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- 3974400.0 (dbd:second)
- World War II: The gunboat was rammed and sunk by a Royal Navy destroyer. (en)
- World War II: Convoy SO-903: The was damaged off Three Island Harbour, New Hanover Island by North American B-25 Mitchell aircraft of the 500th Bomb Squadron and run aground on a reef. She was later bombed and destroyed by aircraft of the 345th Bomb Group, United States Fifth Air Force. 14 crewmen were killed. (en)
- World War II: The was burned out and sunk while tied up alongside when she was sunk by a glide bomb off Anzio. Survivors rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk off the coast of Norway by . The whole crew of the Rheinhausen were rescued by NS-22 . (en)
- World War II: The Type 1B Wartime Standard cargo ship was torpedoed and sunk in the South China Sea south south west of Takao by . 1,533 troops, 15 gunners and 21 crewmen were killed. (en)
- World War II: The Liberty ship was sunk by a Luftwaffe glider bomb in the Mediterranean Sea off Anzio, Lazio, Italy . Seven stevadores, two gunners and three crewmen were killed. Survivors were rescued by . (en)
- World War II: The cargo ship struck a mine and sank off Genoa, Italy. (en)
- World War II: The Type B1 submarine was torpedoed and sunk in the Pacific Ocean east south east of Guam by . Lost with all 166 hands. (en)
- World War II: Convoy O-902: The cargo ship was bombed and sunk in the Gazalle Channel south of Kavieng by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group and Douglas A-20 Havoc aircraft of the 23rd Bomb Group, United States Fifth Air Force. Fifteen crewmen were lost. (en)
- World War II: The cargo ship was bombed, torpedoed and sunk in Koravia Bay, New Britain by United States Navy Grumman TBF Avenger and Douglas SBD Dauntless aircraft. There were no casualties. (en)
- The landing craft tank was lost in the Mediterranean Sea. (en)
- The gunboat, a converted MFP-C landing craft, was sunk by Allied fighter-bomber aircraft in Livorno, Italy. All crew survived, one being wounded. (en)
- World War II: The Type R-151 minesweeper was sunk by Allied aircraft at Porto Ercole. (en)
- World War II, Japanese Indian Ocean Raid: The cargo ship was shelled and sunk in the Indian Ocean by the cruiser (en)
- World War II: Operation Hailstorm: The was torpedoed and damaged off Truk by United States Navy aircraft. She sank the next day with the loss of 29 of her 154 crew. Survivors were rescued by and . (en)
- World War II: The transport ship , attempting to avoid an attack by a submarine, ran aground in a storm on the Gaideronos Reef, Rhodes, Greece and broke in two. Only 60 of the approximately 4,300 people on board were rescued. (en)
- World War II: The MOB-FD-class naval trawler/submarine chaser was bombed and sunk in the North Sea west of Stadlandet, Norway by British aircraft. (en)
- World War II: The passenger ship was sunk at Hustadvika, off Kristiansund by and . (en)
- The capsized and sank in the North Sea. She was being towed from Harwich, Essex to Hull, Yorkshire. (en)
- World War II: The Krischan der Grosse-class anti-aircraft ship was sunk by Allied bomber aircraft off Antwerp. (en)
- World War II: The was sunk by a German glide bomb off Anzio, Lazio, Italy. 35 crew were killed. (en)
- The landing craft tank foundered off Anzio, Lazio, Italy in a storm. (en)
- World War II: The was depth charged and sunk in the Black Sea west of Sevastopol by with the loss of all 47 crew. (en)
- World War II: The Type R-130 minesweeper was sunk by British aircraft off Den Helder, North Holland, Netherlands. Two crew members died in the attack and 14 were injured. (en)
- World War II: The Type B midget submarine was sunk off Three Island Harbor, New Hanover Island by North American B-25 Mitchell aircraft of the 500th Bomb Squadron. One crewman killed, one rescued by . (en)
- The 7-gross register ton, scow was destroyed by fire in Lynn Canal in Southeast Alaska. (en)
