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- World War II: The naval trawler struck a mine and sank in the Barents Sea off Chernyj Kame Island in the Matochkin Shar Strait with the loss of 25 of her 48 crew. (en)
- World War II: The salvage tug was torpedoed and sunk at Khoms, Libya by while working on the beached . (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic north west of Cape Town by with the loss of 12 of her 61 crew. Survivors were rescued by and . (en)
- World War II: The netlayer was bombed and sunk at Rabaul, Papua New Guinea by Boeing B-17 Flying Fortress aircraft of the United States Army Air Force. (en)
- World War II: The tanker was bombed, torpedoed and sunk in the Red Sea off Ras Gharib, Egypt by Heinkel He 111 aircraft of the Luftwaffe with the loss of 11 of her 48 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean south west of Kavieng, New Ireland, Papua New Guinea by . Eight of her crew were killed. (en)
- World War II: The cargo ship foundered east of Tiền Hải, French Indochina . (en)
- The fishing vessel sank after striking a reef in the Geese Island Channel at the southern end of Kodiak Island, Territory of Alaska. (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean east of the Belle Isle Strait by with the loss of all 49 crew. (en)
- World War II: The patrol boat was shelled and sunk by Kriegsmarine Siebel ferries in Lake Ladoga near Sukho Island. Nine of her crew were rescued and made prisoners of war. (en)
- World War II: The was torpedoed and sunk in the Pacific Ocean off the eastern coast of Kyūshū by . Five of her crew were killed. (en)
- World War II: Convoy ON 137: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with 13 gunners and 33 of her crew drowning in exceptionally high seas. Survivors, four gunners and four of her crew, were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north east of the Faroe Islands by a Vickers Wellington aircraft of 179 Squadron, Royal Air Force. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Ras el Tin, Egypt by British aircraft. There were no casualties. (en)
- World War II: Convoy HX 212: The tanker was torpedoed and damaged in the Atlantic Ocean by with the loss of 43 of her 57 crew. Survivors were rescued by and , which scuttled the ship. (en)
- World War II: The cargo ship was torpedoed and damaged in the Sunda Strait by and was beached. She was subsequently towed to Singapore for repairs. (en)
- World War II: The passenger ferry was torpedoed and sunk in the Cabot Strait by with the loss of 136 of the 237 people on board. (en)
- World War II: The tug was sunk in the Port of Astrakhan by Luftwaffe aircraft with the loss of 13 of her passengers and crew. (en)
- The cargo ship ran aground and was wrecked off Volos. (en)
- World War II: The cargo ship was torpedoed and sunk off the mouth of the Sulina River by . Three of her 50 crew were lost. (en)
- World War II: The sailing ship was shelled and sunk in the Mediterranean Sea north west of Saida, Lebanon by . Her crew survived. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean east of Barbados by with the loss of two of her 40 crew. (en)
- World War II: The Liberty ship was torpedoed and damaged in the Indian Ocean east of East London, Union of South Africa by with the loss of three of her 57 crew. Survivors were rescued by and a South African fishing vessel. An attempt was made to tow Anne Hutchinson by . She was later split in two by explosive charges, with the stern section sinking. The bow section was towed to Port Elizabeth by HMSAS David Haigh, where the ship was declared a total loss. (en)
- World War II: The cargo ship was torpedoed and damaged in the North Sea off Cromer, Norfolk by , , , , and . She was taken in tow but consequently broke in two and sank. She was raised, repaired, and returned to service in 1944. (en)
- World War II: Convoy SL 125: The refrigerated cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean (en)
- The cargo ship was lost with all hands in the Caspian Sea between Baku and Krasnovodsk from unknown causes. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic south east of Cape Agulhas, Union of South Africa by . All 63 people on board were rescued by , or a South African Air Force rescue boat. (en)
- World War II: The was shelled and sunk off the Netherlands by Kriegsmarine surface ships. One of her crew was killed. (en)
- World War II: The transport ship was torpedoed and sunk in the Black Sea east of Lake Shahany by . She was carrying more than 2,000 Soviet prisoners of war and, depending on sources, between 1,200 and 2,080 of them were lost, together with between two and six Germans. (en)
- World War II: The ocean liner was torpedoed and sunk in the Atlantic Ocean south west of Monrovia, Liberia by with the loss of five of the 48 people on board. 26 of the survivors were taken as prisoners of war. (en)
- World War II: The cargo ship was sunk in a Luftwaffe air raid on "Chopi". (en)
- World War II: The Type VIIC submarine was depth charged, rammed and sunk in the Atlantic Ocean by with the loss of six of her 45 crew. Survivors were rescued by and HMS Fame. (en)
