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- World War II: The cargo ship was torpedoed and damaged in the Mediterranean Sea by . She was towed in to Naples, Italy and laid up. (en)
- World War II: The tanker was sunk during an attack on Palermo by Consolidated B-24 Liberator aircraft of 301st Bombardment Group, United States Army Air Force, either by bombs or by the explosion of the ammunition ship . (en)
- World War II: Convoy SL 126: The Design 1037 ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 47 of the 57 people aboard. Survivors were rescued by . (en)
- World War II: The Ocean ship was sunk at Tripoli by Junkers Ju 88 aircraft of Kampfgeschwader 30, Kampfgeschwader 54 and Kampfgeschwader 77, Luftwaffe. This was the Luftwaffe's first mass attack utilizing Italian design Motobomba circling torpedoes. Five of her crew were killed. (en)
- World War II: The British WWI C-class standard cargo ship was torpedoed and sunk in the Pacific Ocean by . Survivors were rescued by . (en)
- World War II: The motor sailboat/transport was captured by a Partizan boat and sunk. She was later raised and converted into a hospital boat. (en)
- World War II: The cargo ship was bombed or torpedoed and sunk in the Mediterranean Sea off Cape Bon, Tunisia by Allied aircraft. There were 21 or 23 dead and 92 or 94 survivors. (en)
- World War II: The auxiliary minelayer was sunk by a mine off Myskhako. At least seven of her crew were killed. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy, No. 2 Division : The Kyokusei Maru-class auxiliary transport ship was bombed and sunk off Lae, New Guinea by Boeing B-17 Flying Fortress aircraft of the United States Army Air Forces. A crewman and 485 troops were killed. Eight hundred surviving troops were rescued by and , with the troops taken to Lae. (en)
- World War II: The Kenyo Maru-class auxiliary transport was torpedoed and sunk north north west of Saipan, Mariana Islands by . One hundred and thirty engineering passengers, 30 comfort women, and four of her crew were killed. (en)
- World War II: Convoy DN 21: The cargo ship was torpedoed and sunk in the Indian Ocean south of Port St. Johns, Union of South Africa by with the loss of 38 of the 126 people aboard. Survivors were rescued by R-8 . (en)
- World War II: The was rammed and sunk off Freetown, Sierra Leone, by after being mistaken for a German submarine. There were no casualties. (en)
- World War II: The tanker was torpedoed and sunk off Cape San Vito by with the loss of fourteen of her 32 crew. (en)
- World War II: The Type A Marinefahrprahm was sunk by a mine in the Black Sea. (en)
- World War II: The harbour defence motor launch was lost as cargo when , bombed by a Focke-Wulf Fw 200 aircraft of the Luftwaffe the day before, sank in the Atlantic Ocean off the coast of Portugal. (en)
- World War II: The landing craft was bombed and sunk in drydock at Palermo in an Allied air raid. (en)
- The cargo ship ran aground and was wrecked in the Inland Sea of Japan off Itozaki . (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of eight of the 118 people aboard. Survivors were rescued by . (en)
- World War II: Convoy BT 6: The cargo ship was torpedoed and sunk in the Atlantic Ocean north of Paramaribo, Surinam by with the loss of 28 of her 60 crew. Survivors were rescued by . (en)
- World War II: Convoy SC 121: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 30 crew. (en)
- World War II: The radio ship was torpedoed and sunk in the Mediterranean Sea off Derna by with the loss of nine of her 81 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea off Terschelling, Friesland, Netherlands by Royal Navy motor torpedo boats. Three men and one woman were killed from a crew of eighteen men and two women. (en)
- World War II: The cargo ship was bombed and sunk in the Mediterranean Sea by British aircraft. (en)
- World War II: The cargo ship was bombed and sunk in the Mediterranean Sea southwest of Marettimo. All, or almost all, of the approximately 200 men aboard were rescued. (en)
- World War II: The was bombed and sunk in drydock at Palermo, Sicily in an Allied air raid. Three of her crew were killed. The wreck was raised in 1944 for scrapping but sank whilst being towed to Taranto, Italy. (en)
- The T2 tanker broke in two off New York. She was subsequently repaired and returned to service. (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell by with the loss of 24 of her 49 crew. Survivors were rescued by . (en)
- The landing craft support (mortar) was lost in the Mayu River, Burma sometime in March. (en)
- World War II: The cargo ship struck the wreck of and was beached on the Herd Sands, off the mouth of the River Tyne. She was a total loss. (en)
- World War II: Convoy DN 21: The Design 1022 ship was torpedoed and sunk in the Indian Ocean by with the loss of eighteen of her 54 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 32 lives. One survivor was rescued by the submarine and another one week later by an Allied ship. (en)
- World War II: Operation Brandy: The Fairmile D motor torpedo boat ran aground at Florø, Norway and had to be abandoned, her crew going aboard . She was later salvaged by the Germans and put into service as S 631. (en)
- World War II: Convoy HX 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by with the loss of 34 of the 84 people aboard. Survivors were rescued by and . (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea by . There were no casualties. (en)