- World War II: Convoy SO-903: The Sanko Maru-class auxiliary collier/oiler was sunk off Three Island Harbour by North American B-25 Mitchell aircraft of the 500th Bomb Squadron, of the 345th Bomb Group, United States Fifth Air Force. Fourteen crewmen were killed. (en)
- World War II: The Liberty ship was bombed and sunk in the Mediterranean Sea off Anzio, Lazio, Italy by German aircraft. (en)
- World War II: Operation Hailstorm: The was shelled and sunk in the Pacific Ocean north west of Truk by . (en)
- The VAS 201-class submarine chaser was wrecked off Capri. (en)
- World War II: Operation Hailstorm: The Kiyosumi Maru-class auxiliary cruiser was bombed, torpedoed, and sunk in the Pacific Ocean off Fefan Island, Truk by United States Navy aircraft. 43 crewmen were killed. (en)
- World War II: The submarine was torpedoed and sunk in the Strait of Malacca by with the loss of 31 of her crew . There were 14 survivors. (en)
- World War II: The transport was shelled and sunk by , , and in the Isabel Channel, New Hanover Island, New Ireland, New Guinea. Three crew were killed. (en)
- World War II: The auxiliary minelayer was sunk by British aircraft. (en)
- World War II: The PP-19-OK-class motor anti-submarine boat was sunk by a mine during a landing operation at Meriküla, Estonia. 15 crew were killed. (en)
- World War II: The cargo ship was bombed and sunk at Selbervik, Norway by British aircraft. (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off Wewak, New Guinea by Douglas A-20 Havoc, North American B-25 Mitchell and Curtiss P-40 Warhawk aircraft of the United States Fifth Air Force. (en)
- World War II: The British WWI C-class standard cargo ship/transport was damaged in the South China Sea off Wenchow, China by North American B-25 Mitchell aircraft of the Chinese Air Force and later in the day sunk by with the loss of four crew. Survivors were rescued by and . (en)
- World War II: The Kyosei Maru-class auxiliary netlayer was shelled and sunk by , , and in the Isabel Channel, New Hanover Island, New Ireland, New Guinea. Five crew were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Indian Ocean by . All 37 crew were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by with the loss of 33 of her 49 crew. (en)
- World War II: The landing craft vehicle and personnel was lost in the vicinity of Richborough, Kent, England, during an exercise. (en)
- World War II: Operation Hailstorm: The T-51-class motor torpedo boat was sunk by US Navy aircraft . (en)
- World War II: Operation Hailstone: The was torpedoed and sunk in the Pacific Ocean off Truk by a United States Navy Grumman TBF Avenger aircraft with the loss of 172 of her 192 crew and all 523 survivors from . (en)
- World War II: Convoy O-902: The was bombed and sunk in the Bismark Sea south of Kavieng, New Ireland by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group and Douglas A-20 Havoc aircraft of the 23rd Bomb Group, United States Fifth Air Force. (en)
- World War II: Convoy Wewak No. 8: The British WWI C-class standard cargo ship was torpedoed and sunk in the Pacific Ocean off New Guinea by . 62 troops and 6 crew were killed. (en)
- World War II: Convoy MOTA-05 or MATA-03: The Gyoko Maru-class cargo ship caught fire in her hold and was destroyed by an explosion in Naha harbor . Unclear if fire was accidental or possibly a dud torpedo hit by that went unnoticed. The ship was gutted by fire and sank. Six crew were killed. (en)
- The coaster ran aground at Masfjordnes, Hordaland in a storm. She capsized and sank with the loss of eleven lives. (en)
- World War II: The Type VIIC submarine was sunk in the Atlantic Ocean southwest of Ireland by , and with the loss of all 50 crew. (en)
- The K-15/M-17-class river minesweeping launch was sunk on this date. (en)
- World War II: Convoy GUS 31: The Liberty ship was torpedoed and damaged in the Mediterranean Sea off Bône, Algeria by with the loss of one of her 69 crew. Survivors were rescued by . George Cleeve was beached at Bône but was subsequently declared a constructive total loss. (en)
- World War II: The guard boat was bombed, torpedoed and sunk in Koravia Bay, New Britain by United States Navy Grumman TBF Avenger and Douglas SBD Dauntless aircraft. (en)