- World War II: The , carrying 1,816 British prisoners of war and 778 Imperial Japanese Army troops, sank due to torpedo damage inflicted the previous day north of Chushan Island, China by . Three guards and 826 POWs were killed; most of the POWs killed were shot by guards while attempting to abandon ship. Troops were rescued by a destroyer, by , POWs by Chinese junks, along with the auxiliary gunboat which rescued 57 troops, and the auxiliary transport which rescued 348 troops. (en)
- World War II: Oki Transportation Movement: Convoy Oki Part 1: The Naminoue Maru-class auxiliary troopship was torpedoed and sunk in the Pacific Ocean off Rabaul, New Britain Papua New Guinea by . There were 279 survivors. They were rescued by . Two people were killed. (en)
- World War II: The was sunk by a mine in the North Sea. (en)
- World War II: The was bombed and sunk in the Gulf of Finland by Finnish Air Force aircraft with the loss of all hands. (en)
- World War II: Battle of Sukho Island: The Siebel ferry was shelled and sunk by Soviet shore batteries at Sukho Island in Lake Ladoga. (en)
- World War II: The tanker was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: The cargo liner was torpedoed and sunk in the Atlantic Ocean off Cape Palmas, Liberia by with the loss of four of the 252 people on board. Survivors were rescued by . (en)
- World War II: The transport ship was torpedoed by in the Straits of Malacca. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the eastern coast of Kyūshū by . (en)
- World War II: The naval trawler was torpedoed and sunk in the English Channel off the Eddystone Lighthouse by with the loss of all 18 crew. (en)
- The collided with the Volodarsky Bridge, Leningrad and was damaged. She was subsequently repaired and returned to service. (en)
- World War II: The M-class submarine was sunk in the Black Sea off Cape Burnas by and , or the next day by a Luftwaffe aircraft. All 21 crew were lost. (en)
- World War II: The was sunk in the Gulf of Finland by patrol boats VMV 13 and VMV 15 . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Mediterranean Sea by , , , and with the loss of seven of her 45 crew. (en)
- World War II: the cargo ship was torpedoed and sunk by west of Palermo, Sicily, killing 123 British Indian Army prisoners of war and an Italian soldier. There were 321 survivors. (en)
- World War II: The tanker was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic west south west of Cape Town by with the loss of 61 of the 128 people on board, including eight survivors from . Survivors were rescued by . (en)
- The minesweeper/naval trawler capsized and sank in the Hooghli River when struck by a wave during a cyclone while at anchor at Diamond Harbour off Haldi River Buoy. (en)
- World War II: Convoy SL 125: The troopship was torpedoed and sunk in the Atlantic Ocean north east of Madeira by with the loss of 260 of the 345 people on board. Survivors were rescued by and . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off the coast of Surinam by . Her 48 crew were rescued by . (en)
- World War II: The was sunk west of San Cristobal by an American Consolidated PBY Catalina aircraft. (en)
- World War II: The submarine hunter struck a mine and sank in the Gulf of Finland with the loss of 45 of her crew. (en)
- World War II: Convoy SC 104: The whale factory ship was torpedoed and sunk in the Atlantic Ocean north east of St. John's, Dominion of Newfoundland by with the loss of 48 of her 125 crew. Survivors were rescued by . Ten landing craft carried as deck cargo were also lost. (en)
- World War II: The cargo ship was torpedoed and damaged in the Mediterranean Sea by Allied aircraft, or by . She was taken in tow by , but was torpedoed and sunk the next day by . There were 78 survivors. (en)
- World War II: The was torpedoed and sunk in the Mediterranean Sea north west of Lampedusa by . There were 20 killed and 255 survivors. (en)
- World War II: The Liberty ship was torpedoed, shelled and sunk in the Caribbean Sea by and with the loss of eight of her 61 crew. Survivors were rescued by and . (en)
- World War II: The sperrbrecher struck a mine and sank in the North Sea off Nieuwpoort, West Flanders, Belgium . One source says five of her crew were killed, another says there were no casualties. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off the coast of the Union of South Africa by with the loss of seven of her 53 crew. Survivors were rescued by , and . (en)
- World War II: The Design 1022 ship was torpedoed and sunk in the Atlantic Ocean south of the Cape of Good Hope, Union of South Africa by with the loss of 11 of her 51 crew. Survivors were rescued by . (en)
- World War II: The cargo liner was torpedoed and sunk in the South China Sea off the coast of French Indochina by . (en)
- World War II: Convoy SL 125: The tanker straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean south west of the Canary Islands, Spain by . She was torpedoed and sunk the next day at by . Her 35 crew survived. (en)