- The unpowered open lighter ran aground and sank off Imperial Beach, California. (en)
- World War II: Convoy XK 2: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . Her 47 crew were rescued by . Ger-Y-Bryn was on a voyage from Lagos, Nigeria to Hull, Yorkshire. (en)
- World War II: The struck a mine and sank north of Cape Bon, Tunisia. Five hundred and twenty men died . There were 80 survivors . (en)
- World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by . (en)
- World War II: Convoy RA 53: The Design 1022 ship was torpedoed and damaged in the Norwegian Sea by with the loss of nine of her 62 crew. Survivors were rescued by and . Executive was later scuttled by a Royal Navy destroyer. (en)
- World War II: Convoy XK 2: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of Lisbon, Portugal by with the loss of 42 of her 45 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea by a Vickers Wellington aircraft of 221 Squadron, Royal Air Force off Capri. There were six dead and 119 survivors. Also reported as being torpedoed and sunk by British aircraft at Tripoli, Libya, with the wreck being refloated and scrapped. (en)
- The unpowered covered lighter was lost off the Atlantic coast of the United States. (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea off Terschelling, Friesland, Netherlands by and . All eighteen crew were rescued by a German minesweeper. (en)
- World War II: Convoy SC 121: The cargo ship was torpedoed and sunk in the Atlantic Ocean south of Reykjavík, Iceland by with the loss of 45 of her 49 crew. Survivors were rescued by and . (en)
- World War II: The passenger ship was torpedoed and sunk in the Atlantic Ocean off the coast of Brazil by with the loss of 125 of her 242 passengers and crew. (en)
- The landing craft personnel was lost "in transit". (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and damaged in the Atlantic Ocean by with the loss of fifteen of her 64 crew. She later sank at . (en)
- World War II: Convoy KMF 11: The troopship was torpedoed and sunk in the Mediterranean Sea west north west of Algiers, Algeria by a Heinkel He 111 aircraft of II Staffeln, Kampfgeschwader 26, Luftwaffe with the loss of one of the 2,989 people on board. Survivors were rescued by , , and . (en)
- World War II: The Liberty ship was torpedoed, shelled and sunk in the Mozambique Channel north east of Durban, Union of South Africa by with the loss of one of her 67 crew. (en)
- World War II: The Type VIIC submarine was rammed and sunk in the Atlantic Ocean by with the loss of all 43 crew. (en)
- World War II: The icebreaker struck a mine and sank in the North Sea off Warnemünde. (en)
- World War II: Convoy HX 227: The Liberty ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 75 people aboard . (en)
- World War II: The cargo ship was torpedoed and damaged at Algiers, Algeria by Junkers Ju 88 aircraft of II Staffeln, Kampfgeschwader 30, Luftwaffe. Her back broken, she was declared a constructive total loss, towed out to sea and scuttled. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Boeing B-17 Flying Fortress aircraft of 206 Squadron, Royal Air Force with the loss of all 47 crew. (en)
- World War II: The fishing boat was sunk by a mine in the Kattegat. Her crew were rescued by other fishing boats. (en)
- World War II: Convoy DN 21: The cargo ship was torpedoed and sunk in the Indian Ocean by with the loss of five of her 45 crew. Survivors were rescued by R-8 . Marietta E. was on a voyage from Durban, Union of South Africa to Aden, Aden Protectorate. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 21 crew. There were seven survivors. (en)
- World War II: The auxiliary submarine chaser was torpedoed and sunk in the Bay of Palermo by . Three of her crew were killed. (en)
- World War II: The cargo ship was shelled and sunk in the Laotiehshan Channel by . (en)
- The barge was washed ashore at Lena Point, Territory of Alaska after her towing vessel, the motor vessel Highway , was lost with all hands in the Lynn Canal. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south of Iceland (en)
- World War II: The cargo ship was bombed and sunk at Rotterdam, South Holland, Netherlands, by Royal Air Force aircraft. She was later raised, repaired and returned to service. (en)
- World War II: The was sunk in an air raid on Catania, Sicily by United States Army Air Force aircraft. (en)
- World War II: Convoy BT 6: The Liberty ship was torpedoed and damaged in the Atlantic Ocean north of Cayenne by with the loss of six of her 58 crew. Survivors abandoned ship and were rescued by and . Thomas Ruffin was towed to Port of Spain, Trinidad by . She was later towed to Mobile, Alabama, where she was declared a constructive total loss. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy: The was bombed and sunk in the Bismarck Sea near Finschhafen by Allied aircraft. Seventy-two of her crew were killed. One hundred and seventy-six survivors were rescued by . (en)
- World War II: Convoy ON 48: The cargo ship collided with and sank in the Atlantic Ocean . Her crew survived. (en)
- World War II: The tanker was torpedoed and sunk in the Makassar Strait between Tarakan and Samarinda, Borneo by . (en)
- World War II: The cargo ship was torpedoed and sunk in the East China Sea by . (en)