- World War II: The cargo ship was sunk at Hustadvika, off Kristiansund by and . (en)
- World War II: The transport ship was torpedoed and sunk in the Strait of Malacca off Penang, Malaya by . (en)
- thumb|right|Aikoku Maru explodesWorld War II: Operation Hailstorm: The Hokuku Maru-class armed merchant cruiser was bombed and damaged, later in the day she exploded and sank in Truk Lagoon, South Pacific Mandate after being torpedoed by a Grumman TBF Avenger aircraft that went down from the blast. Most of the ships' crew including Captain Nakamaruo and 945 sailors, passengers and men of the First Brigade were killed. In July 1980 remains of 400 of those killed were returned to Japan. (en)
- World War II: Convoy O-902: The was bombed and sunk in the Bismark Sea south of Kavieng by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group and Douglas A-20 Havoc aircraft of the 23rd Bomb Group, United States Fifth Air Force. (en)
- World War II: The supply ship was scuttled in the Indian Ocean to avoid capture by . The crew were rescued by . (en)
- The War Shipping Administration troop transport bound for Milne Bay grounded on Uluma Reef about off the coast of New Guinea and was a constructive total loss after removal of all personnel and part of the cargo. (en)
- The Vorpostenboot collided with and sank in the Baltic Sea. (en)
- World War II: The prisoner transport was torpedoed and sunk in Suda Bay by with the loss of 2,647 of the 3,338 people on board. (en)
- The Vorpostenboot collided with and sank in the North Sea off Hook of Holland, South Holland, Netherlands with the loss of four lives. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by with the loss of twelve of her 57 crew. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Arctic Ocean by a Consolidated PBY Catalina aircraft of 210 Squadron, Royal Air Force with the loss of all 51 crew. (en)
- World War II: The auxiliary oiler was torpedoed and sunk south of Davao, Mindanao by . Her commanding officer and 37 crewmen were killed. (en)
- World War II: The auxiliary sailing vessel was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: The Tategami-class salvage/repair tug was shelled and sunk in the Pacific Ocean northwest of Kavieng by , , , and . About one hundred and fifty crewmen and survivors of the previous days air attacks that sank CHa-48, Kokai Maru and Kowa Maru survived the sinking. About half were rescued and made prisoners of war, the rest refused to be rescued and were lost. (en)
- World War II: The Type VIIC submarine was detected transiting the Strait of Gibraltar by a Consolidated PBY Catalina aircraft of the United States Navy that was equipped with Magnetic Anomaly Detector gear. The Catalina, along with a Royal Air Force Catalina and a Lockheed PV-1 Ventura, bombed and damaged the U-boat. When intercepted in the Atlantic Ocean off Tangier, Morocco by and she was scuttled by her crew. Nine of her 57 crew were lost. She was the first submarine sunk through use of MAD gear. (en)
- World War II: Operation Hailstorm: Convoy No. 3206: The cargo ship was bombed and sunk in the Pacific Ocean north west of Truk by United States Navy Douglas SBD Dauntless dive bomber aircraft from . and rescued an unknown number of survivors. (en)
- The landing craft personnel (rocket) was lost in a collision in British waters. (en)
- World War II: The Higgins 78'-class PT boat was sunk in Empress Augusta Bay, Bouganville by Japanese shore batteries after running aground whilst pursuing Japanese barges. (en)
- The cargo ship ran aground off Cape Otranto, Greece. She was a total loss. (en)
- World War II: The cargo ship was sunk in the Bay of Naples off Capri, Italy by Allied aircraft with the loss of six of her 48 crew. (en)
- World War II: Operation Shingle: The landing ship tank was torpedoed and sunk in the Mediterranean Sea south of Naples, Campania, Italy by . There were 24 dead and 79 survivors. (en)
- thumb|A U.S. Navy Grumman F6F Hellcat aircraft passes over the sinking Tachikaze.World War II: Operation Hailstorm: The was torpedoed and sunk in the Pacific Ocean off Kuop, Truk by United States Navy aircraft with the loss of 67 crewmen. (en)