- World War II: Convoy FN 32: The Fairmile B motor launch was torpedoed and sunk in the North Sea off Cromer by (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of two of her 33 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean east of Durban by with the loss of all 47 crew. (en)
- World War II: Convoy SL 125: The cargo liner was torpedoed and sunk in the Atlantic Ocean by with the loss of 44 of the 246 people on board. Survivors were rescued by . (en)
- The Project 1125 armored motor gunboat was lost on this date. (en)
- World War II: The cargo ship was torpedoed and sunk in the Bungo Channel by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the coast of Japan by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean southwest of Iceland by a Consolidated PBY Catalina aircraft of the United States Navy with the loss of all 46 crew. (en)
- The Landing Craft, Mechanized was lost sometime in October. (en)
- World War II: The Hakubasan Maru-class auxiliary transport was torpedoed and sunk in the Pacific Ocean east of Horamachi-shi, Fukushima Prefecture by . 14 of her crew were killed. (en)
- World War II: The Type C1 submarine was depth charged and sunk in the Coral Sea south east of San Cristobal Island by a United States Navy Consolidated PBY Catalina aircraft with the loss of all 100 hands. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic west north west of Cape Town, Union of South Africa by with the loss of one of the 99 people on board. Survivors were rescued by . (en)
- The motor vessel was wrecked on the north end of Kayak Island, Territory of Alaska. (en)
- World War II: The cargo ship was torpedoed and damaged off Vilnesfjord, Norway by . She was beached, but was declared a constructive total loss. (en)
- World War II: The S-class submarine was torpedoed and sunk in the Baltic Sea by with the loss of 44 of her 48 crew. Survivors were taken as prisoners of war. (en)
- World War II: The barge was sunk in the Port of Astrakhan by Luftwaffe aircraft. A crew member was killed. Eight survivors were rescued by M-14 . (en)
- The was lost during the month. (en)
- The was lost on this date. (en)
- The naval trawler was lost on this date. (en)
- World War II: The tanker was torpedoed and sunk in the Aegean Sea south of Chios, Greece by . Her 25 crew survived the sinking. (en)
- World War II: The transport ship struck a mine and sank in the English Channel north east of Calais, France. (en)
- World War II: The Sperrbrecher struck a mine and broke in two in the North Sea off Ameland, Friesland, Netherlands. Her stern section was towed to Hamburg. She was repaired and returned to service post-war. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Cape Point, Union of South Africa by with the loss of five of her 36 crew. Survivors were rescued by and . (en)
- World War II: The tug was sunk by Allied action. (en)
- World War II: The cargo ship was torpedoed and sunk in the East China Sea, north of Formosa, China by . (en)
- The tug sank with the loss of all hands near Tree Point , between Ketchikan, Territory of Alaska, and Prince Rupert, British Columbia, Canada. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off the coast of Libya by British aircraft. All 80 men aboard were killed. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north east of the Azores, Portugal by a Consolidated B-24 Liberator of 224 Squadron, Royal Air Force with the loss of all 44 crew. (en)
- World War II: The seal catcher caught fire and sank in the Hudson Strait and was abandoned by her 16 crew. She may have struck a mine. (en)
- World War II: The cargo ship was torpedoed and sunk east south east of Masulipatam, India by in the Indian Ocean . Eight of her crew were killed. Survivors sailed in lifeboats to Pallaur, India. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off the coast of Libya by . A crew member was lost. (en)
- The Ceres-class cruiser was rammed, cut in half, and sunk north of Ireland by . Only 26 of her crew 460 survived. (en)
- World War II: The Eastern Shore-class auxiliary transport ship was torpedoed and sunk in the Pacific Ocean west north west of Rabaul, Papua New Guinea by . Five crew were killed. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Iceland by a Consolidated B-24 Liberator aircraft of 120 Squadron, Royal Air Force with the loss of all 49 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic south west of Cape Town, Union of South Africa by with the loss of 25 of her 60 crew. Survivors were rescued by and . (en)
- World War II: The cargo ship was torpedoed and sunk in the North Sea off Terschelling by HMMGB 18, HMMGB 21, HMMGB 81, HMMGB 86, HMMTB 230 and HMMTB 234 with the loss of nine of her 22 crew. (en)
- thumb|President Coolidge World War II: The troopship struck a mine in the Pacific Ocean off Espiritu Santo, Solomon Islands and sank. Of the 5,342 people on board, two lost their lives. (en)
- World War II: The cargo ship was torpedoed and sunk in the South China Sea west of Formosa by . (en)
