April. (en)
- World War II: The Type IXC/40 submarine was sunk in the Kattegat off Gothenburg, Sweden by de Havilland Mosquito aircraft of 143 Squadron and 235 Squadron, Royal Air Force with the loss of all 55 crew. (en)
- World War II: The Type VIIC/41 submarine was damaged in the Irish Sea south of the Isle of Man (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Japan by . 41 crewmen were killed. (en)
- World War II: The CHa-1-class auxiliary submarine chaser was sunk off Matsure Light by mines. (en)
- World War II: The cargo ship was bombed and wrecked by aircraft at Hamburg, Germany. Wreck scrapped in January 1950. (en)
- World War II: The cargo ship was bombed by Soviet aircraft off Hel and was beached. 500 killed. (en)
- World War II: The VAS 201-class submarine chasers were scuttled at Alto Tirino, Abruzzo. (en)
- The decommissioned S-class submarine was sunk as a target 14 miles west south west of Key West, Florida in 260 feet of water. (en)
- World War II: Convoy CU 65: The T2 tanker collided with in the Atlantic Ocean , caught fire and was abandoned. (en)
- World War II: The cargo ship was sunk by a mine in the Yangtze near where it empties into the East China Sea on "Middle Ground" off Shanghai, China . Five troops and eighteen crewmen were killed. (en)
- World War II: The minesweeper was heavily damaged by a mine off Okinawa . Five of her 32 crew were killed. She was beached and abandoned as a total loss. (en)
- The light gun carrier/landing fire support ship was sunk on this date (en)
- The Type C2 Marinefährprahm was sunk on this date. (en)
- World War II: The MS 51-class MS boat was scuttled at La Spezia sometime in April. (en)
- World War II: The Kaichū type submarine was depth charged and sunk in the Pacific Ocean off Okinawa by . (en)
- The Project 1124/No 41-class armored motor gunboat was lost on this date. (en)
- World War II: The Type R-151 minesweepers were scuttled at Genoa. (en)
- World War II: The training ship was sunk by Allied bombers at Kiel. (en)
- World War II: The cargo ship was bombed and sunk in the Skagerrak by British aircraft. (en)
- World War II: The StuBo 39 type landing craft was sunk in the Baltic Sea, either by mines or shelled by Soviet motor torpedo boats. (en)
- World War II: De Havilland Mosquito aircraft of 143, 235, 248 and 333 Squadrons, Royal Air Force bombed and sank the coaster at Porsgrunn, Norway. Raised post-war, repaired and returned to service. (en)
- World War II: Convoy MOSHI-02: The Juzan Maru-class auxiliary transport was torpedoed and sunk in Hiyo Inlet, Saishu Island , by . Thirty-three crewmen were killed. 166 survivors rescued. (en)
- The Type VIIC submarine was lost in the North Sea in a diving accident with the loss of four of her 50 crew. (en)
- World War II: The MS 11-class MS boat was scuttled at Genoa. (en)
- World War II: The cargo ship was bombed by aircraft at Hamburg, Germany. Beached at Juelsand in May 1945. Broken up in situ in 1946. (en)
- World War II: The KSK-2-class naval drifter/Vorpostenboot was scuttled. (en)
- World War II: The Type D Marinefahrprahm was sunk incomplete at Monfalcone, Italy. (en)
- World War II: The Type R-151 minesweeper was scuttled at Genoa. (en)
- World War II: The sprang 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. (en)
- World War II: The cargo liner was scuttled at Trieste. Wreck scrapped in 1946. (en)
- World War II: The Type R-218 minesweeper was sunk at Kiel by American aircraft. (en)
- World War II: The steamer was sunk in the Sava River between Šabac and Sremska Mitrovica by a magnetic mine. Four killed. (en)
- World War II: Convoy TAM 118: The cargo ship was torpedoed and sunk in the English Channel off Dover, Kent by . (en)
- World War II: The Type VIIC submarine was bombed and sunk at Kiel in an American air raid with the loss of two crew. (en)
- World War II: The was severely damaged by a mine in the North Sea. Declared a constructive total loss. (en)
- World War II: The incomplete RD-class minesweeper was scuttled at Castaguta shipyard, Genoa in late April. (en)
- World War II: Operation Ten-Go: The was bombed and damaged in the Pacific Ocean south west of Nagasaki by United States Navy aircraft. Scuttled by with the loss of seventeen crewmen killed and 47 wounded. (en)
- World War II: The was sunk in the East China Sea southwest of Amami Ōshima by United States Navy aircraft from Task Force 58. There were 49 dead and 80 wounded. (en)
- World War II: The oiler was torpedoed and sunk in the Sunda Strait by . 9 passengers died. 29 passengers and all 9 crew members are rescued. (en)
- World War II: The artillery training ship was sunk at Fischhausen, Eastern Prussia by Soviet aircraft. (en)
- World War II: The cargo ship was scuttled at Bremen. She was raised later in the year, repaired and entered Finnish service in 1947 as Margareta. (en)