- World War II: The Kaichū type submarine was depth charged and sunk in the Pacific Ocean off Wotje by with the loss of all 70 hands. (en)
- World War II: The sailing ship was rammed and sunk in the Mediterranean Sea off Soueida by . All crew survived. (en)
- World War II: The was depth charged and sunk in the Bay of Bengal by , , and with a loss of all 47 crewmen. (en)
- The Higgins 78'-class PT boat was sunk off Bouganville Solomon Islands in a collision with her sister boat . (en)
- The landing craft vehicle was lost while in service with the Royal Army Service Corps at Rothesay, Scotland. (en)
- World War II: The cargo ship was bombed and sunk at Chios, Greece by British aircraft. (en)
- World War II: The cargo ship was sunk in the South China Sea by United States Navy carrier-based aircraft. (en)
- World War II: The cargo ship was bombed and sunk at Rabaul, New Guinea by Douglas SBD Dauntless and Grumman TBM Avenger aircraft of the United States Navy. (en)
- World War II: The auxiliary minelayer was torpedoed and sunk off Toulouse, Var, France by with the loss of twelve of her crew. (en)
- World War II: The Type R-151 minesweeper was damaged by Allied aircraft at Rogoznica, Yugoslavia. She was taken to Pola for repairs but sank there. She was later raised. (en)
- World War II: Operation Shingle: The Fort ship was torpedoed and sunk in the Mediterranean Sea east of Capri, Campania, Italy by . All 67 people on board were rescued by a Royal Air Force rescue boat. (en)
- World War II: Convoy MOTA-01: The Type 1C Standard cargo ship/transport was torpedoed and damaged in the Bashi Channel south of Formosa by and was run aground to prevent sinking. After emergency repairs she was refloated the next day and then was repaired at Takao before the end of the month. (en)
- World War II: The cargo ship was bombed and sunk in the Aegean Sea off Amorgos, Greece by British aircraft. (en)
- The collier came ashore at Tynemouth, Northumberland in a gale. She broke in two, a total loss. (en)
- World War II: Convoy KR 8: The passenger ship was torpedoed and sunk in the Indian Ocean south west of the One and a Half Degree Channel by with the loss of 1,297 of the 1,511 people on board. Survivors were rescued by . (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by and . All 52 crew survived. (en)
- World War II: The auxiliary submarine chaser was sunk by a mine near Kavieng, New Ireland. (en)
- World War II: Continuation War: The Sisu-class motor torpedo boat was sunk at Helsinki by Soviet aircraft. (en)
- World War II: The sailing ship was shelled and sunk in the Mediterranean Sea off Beirut, Lebanon by . All crew survived. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by . 43 crew were killed. (en)
- World War II: Matsu Maru Transportation Convoy: The was depth charged and sunk in the East China Sea by with the loss of all 81 crew. (en)
- World War II: The cargo ship was torpedoed and sunk off Kushimoto, Japan by . 32 crew were killed. (en)
- World War II: Convoy MAMI-02: The transport was torpedoed and sunk in the South China Sea by . One hundred and ninety-two troops and seven crewmen were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Tsushima Strait by . (en)
- World War II: The salvage vessel was torpedoed and sunk in the Laccadive Sea south west of Ceylon by with the loss of 27 of her 55 crew. (en)
- The Higgins 78'-class PT boat was sunk off Newport, Rhode Island in a collision with an unknown object. (en)
- World War II: The Konsan Maru-class tanker was torpedoed and sunk in the East China Sea off Okinoerabu Island, west of Amami-o-Shima, by . Two gunners and seventeen crewmen were killed. (en)
- World War II: The minesweeper collided with another vessel and sank in the North Sea off the coast of Suffolk, United Kingdom whilst engaged in a battle with , , , and . (en)
- The schooner was sighted in the Irish Sea off Dublin. No further trace. (en)
- World War II: The anti-aircraft corvette was bombed and sunk at Toulon, Var by Allied aircraft. (en)