- World War II: The was torpedoed, bombed and sunk in the Pacific Ocean off Guadalcanal by Japanese aircraft with the loss of 180 of her 261 crew. Survivors were rescued by , , and a Consolidated PBY Catalina aircraft . (en)
- World War II: Convoy ONS 136: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 46 crew. (en)
- World War II: The struck a mine and sank in the Black Sea off Tulcea, Romania. (en)
- World War II: The Vorpostenboot was torpedoed and sunk in the North Sea off Terschelling, Friesland, Netherlands by HMMGB 18, HMMGB 21, HMMGB 81, HMMGB 86, HMMTB 230 and HMMTB 234 . 21 crew were killed. (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean south south east of Cape Farewell, Greenland by with the loss of 16 of her 55 crew. Survivors were rescued by (en)
- World War II: The ore carrier struck a ]mine and sank in the Kattegat north of Sjællands Odde, Denmark . Her crew survived. (en)
- World War II: The cargo ship was torpedoed and damaged in the Baltic Sea north of Liepāja, Latvia by and was beached. She was later salvaged. (en)
- World War II: The cargo ship was torpedoed and sunk at Ystad, Sweden by with the loss of a crew member and three others wounded. Also reported as striking a mine and sinking north of Cap Arkona. (en)
- World War II: The tanker was torpedoed and damaged in the Mediterranean Sea by . She was abandoned by her crew. Panuco was later towed to Taranto. She was subsequently repaired and returned to service. (en)
- World War II: Battle of Stalingrad: The armoured motor gunboat was shelled and sunk in the Volga River at Stalingrad by German artillery. Four of her crew were killed. The wreck was salvaged in 2017 for restoration as a memorial. (en)
- World War II: Convoy SL 125: The cargo ship was torpedoed and sunk in the Atlantic Ocean northwest of the Canary Islands by with the loss of 20 of her 73 crew. Survivors were rescued by or reached land in their lifeboats. (en)
- World War II: The was shelled and sunk in the North Sea by Kriegsmarine Schnellboote. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Cape Town by with the loss of 28 of her 33 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south of Cape Town, Union of South Africa by with the loss of five of her 59 crew. Survivors were rescued by and . (en)
- World War II: Convoy FN 33: The cargo ship collided with and sank in the North Sea . Her 23 crew were rescued by HMML 201 . (en)
- World War II: Convoy SC 103: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 45 crew. (en)
- World War II: The aircraft ferry was torpedoed and sunk in the Pacific Ocean west of Bougainville Island, Papua New Guinea by . Two of her crew and 27 gunners were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of seven of her 95 crew. The survivors, and all 38 survivors from were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Freetown, Sierra Leone by with the loss of five of her 43 crew. Survivors were rescued by . (en)
- World War II: The Type IXC submarine struck a mine and sank in the Bay of Biscay off Lorient, Morbihan, France with the loss of 22 of her 52 crew. (en)
- World War II: The Tonan Maru No. 2-class auxiliary oiler was torpedoed and sunk in shallow water inside Kavieng Harbour, New Ireland, Papua New Guinea by . She had been refloated by the end of November, and returned to service by end of the year. (en)
- World War II: The cargo ship was torpedoed and sunk in the Caribbean Sea by with the loss of four of her 40 crew. Survivors were rescued by . (en)
- World War II: The was shelled and sunk in the Pacific Ocean off Tulagi, Solomon Islands by , and with the loss of one of her 80 crew. (en)
- World War II: The cargo ship struck a mine and was damaged in the Yugor Strait . She was taken in tow by and but foundered at ). Her crew survived. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the eastern coast of Kyūshū by . (en)
- World War II: The Type VIIC submarine was rammed and sunk in the Atlantic Ocean by with the loss of all 44 crew. (en)
- World War II: The guard ship was shelled and sunk in the Pacific Ocean by . (en)
- World War II: Battle of the Santa Cruz Islands: The was torpedoed and damaged in the Pacific Ocean north east of Guadalcanal, Solomon Islands by a torpedo from a crashed Grumman TBF Avenger aircraft United States Navy. She was subsequently scuttled by due to damage received. 15 of her crew were killed or died of their wounds. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic south of Cape Town, Union of South Africa by with the loss off three of the 50 people on board. Survivors were rescued by and . (en)
- World War II: The was torpedoed and sunk in the Pacific Ocean west of Seattle, Washington, United States by with the loss of all 50 hands. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 42 of the 103 people on board. Survivors were rescued by . (en)
- World War II: Convoy ON 139: The passenger ship was torpedoed and sunk in the Atlantic Ocean by . All 192 people on board were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean east south east of Durban, Union of South Africa by with the loss of five of the 57 people on board. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Caribbean Sea west of Trinidad by with the loss of six of her 36 crew. Survivors were rescued by . (en)