- World War II: The Tokiwasan Maru-class auxiliary water tanker was torpedoed and sunk in the Pacific Ocean south of Ponape, Caroline Islands by . Five of her crew were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of four of the 47 people aboard. (en)
- World War II: The tanker was torpedoed and damaged in the Atlantic Ocean by with the loss of 24 of her 39 crew. She sank the next day. (en)
- World War II: Convoy HX 229: The Liberty ship was torpedoed and damaged in the Atlantic Ocean by . Her 72 crew were rescued by , which scuttled the ship. (en)
- World War II: The cargo ship was torpedoed, shelled and sunk in the Indian Ocean by with the loss of twelve of her 46 crew. (en)
- World War II: The landing craft tank was being carried as deck cargo aboard and was lost when that ship was torpedoed and sunk by . (en)
- World War II: The Fort ship was torpedoed and sunk in the Indian Ocean north west of Ceylon by . Her crew survived the sinking, but all but one gunner were machine gunned and killed in their lifeboats. The gunner was rescued by an Arab dhow. (en)
- World War II: The tug was bombed and sunk at Palermo in an Allied air raid. (en)
- World War II: The cargo ship was torpedoed and sunk off Kongsfjord by . Two of her crew were killed. (en)
- World War II: Convoy GAT 49: The cargo ship was torpedoed and sunk in the Caribbean Sea by with the loss of two of her 37 crew. Survivors were rescued by one of the escort vessels. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of two of her 68 crew. One of the survivors was taken as a prisoner or war. (en)
- The fishing vessel was wrecked in Herring Bay near Petersburg, Territory of Alaska. (en)
- World War II: Convoy UGS 6: The Design 1013 ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of the Azores, Portugal by with the loss of a gunner and a crew member. Survivors were rescued by . (en)
- World War II: The Siebel ferry was bombed and sunk at Palermo in an Allied air raid. (en)
- World War II: The cargo ship was bombed and sunk in the Mediterranean Sea east of Bizerta, Tunisia by Allied aircraft. There were 41 dead and 102 survivors. (en)
- World War II: Battle of Blackett Strait: The was shelled and sunk in the Pacific Ocean off Vila, Solomon Islands by ships of Task Force 68, United States Navy, with the loss of 128 of her 181 crew. (en)
- World War II: Convoy No. 2303B: The cargo ship was torpedoed in the Pacific Ocean southwest of "Miyako" by . Although the torpedo did not explode, it holed her hull and she consequently sank. Her passengers and crew were rescued by . (en)
- World War II: Convoy SC 122: The Fort ship, on her maiden voyage, straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean south east of Cape Farewell, Greenland by . She was later torpedoed and sunk by . Her 50 crew were rescued by . (en)
- World War II: Convoy KG 123: The tanker was torpedoed and sunk in the Caribbean Sea off Cape Maysi, Cuba by (en)
- World War II: Convoy KG 123: The Liberty ship was torpedoed and sunk in the Caribbean Sea off Guantánamo Bay, Cuba by with the loss of all 69 crew. (en)
- World War II: The submarine chaser was sunk in a collision off North Carolina when two convoys respectively northbound and southbound met in bad visibility. She was rammed by and then by . SC-1024 capsized and sank with the loss of all hands. (en)
- World War II: Convoy SL 126: The cargo ship was torpedoed and damaged in the Atlantic Ocean by . All 103 people aboard were rescued by , which scuttled the ship. (en)
- World War II: Convoy CN 13: The cargo ship was torpedoed and sunk in the Indian Ocean by with the loss of ten of her 47 crew. (en)
- World War II: The cargo ship was shelled and sunk in the English Channel by shore-based artillery stationed at Dover, Kent, United Kingdom with the loss of 22 of her crew. (en)
- World War II: Convoy KMS 10: The Fort ship was torpedoed and sunk in the Atlantic Ocean by . All 65 people aboard were rescued by and . (en)
- World War II: Convoy MKS 10: The cargo ship was torpedoed and damaged in the Mediterranean Sea north west of Oran, Algeria by with the loss of two of her 92 crew. She was taken in tow by and beached south of Cape Figalo, where she was declared a total loss. (en)
- World War II: The Type VIIC submarine was depth charged, rammed and sunk in the Atlantic Ocean by and with the loss of 41 of her 45 crew. (en)
- World War II: The Type C2-SU-R ship was torpedoed and sunk in the Atlantic Ocean off the coast of Brazil by . All aboard, 59 crew and 25 gunners, survived and were rescued the next day by (en)
- World War II: Convoy HX 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 36 of the 58 people aboard. Survivors were rescued by . (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of thirteen of her 47 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of the Azores by with the loss of all 145 crew. (en)
- World War II: The Type R-25 minesweeper was sunk by Soviet aircraft off Kerch, Soviet Union. (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of four of her 48 crew. Survivors were rescued by . (en)
- The ran aground near Osfles Rock, Iceland and was wrecked. Her crew were rescued by the naval trawler . (en)
- World War II: The cargo ship was torpedoed and sunk in the Yellow Sea off Korea by with the loss of twenty of her crew. (en)