- World War II: Convoy PA 69: The tanker was torpedoed and damaged in the Gulf of Aden by . She was beached off Aden. The vessel was later taken under tow to Massawa, Eritrea but broke in two during the journey. Both parts reached port and were later taken to Italy and laid up. Repaired postwar and re-entered service in 1947 as Bramora. (en)
- World War II: The cargo ship was wrecked after running aground near Incheon, Korea. There were no casualties. (en)
- World War II: Convoy H-17: The Chojo Maru-class transport was torpedoed and sunk in the Philippine Sea by . A total of 748 troops and sailors, seventeen gunners, three guards, fifteen lookouts and 72 crewmen were killed. (en)
- The landing craft personnel (large) was lost on this date. (en)
- World War II: Operation Hailstorm: The Soya-class ammunition ship ran aground on a large coral head east of Dublon Island, Truk while fleeing air attacks. The vessel was lightly damaged by bombing and strafing while aground during the attacks. Ten crewmen were killed. Soya was refloated at an unknown date. (en)
- World War II: The Shinto Maru No. 2-class auxiliary transport ship was bombed and damaged in the Pacific Ocean off New Hanover Island and was beached, or was bombed and sunk at Kavieng, New Ireland near Three Island, by North American B-25 Mitchell aircraft of the United States Army Air Force. One crewman was killed. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by and with the loss of nineteen of her 49 crew. (en)
- World War II: The dredge was bombed and sunk in the South China Seoff Tourane by North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. (en)
- The foundered in a storm off Anzio. (en)
- The ran aground and sank off Naples, Italy. (en)
- The was wrecked off Isola di Ponza, Italy . (en)
- The MFP-A landing craft was sunk on this date. (en)
- The MFP-C landing craft was sunk on this date. (en)
- The Vorpostenboot was lost. (en)
- The auxiliary guard boat was lost on this date. (en)
- The cargo ship was wrecked off Kirkenes, Norway. (en)
- The guard ship was sunk. (en)
- The landing craft mechanized was lost. (en)
- World War II: Convoy O-003: The Kowa Maru-class auxiliary transport was bombed and sunk north of New Hanover by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group, United States Fifth Air Force. 22 crewmen were killed. Unknown number of survivors rescued by . (en)
- World War II: The cargo ship was bombed and sunk at Split, Yugoslavia in an Allied air raid. (en)
- World War II: Convoy PA 69: The tanker was torpedoed and sunk in the Gulf of Aden by with the loss of one of her 53 crew. Survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Strait of Malacca by . (en)
- World War II: Convoy PA 69: The tanker was torpedoed and sunk in the Gulf of Aden by with the loss of six of her 70 crew. Survivors were rescued by and . (en)
- World War II: The gunboat struck a mine and sank in the Pacific Ocean off Cape St. Jacques, French Indochina. (en)
- World War II: The Type IXC/40 submarine struck a mine and sank in the Baltic Sea north of Swinemünde, Pomerania with the loss of 51 of her 58 crew. (en)
- World War II: The sailing ship was rammed and sunk in the Mediterranean Sea north east of Soueida, Syria by . There were no casualties. (en)
- World War II: Operation Hailstorm: The was bombed, torpedoed and sunk west of Truk in the Pacific Ocean by United States Navy aircraft. Two hundred and forty crewmen were lost; there were 210 survivors. (en)
- World War II: The was torpedoed and sunk in the Pacific Ocean off Truk, South Seas Mandate by with the loss of 50 of her 265 crew. (en)
- The No. 11-class landing tender was lost on this date. (en)
- World War II: The auxiliary submarine chaser was sunk west of Leros, Greece by North American B-25G Mitchell aircraft of the United States' 379th Bombardment Squadron, 310th Bombardment Group. Three crew were killed. 18 survivors were rescued by UJ 2151 and UJ 2153 . (en)