- World War II: Battle of Sukho Island: The Siebel ferry ran aground and was shelled and sunk, or scuttled, in shallow water, only partially submerged, by Soviet shore batteries at Sukho Island in Lake Ladoga. (en)
- World War II: The cargo ship was shelled and sunk in the Mediterranean Sea by . Two of her crew were wounded. (en)
- World War II: Convoy SL 125: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean north west of the Canary Islands, Spain by . She was torpedoed, shelled and sunk the next day at by with the loss of five of her 45 crew. Survivors were rescued by or reached land in their lifeboat. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic west of Port Nolloth, Union of South Africa by with the loss of 33 of her 44 crew. One crew member was taken on board U-172 as a prisoner of war, the rest of them were rescued by . (en)
- The cargo ship collided with and sank in the Atlantic Ocean off Halifax, Nova Scotia, Canada . (en)
- World War II: The barge was sunk in the Volgo-Caspian Channel by Luftwaffe aircraft. Five of her passenger and crew killed. Nine passengers and crew were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off the coast of Libya by British aircraft. There were 25 dead and eight survivors. (en)
- World War II: The sailing ship was machine gunned and damaged in the Mediterranean Sea off Alexandria by . She was beached on a reef and was declared a total loss. (en)
- World War II: The coaster was torpedoed and damaged in the Adriatic Sea by . She put into Split, Yugoslavia. Two tugs were sent to her assistance. They rescued 173 survivors . There were 35 killed and 16 missing. She was not repaired until after the end of the war. (en)
- World War II: Continuation War: The cargo ship was torpedoed and sunk south of Mariehamn, Åland ) by . (en)
- World War II: The cargo ship was attacked by United States Army Air Force, United States Marine and United States Navy aircraft in the Pacific Ocean . She was beached and was consequently declared a total loss. (en)
- World War II: Battle of Cape Esperance: Whilst retiring from the battle, the destroyer was bombed and severely damaged by American aircraft from Henderson Field, Guadalcanal, Solomon Islands. She was scuttled by west north west of Savo Island. (en)
- World War II: Convoy SL 125: The cargo ship was torpedoed and sunk in the Atlantic Ocean north of Madeira, Portugal by . All 49 crew were rescued by . (en)
- World War II: Convoy NL 9: The cargo ship was torpedoed and sunk in the Gulf of St. Lawrence by with the loss of 11 of her 30 crew. Survivors were rescued by and . (en)
- World War II: Convoy HX 209: The cargo ship was torpedoed by . She broke in two and the bow section foundered in the Atlantic Ocean with the loss of eight gunners and 20 of her crew. The stern section remained afloat and was scuttled the next day at by HMS Borage . HMS Borage also rescued her survivors, nine gunners and 24 crewmen. (en)
- The torpedo boat sank at Varna, due to a magazine explosion. She was refloated and repaired. (en)
- The MO-4-class motor anti-submarine boat was lost on this date. (en)
- World War II: Convoy HX 212: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 24 of the 114 people on board. Survivors were rescued by . (en)
- World War II: The troopship struck a mine and sank in the North Sea off Terschelling, Friesland, Netherlands . (en)
- World War II: Battle of Cape Esperance: Whilst retiring from the battle, the destroyer was bombed and sunk by American aircraft from Henderson Field, west north west of Savo Island. (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean northeast of St. John's by with the loss of 38 of her 59 crew. Survivors were rescued by . (en)
- World War II: Convoy SL 125: The tanker was torpedoed and damaged in the Atlantic Ocean by . She consequently straggled behind the convoy and was torpedoed and sunk at by with the loss of 50 of her 56 crew. (en)
- World War II: The naval trawler/patrol boat was shelled and sunk in the Pacific Ocean off Tulagi by , and . (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean east of the Belle Isle Strait by with the loss of 19 of her 29 crew. Survivors were rescued by . (en)
- World War II: The tanker was torpedoed and sunk in the Atlantic Ocean south east of the Cape of Good Hope by . Her 33 crew were rescued by a Royal Navy minesweeper. (en)
- World War II: The cargo ship was torpedoed and sunk in the Caribbean Sea north west of Guadeloupe by . Her 43 crew survived. (en)
- World War II: The cargo ship was torpedoed and sunk in the Aegean Sea by with the loss of four lives. (en)
- World War II: The cargo shi was torpedoed and sunk in the Mediterranean Sea west of the Peloponnese, Greece by with the loss of 88 of the 151 people on board. (en)
- World War II: The was torpedoed and damaged in the Atlantic Ocean west of Pointe Noire, French Equatorial Africa by with the loss of 42 of her crew. She was beached at Pointe Noire. Later salvaged, she was repaired and returned to service in August 1943. (en)