- World War II: The cargo ship struck a mine and sank in the Mediterranean Sea. Also reported as bombed and sunk north east of Zembra, Tunisia by British aircraft. (en)
- The cargo ship ran aground in the evening at Ras Ahmer, west of Cape Bon and was wrecked. (en)
- World War II: The Siebel ferry was bombed and sunk at Palermo, Sicily, Italy. (en)
- World War II: The cargo ship was torpedoed and sunk in the Yellow Sea off the coast of Korea by . Thirty-seven of her crew were killed. (en)
- World War II: The Siebel ferry was bombed and sunk at Bizerta. (en)
- World War II: The was sunk by a mine in the Black Sea off cap Tulsa . Ten of her crew and 53 of the 67 troops aboard were killed or reported missing. (en)
- World War II: The motor fishing vessel was sunk by a mine in the Øresund. Both crew were killed. (en)
- World War II: Convoy HX 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . Her 53 crew were rescued by the convoy's escorts. (en)
- World War II: Convoy RS 3: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of the Canary Islands, Spain by with the loss of eleven of her 46 crew. Survivors were rescued by . (en)
- World War II: The tanker was damaged in a Allied air raid on Saint-Nazaire, Loire-Inférieure, France. She was repaired and returned to service. (en)
- The sank after a collision with off Myskhako. (en)
- The was lost on this date. (en)
- The MFP-A landing craft was sunk on this date. (en)
- The auxiliary minesweeper was sunk on this date. (en)
- The cargo ship foundered off the coast of Iceland. (en)
- The cargo ship was wrecked near Naples. (en)
- The landing craft vehicle was sunk off Inellan. (en)
- World War II: Convoy SC 121: The refrigerated cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean north west of Rockall, Inverness-shire by with the loss of all 62 crew. (en)
- World War II: The S 38 Type Schnellboot struck a mine and sank in the English Channel . Five of her crew were killed. (en)
- World War II: Convoy HX 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of all 80 crew. (en)
- World War II: The auxiliary submarine chaser was sunk by Allied aircraft. (en)
- World War II: The tanker was torpedoed and sunk in the Laotiehshan Channel by with the loss of 36 lives. (en)
- World War II: The collier was torpedoed and sunk in the Laotiehshan Channel by . (en)
- World War II: The fishing vessel was sunk with gunfire off Cap Ferrat, Alpes-Maritimes by . Her three crew were rescued by an Italian boat. (en)
- World War II: Convoy XK 2: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of seventeen of her 29 crew. Survivors were rescued by . (en)
- World War II: The Kurohime Maru-class auxiliary transport was torpedoed and sunk in the Pacific Ocean north east of Manus Island, Bismarck Archipelago by . Twenty-seven passengers and nine of her crew were killed. (en)
- World War II: Convoy HX 229: The whaling factory ship was torpedoed and sunk in the Atlantic Ocean by with the loss of six of her 199 crew. Survivors were rescued by . (en)
- World War II: Convoy OS 44: The cargo ship was torpedoed and damaged in the Atlantic Ocean west of Cape Finisterre, Spain by with the loss of 28 of her 94 crew. Survivors were rescued by , which scuttled Clan Alpine. (en)
- World War II: Convoy OS 44: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of Cape Finisterre (en)
- The patrol boat was sunk off Long Island, New York by an explosion probably caused by a gasoline leak. Only her commanding officer survived out of a crew of ten. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy: The was bombed and sunk in the Bismarck Sea near Finschhafen by Royal Australian Air Force and United States Army Air Forces aircraft. Thirty-two of her crew were killed. (en)
- World War II: The was shelled and sunk in the Pacific Ocean off Kairiru Island, New Guinea by , and with the loss of all 60 crew. (en)
- World War II: The cargo ship was bombed and sunk in the North Sea by Luftwaffe aircraft with the loss of all 44 people aboard. (en)
- World War II: The cargo ship struck a mine laid by a Soviet aircraft and sank in Tallinn Bay. (en)
- World War II: The auxiliary submarine chaser was torpedoed and sunk in the Bay of Palermo by . Five of her crew were killed. (en)
- World War II: The coaster was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: The Kasuga Maru-class auxiliary transport was torpedoed and sunk in Port Blair Harbor, Andaman Islands by . Twenty-one of her crew were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Derna, Libya by with the loss of 22 of her 37 crew. Survivors were rescued by HMSAS Southern Maid . (en)
- World War II: Convoy HX 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . Her 40 crew were rescued by . (en)
- World War II: The landing craft sank north of Cape Bon, Tunisia after an explosion, cause unknown. Thirteen of her crew were killed. Two of her crew and all four passengers were rescued. (en)
- World War II: The motor torpedo boat was sunk at Anapa Bay by German coastal defenses. (en)
- World War II: Battle of Blackett Strait: The was sunk by gunfire off Kolombangara, Solomon Islands, by and . All 71 crew were killed. (en)
- World War II: The was sunk at Sfax, Tunisia by Allied aircraft. (en)
- World War II: The sailing ship was shelled and sunk in the Mediterranean Sea off Haifa by . (en)