- World War II: The Mikage Maru No. 20-class auxiliary transport ship was torpedoed and sunk in the Pacific Ocean north west of Manokawarki, New Guinea by . 34 killed. Survivors were rescued by . (en)
- World War II: The W-19-class minesweeper was bombed, torpedoed and sunk in Koravia Bay, New Britain by United States Navy aircraft. Scrapped in situ in 1958. (en)
- World War II: Convoy HI-40: The IJA-chartered Wartime Standard Type 1TM tanker was torpedoed and sunk in the South China Sea west of Luzon by . Six crewmen were killed. (en)
- World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Cape Cépet, Var, France by . (en)
- World War II: Convoy EN 342: The cargo ship foundered in the Atlantic Ocean off Cape Wrath, Sutherland, United Kingdom after her cargo of rye shifted. Twenty of her 22 crew were lost. (en)
- World War II: Convoy UR 108: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Norwegian Sea south east of Iceland by with the loss of all 30 crew. (en)
- World War II: The cargo ship was damaged in an Allied air raid on Livorno, Italy and was beached. The ship was eventually scuttled as a blockship at Livorno, Italy in July 1944. (en)
- World War II: The midget submarine collided with and sank in the Pentland Firth with the loss of all four crew. (en)
- World War II: Convoy O-003: The auxiliary submarine chaser was bombed and sunk north of New Hanover Island by North American B-25 Mitchell aircraft of the United States Fifth Air Force. Unknown number of survivors rescued by . (en)
- World War II: The cargo ship was bombed and sunk in the South China Sea off Swatow, China by Consolidated B-24 Liberator and North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by , and with the loss of 36 of her 52 crew. (en)
- World War II: The tanker was bombed and sunk in Seyðisfjörður by Focke-Wulf Fw 200 aircraft of I Staffeln, Kampfgeschwader 40, Luftwaffe. (en)
- World War II: Operation Hailstorm: The was shelled and sunk in the Pacific Ocean west of Truk by . Six crew survived and were taken as prisoners of war. (en)
- World War II: Convoy CU 15: The cargo ship collided in the Atlantic Ocean with . Both ships caught fire. El Coston was then rammed by . All 117 crew from both ships were rescued by USS Marchand and . Murfreesboro sank that day, El Coston sank the next day. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean west of Kyushu by . (en)
- World War II: Convoy GUS 31: The Liberty ship was torpedoed and damaged in the Mediterranean Sea off Bône, Algeria by . All 77 crew survived. Peter Skene Ogden was taken in tow by and beached at Herbillon but was subsequently declared a constructive total loss. (en)
- World War II: The naval trawler was sunk in the North Sea by a Kriegsmarine Schnellboot with all 24 hands. (en)
- World War II: The cargo ship was torpedoed and sunk in the Ionian Sea off Pylos by British aircraft. (en)
- World War II: The Shoei Maru-class auxiliary transport was torpedoed, blew up and sank in the Pacific Ocean south west of Tinian by . Forty-seven crewmen were killed. (en)
- The non self-propelled covered lighter ran aground and sank off Portsmouth, New Hampshire. (en)
- World War II: The was depth charged and sunk in the East China Sea by Japanese aircraft with the loss of all 60 crew. (en)
- The cargo ship collided with , , and off Casablanca, Morocco and was severely damaged. She was declared a constructive total loss. Subsequently scuttled in June on the Normandy coast as part of Operation Overlord. (en)
- World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by a Vickers Wellington aircraft of 407 Squadron, Royal Canadian Air Force with the loss of all 49 crew. (en)
- World War II: Convoy FS 1371: The cargo ship was torpedoed and sunk in the North Sea off the coast of Norfolk by a Kriegsmarine Schnellboot with a loss of seven of her 25 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Java Sea by . An unknown number of troops & POWs, 3000 coolies, and 34 crew are killed. (en)
- World War II: The auxiliary gunboat was bombed and sunk in the South China Sea off Swatow by Consolidated B-24 Liberator and North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. (en)