- World War II: The cargo ship was torpedoed and sunk in the Bay of Bengal by . Her 99 crew survived. (en)
- The Landing Craft, Mechanized was lost on this date. (en)
- World War II: The Type A Marinefahrprahm was damaged beyond repair in the Black Sea off Ak-Burnu by a German mine and was towed to Kertch, Soviet Union, or sank while under tow. There were two wounded. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean south east of East London, Union of South Africa by with the loss of two of her 89 crew. Survivors were rescued by , and . (en)
- World War II: The Type IXC submarine was bombed and sunk in the Atlantic Ocean by a Douglas B-18 Bolo aircraft of the 99th Bombardment Group, United States Army Air Force, with the loss of 51 of her 52 crew. The survivor was rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the coast of Japan by . (en)
- World War II: The cargo ship was torpedoed and sunk off the coast of Japan by . (en)
- World War II: The Ocean ship was torpedoed and sunk in the Indian Ocean by . A Royal Air Force crash boat towed the survivor's lifeboats to Ras al Hadd Harbor. (en)
- World War II: The minelayer struck a mine and sank south of Sanremo, Italy. (en)
- The yard patrol boat/naval trawler disappeared without trace with her seventeen crew. She was on a voyage from Pearl Harbor to Midway Island via the French Frigate Shoals. Cause is unknown. (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 14 of her 35 crew. (en)
- World War II: The Type VIID submarine was depth charged and sunk in the Atlantic Ocean south west of Ireland by a Consolidated B-24 Liberator aircraft of 224 Squadron, Royal Air Force with the loss of all 45 crew. (en)
- World War II: The transport ship was torpedoed and sunk off the Kuril Islands by . Eight crew were killed. (en)
- World War II: The tanker was torpedoed and damaged in the Pacific Ocean off the coast of Oregon by . Four gunners and two crew were killed. Survivors rescued by . Larry Doheny sank the next day. (en)
- World War II: Convoy ONS 136: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 46 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off Georgetown, British Guiana by with the loss of six of her 49 crew. Survivors were rescued by and . (en)
- World War II: The Kinsen Maru-class auxiliary gunboat was shelled and sunk in the Pacific Ocean about south west of Rotcher Island, Gilbert Islands by and . She was lost with all hands. (en)
- World War II: The struck a mine and sank in the Gulf of Finland off Seiskari. (en)
- World War II: The patrol craft was bombed and sunk in the Black Sea by Ilyushin Il-4 aircraft of the Soviet Naval Air Force. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Lockheed Hudson aircraft of 145 Squadron, Royal Canadian Air Force with the loss of all 48 crew. (en)
- World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean by a Douglas Digby aircraft of 10 Squadron, Royal Canadian Air Force with the loss of all 53 crew. (en)
- World War II: Convoy SL 125: The refrigerated cargo ship was torpedoed and sunk in the Atlantic Ocean off Madeira by with the loss of 14 of the 57 people on board. Survivors were rescued by . (en)
- World War II: The cargo ship struck a mine and sank off Port of Spain, Trinidad . (en)
- World War II: Battle of Cape Esperance: The was shelled and sunk off Cape Esperance, Guadalcanal by ships of Task Force 64, United States Navy, with the loss of 110 of her 219 crew. Survivors were rescued by , and . (en)
- World War II: The R 41-class R boats were sunk by mines in the North Sea off Dunkerque, Nord, France . (en)
- World War II: The cargo ship was torpedoed and sunk off Capri by . Two men were reported missing, 45 survivors were rescued, including 14 wounded. (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean east of the Belle Isle Strait by with the loss of all 35 crew. (en)
- The ship was wrecked on Lundy Island, Devon, United Kingdom with the loss of eight of her nine crew. (en)
- World War II: The cargo ship was torpedoed, shelled and sunk in the Atlantic Ocean east of Corocoro Island, Venezuela by with the loss of one of her 35 crew. Survivors were rescued by . (en)
- World War II: Convoy SC 104: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 32 of her 37 crew. Survivors were rescued by . (en)
- World War II: The coaster was torpedoed and shelled in the Adriatic Sea off Korcula, Yugoslavia by . She was beached at Sabioncello with four killed, ten wounded and 25 reported missing. The damaged ship was later salvaged but was declared a total loss. (en)
- The cargo ship was driven ashore near Cape English, Nova Scotia, Canada. She was a total loss. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: Convoy HX 212: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean by with the loss of three of her 59 crew. Survivors abandoned ship and were rescued by and . Gurney E. Newlin was torpedoed and sunk the next day by . (en)
- World War II: The was lost in the Baltic Sea. Possibly sunk in the Sodra-Kvarken Channel. The attacker was . (en)