- World War II: Operation Creek: The cargo ship was sunk with explosives by British raiders at Mormugão. Also reported as scuttled by her crew. The wreck was refloated in 1950 and scrapped. (en)
- World War II: The cargo ship was hit by bombs during an attack on Palermo, Sicily, by Consolidated B-24 Liberator aircraft of 301st Bombardment Group, United States Army Air Force. She was loaded with ammunition and exploded, devastating the port and sinking several other ships. (en)
- World War II: The MO-4 Type minesweeper was sunk by a mine off Myskhako with the loss of 20 lives. There were 3 survivors. (en)
- World War II: Convoy UGS 6: The cargo ship was torpedoed and sunk in the Atlantic Ocean by . All 127 people aboard were rescued by . (en)
- World War II: The cargo ship, loaded with explosives and gasoline, caught fire while moored at Naples and was destroyed by a huge explosion that devastated the harbor, killing more than 600 people and injuring another 3,000. (en)
- World War II: Convoy SC 121: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of Rockall by with the loss of all 30 crew. (en)
- World War II: The fleet oiler was torpedoed and sunk in the Makassar Strait by . (en)
- World War II: Convoy HX 228: The Liberty ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 22 of her 73 crew. Survivors were rescued by , but only twelve of them survived the sinking of that ship. (en)
- World War II: The Vorpostenboot struck a mine in the North Sea and was damaged. She was taken in tow by but struck another mine the next day and sank with the loss of four of her crew. (en)
- World War II: The L-class destroyer was torpedoed and sunk in the Mediterranean Sea off the coast of Algeria by S 55 and S 158 . Forty-five of her crew were killed. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy, No. 1 Division : The Type 1C Standard cargo ship/transport was bombed and sunk southeast of Finschhafen, New Guinea by American and Australian aircraft. Forty-five crewmen and 278 troops were killed. Five Daihatsu landing craft went down with the ship. (en)
- World War II: The harbour defence motor launch was lost as cargo when , bombed by a Focke-Wulf Fw 200 aircraft of the Luftwaffe the day before, sank in the Atlantic Ocean off the coast Portugal. (en)
- World War II: The coaster was torpedoed and sunk in the Aegean Sea by . (en)
- The naval trawler ran aground and foundered off Rye Bay, Sussex. Three of her 24 crew members were lost, and eleven were slightly wounded. (en)
- The yard patrol craft struck a submerged breakwater and sank at the entrance to Port Everglades, Florida. (en)
- World War II: The schooner was sunk in the Black Sea near Novorossiysk by Kriegsmarine Schnellboote. (en)
- World War II: Convoy BT 6: The Liberty ship was torpedoed and sunk in the Atlantic Ocean by with the loss of one of her 55 crew. Survivors were rescued by . (en)
- World War II: Convoy SC 122: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean by . All 34 crew were rescued by . Carras was later scuttled by . (en)
- World War II: Convoy SC 122: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 52 crew. (en)
- The Ocean ship was torpedoed and sunk in the Atlantic Ocean by . (en)
- World War II: The coaster was torpedoed and sunk in the Mediterranean Sea by with the loss of nine of her ten crew. (en)
- World War II: Convoy SC 122: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of Cape Farewell by with the loss of all 55 crew. (en)
- World War II: Convoy KMF 12: The CAM ship was torpedoed and sunk in the Mediterranean Sea by Savoia-Marchetti S.79 aircraft of 105 Squadriglia, Regia Aeronautica with the loss of three lives. (en)
- World War II: The cargo liner was torpedoed and sunk in the Formosa Strait off North Keelung, Formosa, China by with the loss of 98 crew and 741 passengers, or with 844 passengers, crew and troops killed. (en)
- World War II: Convoy SC 121: The cargo ship straggled behind the convoy due to problems with her steering gear. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 44 crew. (en)
- World War II: Convoy DN 21: The Liberty ship was torpedoed and sunk in the Indian Ocean by . There were no casualties. All 42 crewmen and nineteen armed guards were rescued by or reached land in their lifeboats. (en)
- The Liberty ship broke in two and sank in the Atlantic Ocean off the coast of Iceland . (en)
- World War II: The struck two mines almost in the center of the Strait of Sicily . She was severely damaged and was abandoned by her crew. Fourteen or fifteen of her 158 crew died. Ciclone sank the next day. (en)
- The sank after a collision with a pilot boat off Augusta, Sicily with the loss of 28 of her crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Gulf of Mexico west of Cape San Antonio, Cuba by with the loss of three of her 46 crew. Survivors were rescued by and . (en)
- World War II: The motor sailboat/transport was captured by a Partizan boat and sunk. (en)
- World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean north west of Cape Finisterre by with the loss of all 57 crew. (en)
- While towing the barge Mercer No. 1 , the motor vessel was lost in Lynn Canal near Ralston Island. in the Alexander Archipelago, Territory of Alaska. Her entire crew – reported to be either six or seven people – perished. Wreckage from Highway was found on Ralston Island. (en)