- World War II: The submarine chaser was bombed and sunk off Hela by Soviet aircraft. (en)
- World War II: The Type VIIC/41 submarine was bombed and sunk in the Bay of Biscay west of Brest, Finistère, France by a United States Navy Consolidated PBY Catalina aircraft of Squadron VP-63 with the loss of 37 crew. (en)
- World War II: The Type VIIC submarine was bombed and sunk at Kiel in an American air raid with the loss of a crew member. (en)
- World War II: Convoy MOSHI-02: The Type C escort ship was torpedoed in the stern by a dud that started a fire, later she capsized and sank in Hiyo Inlet, Saishu Island , by . Sank in shallow water and only partially submerged. Thirty-nine crewmen were killed. 166 survivors rescued by islanders. (en)
- World War II: The was sunk in the Adriatic Sea by and . (en)
- World War II: Convoy HOMO-03: The Type C escort ship was sunk in Fotou Bay, China south west of Amoy by North American B-25 Mitchell aircraft of the 345th Bomb Group, United States Army Air Force. (en)
- World War II: The Mk 2 landing ship tank was damaged at Kerama Retto, Japan in a kamikaze attack. She sank the next day. (en)
- World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean north of the Azores, Portugal by and with the loss of all 56 crew. (en)
- World War II: The MAS 423-class MAS boat was scuttled at Alta Tirreno. (en)
- World War II: The tanker was sunk in an American air raid on Kiel. (en)
- World War II: The Type VIIC submarine was shelled and sunk at Pillau, East Prussia by Red Army artillery. (en)
- thumb|Nikko MaruWorld War II: The troop ship was torpedoed and sunk in the Yellow Sea north-east of Tsingtao, China , by . A total of 563 passengers, fourteen gunners, sixteen guard force soldiers, two signallers, and 73 crewmen were killed. (en)
- World War II: The minesweeper was sunk in Fedefjord by aircraft of Coastal Command, Royal Air Force. (en)
- World War II: The coaster was torpedoed and sunk in the Atlantic Ocean off Sligo, Ireland by with the loss of sixteen of her seventeen crew. (en)
- World War II: The was sunk in the Pacific Ocean off the Ryukyu Islands, Japan by a kamikaze aircraft attack. (en)
- World War II: The coaster was torpedoed and sunk in the Java Sea by . (en)
- World War II: The W-19-class minesweeper was torpedoed and sunk in the East China Sea north of Keelung, Formosa by . There were 75 survivors, one was rescued by USS Cod as a prisoner of war. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean south of Honshu by . (en)
- World War II: The submarine chasers, former s, were scuttled at Genoa. (en)
- World War II: Convoy HX 348: The Liberty ship was torpedoed and sunk in the Atlantic Ocean by with the loss of six of her 53 crew. Survivors were rescued by . (en)
- World War II: The Fairmile D motor torpedo boat was sunk by a mine in the Adriatic Sea. (en)
- 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 . (en)
- World War II: The fishing vessel was sunk south south east of Block Island when a depth charge caught in her net exploded. Three crewmen were killed. The only survivor was rescued by Mandalay . (en)
- World War II: The Type XXI submarine was sunk at Kiel in a British air raid. The wreck was scrapped post-war. (en)
- World War II: The MAS 526-class MAS boat was scuttled at Monflacone, Italy. (en)
- World War II: The Type XXI submarine was bombed and sunk at Kiel in an American air raid with the loss of a crew member. The wreck was scrapped post-war. (en)
- World War II: A Japanese kamikaze attack using an Aichi D3A or Yokosuka MXY7 Ohka aircraft sank the in the Pacific Ocean north west of Okinawa . and , rescued the survivors. (en)
- World War II: The Ape-class submarine chaser, a former , was scuttle at Monfalcone. (en)
- World War II: The cargo ship was scuttled at Genoa, Italy. She was later raised and salvaged. (en)
- World War II: The incomplete cargo ship was bombed and sunk at Pillau, East Prussia by Soviet aircraft. (en)
- World War II: The torpedo boat, a former , was scuttled at Genoa. (en)
- World War II: The repair ship, a converted Kriemhild-class guard ship, was sunk on the Danube River by aircraft. Raised, repaired and put in Soviet service as Angara. (en)
- World War II: The Type R-2 minesweeper was sunk in the Adriatic Sea by Royal Navy motor torpedo boats. (en)
- World War II: The Type VIIC submarine was bombed and destroyed at Hamburg in a Royal Air Force air raid. (en)
- 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. (en)
- World War II: The was torpedoed and damaged in the Java Sea north west of Bima, Dutch East Indies by . She was then torpedoed and sunk by at . One hundred and ninety crewmen were killed. Four hundred and thirty-seven crewmen and her captain were rescued by , and thirteen by . (en)
- World War II: The torpedo boat was scuttled at Genoa. (en)