- World War II: First Assault Convoy for Tassafaronga, Guadalcanal: The Sakito Maru-class auxiliary transport was bombed off Tassafaronga by a Douglas SBD Dauntless or a Consolidated PBY Catalina aircraft of the US "Cactus" Air Force from Guadalcanal. She was beached and burned out . 85 of her crew survived. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Djerba, Tunisia by with the loss of 44 of her 52 crew. (en)
- World War II: The tug was torpedoed and sunk in the Black Sea north east of Sulina by . (en)
- The cargo ship ran aground and was wrecked off Piauí. (en)
- World War II: The dredger was torpedoed and sunk at Safaga, Egypt by Luftwaffe aircraft. (en)
- World War II: The was bombed, torpedoed and damaged in the Indispensable Strait off Guadalcanal, Solomon Islands by Bell P-39 Airacobra, Boeing B-17 Flying Fortress and Douglas SBD Dauntless aircraft of the United States Army Air Force, United States Marine Corps and United States Navy. Her crew were rescued. She broke in two, with the bow section sinking; the stern section was scuttled by and at . (en)
- World War II: Convoy ONS 136: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 49 crew. (en)
- World War II: The Senkai Maru-class auxiliary stores ship was torpedoed and sunk in the Pacific Ocean off Kavieng, New Ireland, Papua New Guinea by . Three of her crew were killed. (en)
- World War II: The cargo ship was torpedoed and damaged in the Indian Ocean by . She was beached and declared a total loss. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean southwest of Iceland by a Lockheed Hudson aircraft of 269 Squadron, Royal Air Force with the loss of all 44 crew. (en)
- World War II: Convoy FN 32: The cargo ship was torpedoed and sunk in the North Sea off Cromer by . (en)
- World War II: The ore carrier was torpedoed and sunk in the Baltic Sea by . Four survivors were rescued by Shch-406 and sent to Leningrad but were never heard of again. A source gives a total of 14 men and a woman killed, but it may include the above survivors. (en)
- World War II: The auxiliary cruiser was torpedoed and sunk in the English Channel off La Hague, Manche, France by HMMTB 236 with the loss of all hands. (en)
- World War II: The cargo ship was torpedoed and sunk in Saltfjorden by with the loss of 17 of the 22 people on board. (en)
- World War II: The Type IXD2 submarine was depth charged and sunk in the South Atlantic off Cape Town by with the loss of all 61 crew. (en)
- World War II: The was sunk by a mine at Bornholm, Denmark. She was salvaged in July 1943 and towed to Sassnitz. (en)
- The armed trawler was lost following a collision with an unknown merchant vessel, resulting in her sinking in deep water south of Creag Island in the Lynn of Lorne, Scotland. (en)
- World War II: The tanker was sunk in the Port of Astrakhan by Luftwaffe aircraft. Three of her crew were killed. (en)
- World War II: Convoy HX 212: The cargo ship straggled behind the convoy due to rescuing survivors from the sinking of and . She was torpedoed and sunk in the Atlantic Ocean by with the loss of all 165 people on board. (en)
- World War II: Convoy SL 125: The cargo ship was torpedoed and damaged in the Atlantic Ocean by . She was torpedoed and sunk the next day by with the loss of two of the 90 people on board. Survivors were rescued by and . (en)
- World War II: The Landing Craft, Mecanized were reported lost on this day, cause unknown. (en)
- World War II: The cargo liner was sunk by a mine off Ålborg, Denmark. Her 47 crew, including five slightly wounded, were rescued. (en)
- World War II: Battle of Sukho Island: The Siebel ferry was shelled and damaged by Soviet shore batteries at Sukho Island in Lake Ladoga and ran aground, or was partially scuttled in shallow water. She was later shelled and sunk by (en)
- World War II: The transport ship was torpedoed and sunk in the South China Sea off Samarinda, Borneo, Netherlands East Indies by . (en)
- World War II: The Sinkyo Maru-class transport ship was sunk by torpedo in the Pacific Ocean off the coast of Japan by with the loss of 43 lives. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic south east of Cape Agulhas by with the loss of one of her 40 crew. Survivors were rescued by . (en)
- World War II: The cargo shi was torpedoed and sunk in the Pacific Ocean off the coast of Japan by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean off the mouth of the Orinoco River, Venezuela by with the loss of six of her 35 crew. Survivors were rescued by . (en)
- World War II: The cargo ship struck a mine and sank in the North Sea off the coast of Yorkshire. (en)
- World War II: The auxiliary sailing vessel was shelled and sunk in the Aegean Sea by . (en)
- World War II: The motor gun boat was sunk in the North Sea off Terschelling during an attack on a German convoy. One of her crew was killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic by with the loss of 15 of her 42 crew. Survivors were rescued by and . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south of Iceland by a Boeing B-17 Flying Fortress aircraft of 206 Squadron, Royal Air Force with the loss of all 44 crew. (en)