- World War II: The s were sunk at Cagliari by British aircraft. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy, No. 1 Division : The transport ship was bombed and sunk south-east of Finschhafen, New Guinea by American and Australian aircraft. Her commanding officer, seventeen of her crew, fifteen gunners and 1,882 troops were killed. Also lost were six Daihatsu landing craft, fifteen collapsible boats, and six row boats. (en)
- World War II: The minesweeper struck a mine and sank in the English Channel off Boulogne, Pas-de-Calais, France. (en)
- World War II: The cargo ship struck a mine and sank in the North Sea. Five of her sixteen crew were lost. (en)
- World War II: Convoy KMS 11: The cargo ship was bombed and damaged in the Atlantic Ocean off the coast of Portugal by a Focke-Wulf Fw 200 aircraft of I Staffeln, Kampfgeschwader 40, Luftwaffe. She sank the next day . (en)
- World War II: The tug was sunk in a collision off North Carolina when two convoys respectively northbound and southbound met in bad visibility. She was rammed by and sank, but all hands were rescued. (en)
- World War II: Convoy HX 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 20 of the 84 people aboard. Survivors were rescued by . (en)
- World War II: The fishing boat was scuttled by her crew after being intercepted by a Kriegsmarine warship during a Shetland bus mission to occupied Norway. Of the twelve people on board ,one was killed and two were mortally wounded, while eight were captured and executed by the Germans. The final person on Brattholm, Jan Baalsrud, escaped to neutral Sweden. (en)
- World War II: Convoy UGS 6: The Liberty ship was torpedoed and damaged in the Atlantic Ocean by with the loss of three of her 72 crew. Survivors were rescued by and , which scuttled the ship. (en)
- World War II: Convoy XT 2: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Derna, Libya by with the loss of 129 of the 142 people aboard. Survivors were rescued by . (en)
- World War II: Operation Brandy: The cargo ship was torpedoed and sunk by and off Florø. Three of her crew were reported missing. (en)
- The landing craft personnel (large) was lost sometime in March. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off Bahia, Brazil by with the loss of two of her 111 crew. Two of the survivors were taken aboard U-518 as prisoners of war. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Duene, Bouches-du-Rhône, France by with the loss of eight of her 30 crew. (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean east of New Guinea by Japanese aircraft. (en)
- World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by with the loss of all hands. (en)
- World War II: Convoy HX 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by with the loss of one of the 81 people aboard. Survivors were rescued by . (en)
- World War II: The naval trawler struck a mine and sank in the North Sea about east south east of Orfordness, Suffolk with the loss of one of her 29 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea by . There were ten missing and sixteen survivors. (en)
- World War II: The tanker was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: The cargo ship was attacked by Japanese aircraft and was beached in Oro Bay. Her 72 crew survived. She was subsequently refloated and towed to Sydney, New South Wales, Australia. (en)
- World War II: The was torpedoed and sunk south of Darien, China by . Sixteen of her crew were killed. (en)
- World War II: Convoy ET 16: The tanker was torpedoed and sunk in the Mediterranean Sea by . Her 44 crew survived. (en)
- World War II: The cargo ship collided with in a convoy and sank off Peterhead, Aberdeenshire, United Kingdom with the loss of nineteen of her crew. Atland was on a voyage from New York, United States to London, United Kingdom. (en)
- World War II: Convoy ONS 169: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean north west of Belle Isle, Dominion of Newfoundland by with the loss of all 42 crew. (en)
- World War II: The cargo ship was scuttled at Mormugão. She was refloated in 1948 and was scrapped at Goa, Portuguese India, in 1950. (en)
- World War II: Tunisian campaign: The cargo ship was driven ashore during the evacuation of Tunisia. She was refloated. (en)
- World War II: Convoy F-2: The British WWI Type C Class standard cargo ship was torpedoed and sunk in the Pacific Ocean west of Manus Island, Admiralty Islands by . Four of her crew were killed. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged, rammed and sunk by in the Atlantic Ocean with the loss of 26 of her 46 crew. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy No. 1 Division : The Shinia Maru-class auxiliary transport was bombed and sunk south east of Finschhafen by American and Australian aircraft. Eighteen crewmen, 45 gunners and an unknown number of troops were killed. (en)
- World War II: The Type IX submarine was depth charged and sunk in the Atlantic Ocean by with the loss of all 53 crew. (en)
- World War II: The patrol boat was sunk by shellfire in the East China Sea by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Aegean Sea by . (en)
- World War II: Convoy SL 126: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of Cape Finisterre, Spain by with the loss of four of her 50 crew. Survivors were rescued by (en)
- World War II: Convoy SC 121: The landing craft tank was being transported as deck cargo aboard and was lost when that ship was torpedoed and sunk by a and/or . (en)