- World War II: Convoy TAC 90: The tanker was sunk in the Scheldt by a Kriegsmarine Seehund midget submarine. (en)
- World War II: The cable ship was torpedoed and sunk in the North Sea off Orfordness, Suffolk by a Kriegsmarine Seehund midget submarine. (en)
- World War II: The Liberty ship struck a mine and was damaged in the North Sea off Ramsgate, Kent, United Kingdom by . She was towed to Falmouth, Cornwall, where she was declared a total loss. Scrapped in 1948. (en)
- World War II: The cargo ship was sunk at Kiel during and Allied air raid. The wreck was raised in 1948 and scrapped. (en)
- World War II: The Type R-41 minesweeper was sunk in an American air raid on Kiel. (en)
- World War II: The fishing vessel was shelled and sunk in the Indian Ocean by . (en)
- World War II: The was torpedoed and damaged off Komodo Island and beached , torpedoed again and sunk by . (en)
- World War II: The cargo ship was bombed and sunk off Gothenburg, Sweden by British aircraft. (en)
- World War II: The was sunk by Soviet aircraft off Hela, Danzig-West Prussia. (en)
- World War II: The cargo ship was sunk in the Baltic Sea by Soviet aircraft. (en)
- World War II: The was torpedoed and sunk off Tomei Harbor, Fukue Shima, Goto Archipelago, by . (en)
- World War II: The refugee ship was torpedoed and sunk off the Hel Peninsula, Danzig-West Prussia by with the loss of about 960 lives. There were eight survivors. (en)
- World War II: The coaster either struck a mine, or was torpedoed and sunk in the Skaggerak off Egersund, Norway with the loss of seven crew. (en)
- World War II: The Sperrbrecher struck a mine and sank in the North Sea off Cuxhaven, Schleswig-Holstein . (en)
- World War II: The Vorpostenboot struck a mine and sank in the Baltic Sea north-east of Kiel, Schleswig-Holstein . (en)
- World War II: The minesweepers, former s, were scuttled at Genoa. (en)
- World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean off Land's End, Cornwall, United Kingdom by with the loss of 29 of her 46 crew. (en)
- The D-3-class motor torpedo boat was lost on this date. (en)
- World War II: The trawler struck a mine and sank in the Firth of Clyde with the loss of all ten crew. (en)
- 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 with the loss of 446 crew members. (en)
- World War II: De Havilland Mosquito aircraft of 143, 235, 248 and 333 Squadrons, Royal Air Force bombed and sank the cargo ship at Porsgrunn. (en)
- World War II: The submarine chaser, a former corvette, was scuttled at Genoa. (en)
- World War II: The auxiliary netlayer was sunk in the Andaman Sea east of Car Nicobar by Consolidated B-24 Liberator aircraft of 203 Squadron, Royal Air Force. (en)
- World War II: The Type R-218 minesweeper sank off Bornholm, Denmark after being damaged during a Soviet air attack. (en)
- World War II: The cargo ship was sunk by Soviet aircraft. (en)
- World War II: The minelayer was scuttled at La Spezia, Liguria, Italy. (en)
- World War II: The cargo ship was bombed and sunk by Soviet Douglas A-20 Havoc aircraft off the Hel Peninsula, Poland. 970 killed. (en)
- World War II: The Type VIIC/41 submarine was depth charged and sunk in the Atlantic Ocean north west of Ireland by a Consolidated B-24 Liberator aircraft of 120 Squadron, Royal Air Force with the loss of all hands . (en)
- The Type DM minelaying Marinefährprahm was sunk on this date. (en)
- World War II: The tanker struck a mine and sank in the Gulf of Siam off Linga, Malaya. (en)
- World War II: The Type 1916 minesweeper was bombed and sunk by British aircraft at Kiel. (en)
- World War II: The Miike Maru-class hospital ship was torpedoed and sunk by the submarine while marked with illuminated white cross and after having been guaranteed safe passage by the Allies. There was only one survivor among the 2,005 people on board, rescued by Queenfish. The wreck was located at in the 1970s–1980s. Salvage work was done by China Salvage Company, with some remains and artifacts returned to Japan. (en)
- World War II: The radar picket destroyer/torpedo boat was scuttled at Genoa. (en)
- World War II: The MAS 424-class MAS boat was scuttled at Alta Tirreno. (en)
- World War II: The cargo ship was bombed and sunk in the Baltic Sea off Hela, Danzig-West Prussia by Soviet aircraft. (en)
- World War II: The was mined in Buckner Bay, Okinawa and sank with a loss of 14 of her crew, some of them aboard the YMS-103 that was mined while rescuing them. 14 of the 50 survivors were wounded. (en)
- World War II: The MAS 526-class MAS boats were scuttled at Imperia, Italy. (en)
- World War II: The was bombed, strafed and sunk in the Kattegat, south-east of Anholt, Denmark by de Havilland Mosquito aircraft of 143, 235, 248 and 333 Squadrons, Royal Air Force. (en)
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