- World War II: Convoy TRIN 19: The coaster was torpedoed and sunk in the Caribbean Sea east north east of Trinidad by with the loss of nine of her 23 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was sunk at Tuapse by Luftwaffe aircraft. One crew was killed. (en)
- World War II: Convoy FN 32: The cargo ship was torpedoed and sunk in the North Sea off Cromer by Her 29 crew survived. (en)
- World War II: Convoy HX 212: The whale factory ship was torpedoed and sunk in the Atlantic Ocean by with the loss of 77 of the 154 people on board. Survivors were rescued by , and . A landing craft carried as deck cargo was also lost. (en)
- World War II: The troopship was torpedoed and sunk in the South Atlantic southwest of Cape Town, Union of South Africa by with the loss of 45 of the 1,067 people on board. Survivors were rescued by . (en)
- World War II: The tanker was torpedoed and sunk off Capo Figari by . There were Three dead and 29 survivors. (en)
- World War II: The auxiliary minesweeper, a former tug, was shelled and sunk off Stampalia, Greece by . There were no survivors from her 30-plus crew. (en)
- World War II: The Type B1 submarine was sunk by a mine east of Keppel Harbor, Singapore. 13 of her crew were killed; 96 crew and her commanding officer were rescued. (en)
- World War II: Convoy ON 139: The cargo ship was torpedoed and sunk in the Atlantic Ocean by with the loss of three of her 49 crew. Survivors were rescued by . (en)
- The No. 33-class armored motor gunboat was lost on this date. (en)
- World War II: The was sunk in a collision in the North Sea with a Kriegsmarine Schnellboot. (en)
- World War II: The was sunk at Genoa by Allied aircraft. (en)
- World War II: Battle of Cape Esperance: The sank in the Pacific Ocean north of Savo Island following battle damage inflicted by with the loss of 81 of her 276 crew. (en)
- World War II: The cargo ship struck a mine and sank off the coast of Norway . Her 47 crew were rescued. (en)
- World War II: The fishing trawler was torpedoed and sunk in the Atlantic Ocean by with the loss of all 13 crew. (en)
- World War II: Battle of Sukho Island: The Siebel ferry ran aground and was shelled and sunk in shallow water, only partially submerged, by Soviet shore batteries at Sukho Island in Lake Ladoga. Later salvaged and put into Soviet Navy service as DB-51. (en)
- World War II: The was bombed and sunk in the Bering Sea either northeast of Kiska Island in the Aleutian Islands, Territory of Alaska , or north of Pillar Rock off Kiska Island in an attack by six Martin B-26 Marauder aircraft of the Eleventh Air Force, United States Army Air Forces. Her commanding officer and 16 of her crew were rescued by ; the rest of her probable complement of 219 men were killed. (en)
- World War II: Convoy FN 32: The was torpedoed and sunk in the North Sea north east of Cromer, Norfolk by with the loss of three of her crew. (en)
- World War II: The ocean liner was torpedoed and sunk in the South Atlantic east north east of Ascension Island by with the loss of five of the 832 people on board. Survivors were rescued by . (en)
- World War II: The coastal tanker was torpedoed and damaged in the Black Sea by . She was consequently scuttled by Kriegsmarine R-boats. (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Cape of Good Hope, South Africa by . Her 64 crew were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south south west of the Cape of Good Hope, Union of South Africa by . Her 57 crew were rescued by . (en)
- World War II: Convoy FN 32: The cargo ship was torpedoed and sunk in the North Sea off Cromer by with the loss of 20 of her 29 crew. The wreck was subsequently dispersed. (en)
- World War II: Convoy ONS 136: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by with the loss of 57 of her 59 crew. Survivors were rescued by U-615 and made prisoners of war. (en)
- World War II: The lugger was sunk at Brüsterort, Germany by . (en)
- World War II: The prisoner transport ship was sunk off Lindesnes, Norway by a Handley Page Hampden aircraft of 489 Squadron, Royal New Zealand Air Force, with the loss of 986 of the 1,034 people on board. (en)
- World War II: The cargo ship was torpedoed and sunk off the coast of Japan (en)
- World War II: Convoy BS 31: The cargo ship was torpedoed and sunk in the Gulf of St Lawrence north of Cape Breton Island, Nova Scotia, Canada by . Her 27 crew were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean south east of Trinidad by with the loss of one of her 36 crew. (en)
- World War II: The unescorted passenger ship was torpedoed and sunk in the Atlantic Ocean northwest of the Azores, Portugal by with the loss of 362 of the 393 people on board. She was on a voyage from Cape Town, Union of South Africa to Liverpool, Lancashire. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the South Atlantic] south south west of Cape Town by with the loss of ten of her 49 crew. Survivors were rescued by . (en)
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