- World War II: Convoy SC 121: The cargo ship was torpedoed and sunk in the Atlantic Ocean by and/or with the loss of 37 people including her Master, the Convoy Commodore and his staff, and crew. Survivors were rescued by and . (en)
- World War II: The cargo ship was bombed and damaged at Murmansk, Soviet Union. (en)
- World War II: The coaster was torpedoed and sunk in the Mediterranean Sea west of Cape Calava, Sicily by . Four of her crew were killed. (en)
- World War II: The struck a mine and sank in the Mediterranean Sea. Four hundred and seventy-four men died . There were 59 survivors . (en)
- World War II: Convoy HX 228: The H-class destroyer was torpedoed and sunk in the Atlantic Ocean by with the loss of 145 crew and 39 survivors of . (en)
- The sank in the Firth of Clyde after an internal explosion, with the loss of 379 of her 528 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Cape Scalea, Italy by . (en)
- World War II: The cargo ship was set afire and scuttled at Mormugao, Portuguese India. She was refloated in 1948 and scrapped in 1949. (en)
- World War II: The sperrbrecher struck a mine in the North Sea with the loss of one life. She sank the next day at . (en)
- World War II: The tanker was torpedoed and sunk in the Mediterranean Sea north east of Punta Milazzo, Sicily by . (en)
- World War II: Convoy HX 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 36 of her 97 crew. Survivors were rescued by . (en)
- World War II: The coaster struck a mine and sank at Sunnfjodleia. (en)
- World War II: Convoy GAT 49: The tanker was torpedoed and sunk in the Caribbean Sea by with the loss of two of her 54 crew. Survivors were rescued by . (en)
- World War II: The was struck by a "Motobomba" torpedo dropped by a Regia Aeronautica aircraft in the harbor at Tripoli, Libya, and was beached to prevent her from sinking. Six of her crew were killed. She underwent temporary repairs and was towed to the United Kingdom, but her repairs were never completed, and she was scrapped in 1947. (en)
- World War II: The T-class submarine struck a mine and sank in the Mediterranean Sea off La Maddelena, Sardinia, Italy with the loss of all 61 crew. (en)
- World War II: The T-class submarine depth charged and sunk in the Mediterranean Sea off Sicily by with the loss of all 62 crew. (en)
- World War II: Convoy HX 229: The Liberty ship was torpedoed and damaged in the Atlantic Ocean by . Some of those aboard abandoned ship and were either drowned or rescued by . An attempt was made to sail James Oglethorpe to St. John's, Dominion of Newfoundland but she either foundered or was sunk by a coup de grâce from . Forty-four of the 74 people aboard were lost. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea north west of Marettimo, Sicily, Italy by aircraft based on Malta. and rescued 63 survivors of the approximately 100 men aboard. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Honshu by . (en)
- World War II: The motor gun boat was shelled and sunk off Terschelling, Friesland, Netherlands by Kriegsmarine warships. Fifteen of her 25 crew were killed, and the survivors were captured. (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea off Terschelling by and . Her nineteen crew were rescued. (en)
- World War II: Convoy HX 229: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean by and . Her 94 crew were rescued by and before the former scuttled Nariva. (en)
- World War II: Convoy UGS 6: The Liberty ship, on her maiden voyage, straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean west of Lisbon, Portugal by with the loss of four of her 70 crew. Survivors were rescued by , and . Molly Pitcher was later sunk by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean south east of Mossel Bay, Union of South Africa by with the loss of seven of her 58 crew. Survivors were rescued by R-7 . (en)
- World War II: The Yoshida Maru No. 1-class auxiliary transport was torpedoed and sunk north of Soerabaya, Java, Netherlands East Indies by . Eight of her crew were killed. (en)
- World War II: The Type VIIC submarine was depth charged and damaged in the Atlantic Ocean south of Cape Nao, Spain by Lockheed Hudson aircraft of 48 and 233 Squadrons, Royal Air Force. She sank the next day with the loss of 38 of her 47 crew. (en)
- World War II: Convoy SC 121: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by with the loss of 46 of her 51 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of the Azores, Portugal by with the loss of 50 of her 74 crew. One survivor was taken aboard U-515 as a prisoner of war. (en)
- World War II: The Ocean ship was torpedoed and damaged in the Mediterranean Sea by . She was beached at Algiers, Algeria but was declared a total loss. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Cape Spartivento, Sardinia, Italy by . Ten of her 24 crew were killed. (en)
- World War II: The Type S 38 Schnellboot collided with off the Sunk Lightship during an attack on a Royal Navy destroyer. Her crew were rescued by S 114. She was scuttled by . (en)
- World War II: Convoy RS 3: The cargo ship was torpedoed and sunk southeast of the Canary Islands by with the loss of 62 of her 69 crew. (en)
- World War II: The cargo ship was intercepted in the Atlantic Ocean by and was scuttled by her crew. (en)
- World War II: Convoy KMF 12: The cargo ship was torpedoed and sunk in the Mediterranean Sea by Heinkel He 111 aircraft of I Staffeln, Kampfgeschwader 26, Luftwaffe with the loss of eleven lives. (en)
- World War II: The Liberty ship was torpedoed and sunk in the Indian Ocean off Durban, South Africa by with the loss of one of her 63 crew. Survivors were rescued by , and a South African Air Force rescue boat. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off the coast of Sicily by . (en)
- World War II: Convoy SC 122: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of thirteen of her 43 crew. Survivors were rescued by . (en)
- World War II: The Type R 41 minesweeper struck a mine and sank in the English Channel off Boulogne, Pas-de-Calais, France. (en)
- World War II: Convoy DN 21: The cargo ship was torpedoed and damaged in the Indian Ocean by with the loss of one of her 48 crew. She was abandoned, but was later towed to East London, Union of South Africa. Sheaf Crown was later repaired and returned to service. (en)
- World War II: Convoy ET 14: The cargo ship was torpedoed and damaged in the Mediterranean Sea north west of Oran, Algeria by with the loss of two of her 52 crew. Survivors were rescued by . Hadleigh was taken in tow by the tug and beached at Mers El Kébir, Algeria. She later broke in two and was declared a total loss. (en)
- World War II: The cargo ship was sunk by torpedo in the Indian Ocean off the coast of Natal by with the loss of nine of her 41 crew. rescued 32 survivors. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy: The was bombed and sunk in the Bismarck Sea near Finschhafen by Royal Australian Air Force and United States Army Air Forces aircraft. She was lost with some 200 men with some survivors, or was lost with all crew. (en)
- World War II: Convoy SC 121: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland by with the loss of 46 of her 49 crew. Survivors were rescued by . (en)
- World War II: Convoy SC 121: The cargo ship straggled behind the convoy due to being ordered to rescue survivors from . She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 46 crew. (en)
- World War II: Battle of the Bismarck Sea: Operation 81-transport convoy, No. 2 Division : The Type 1A Standard transport was bombed and damaged southeast of Finschhafen by American and Australian aircraft. She was finished off that night by USS PT-143 and . Seventy-eight crewmen and 1,151 troops were killed. (en)
- World War II: The Type 1939/40 Schnellboot sank after an air attack by Supermarine Spitfire and Hawker Typhoon aircraft of the Royal Air Force. Eleven of her crew were killed. (en)
- The No. 1-class landing boat was lost on this date. (en)
- World War II: The Type VIIB submarine was sunk in the Atlantic Ocean by and with the loss of all 50 crew. (en)
- World War II: Convoy HX 228: The landing craft tank was lost as deck cargo aboard when that ship was torpedoed and sunk by . (en)
- World War II: The troopship was torpedoed and sunk in the Atlantic Ocean south of Cape Palmas, Liberia by with the loss of 392 of the 1,752 people on board. (en)
- World War II: The cargo ship was bombed and damaged at Tripoli by Junkers Ju 88 aircraft of Kampfgeschwader 30 and Kampfgeschwader 77, Luftwaffe. She was consequently declared a total loss. Two of her crew were killed. (en)
- World War II: The tanker was sunk at Wilhelmshaven in an American air raid. (en)
- World War II: The cargo ship was sunk during an attack on Palermo by Consolidated B-24 Liberator aircraft of 301st Bombardment Group, United States Army Air Force, either by bombs or by the explosion of the ammunition ship . (en)
- thumb|Kembu Maru
World War II: Battle of the Bismarck Sea: Operation 81-transport convoy, No. 1 Division : The Kenbu Maru-class auxiliary transport was bombed by American and Australian aircraft south-east of Finschhafen . She exploded and sank. Twenty troops were killed. (en)
- World War II: Convoy XK 2: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of three of her 47 crew. Survivors were rescued by . (en)
- World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean south of Madeira, Portugal by a Consolidated B-24 Liberator aircraft of the United States Army Air Force with the loss of all 52 crew. (en)
- World War II: The auxiliary minesweeper, a requisitioned fishing schooner, was bombed and sunk at Palermo in an Allied air raid. (en)
- World War II: The naval drifter was sunk in Dover Harbour by a near miss from a German long-range shell. A crew member was killed. (en)
- World War II: The cargo ship was scuttled at Mormugão. The wreck was subsequently broken up in situ. (en)
- The landing craft personnel (ramped) were deck cargo aboard and were lost when that ship was torpedoed and sunk in the Indian Ocean by . (en)
- World War II: Convoy RA 53: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Norwegian Sea north east of Iceland by with the loss of 64 of her 65 crew. The survivor was rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off Aracaju, Brazil by with the loss of one of her 26 crew. Three survivors were taken aboard U-518 as prisoners of war. The rest of them were rescued by . (en)
- World War II: The sailing ship was shelled and sunk in the Mediterranean Sea off Haifa, Palestine by . Her eight crew survived. (en)
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