- World War II: Convoy O-902: The cargo ship was bombed and sunk in the Gazalle Channel south of Kavieng by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group and Douglas A-20 Havoc aircraft of the 23rd Bomb Group, United States Fifth Air Force. Nineteen crewmen, 41 troops and 46 gunners were lost. (en)
- World War II: The cargo ship was torpedoed and sunk west north west of Namsos, Norway by . (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off New Hanover Island, New Guinea by Consolidated B-24 Liberator aircraft of the United States Navy and North American B-25 Mitchell aircraft of the United States Fifth Air Force. (en)
- World War II: The Type R-151 minesweeper was sunk by Allied aircraft off Corfu, Greece. (en)
- World War II: The auxiliary gunboat was sunk at Rabaul, New Guinea by . (en)
- World War II: Battle of Ist: The cargo ship was shelled and sunk in the Adriatic Sea by . (en)
- World War II: The Aratama Maru-class auxiliary repair ship was torpedoed and sunk in the Pacific Ocean by . The commanding officer and three crewmen were killed. (en)
- World War II: The Vorpostenboot was sunk in a naval battle. (en)
- World War II: The auxiliary submarine chaser was shelled and sunk in the Pacific Ocean by , , , and . (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Truk, South Pacific Mandate by . 554 troops of the IJA's 66th Infantry Regiment and 23 crewmen were killed. (en)
- World War II: Operation Hailstorm: The Kensho Maru-class auxiliary transport was bombed, torpedoed, and sunk at Truk by United States Navy aircraft. Six crewmen were killed. (en)
- World War II: Convoy No. 4220: The Kimishima Maru-class auxiliary transport was torpedoed and sunk in the Pacific Ocean north east of Torishima, Izu Islands by . Ten troops and Four crewmen were killed. (en)
- The landing craft, infantry (small) was wrecked at Portslade, Sussex. (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off Wewak by Douglas A-20 Havoc, North American B-25 Mitchell and Curtiss P-40 Warhawk aircraft of the United States Fifth Air Force. (en)
- World War II: Convoy O-902: The cargo ship was bombed and sunk in the Gazalle Channel by Douglas A-20 Havoc, North American B-25 Mitchell and Lockheed P-38 Lightning aircraft of the United States Army Air Force. (en)
- World War II: The W-class destroyer was torpedoed and sunk in the Bristol Channel off Trevose Head, Cornwall by with the loss of 67 of her 160 crew. Survivors were rescued by and . (en)
- World War II: The cargo ship was torpedoed and sunk in the Laccadive Sea south west of Ceylon by with the loss of four of her 42 crew. Two crew were taken on board U-168 as prisoner of war. The rest of the survivors were rescued by and . (en)
- World War II: The cargo ship was bombed and sunk in the Pacific Ocean off Aitape, New Guinea by Douglas A-20 Havoc aircraft of the United States Fifth Air Force. (en)
- World War II: Operation Hailstorm: The Type 1B Standard Wartime cargo ship was bombed and sunk at Truk by United States Navy aircraft from Task Force 58. (en)
- World War II: Operation Hailstorm: The auxiliary transport was bombed and sunk off Eten Island, Truk by United States Navy carrier aircraft. 23 crewmen were killed. (en)
- The Toyo Maru-class transport ran aground in dense fog and was wrecked in the Kumanonada Sea southwest of Daiosaki Lighthouse . Declared a constructive total loss. (en)
- The cargo ship was sunk in a collision south of Rautingen, Norway. (en)
- World War II: The minesweeper was damaged in a battle with , , and and was beached at Aber Wrac'h, Finistère, France. She was then destroyed the next day by Hawker Typhoon aircraft of 266 Squadron, Royal Air Force. Seven crew were killed. (en)
- World War II: Operation Hailstorm: Convoy No. 3206: The Shiraha Maru-class auxiliary transport was bombed and sunk in the Pacific Ocean northwest of Truk by United States Navy Douglas SBD Dauntless dive bomber aircraft from . Her bridge was blown off killing her bridge crew and many senior Imperial Japanese Army officers. She sank at . 535 troops and crew were killed. , , , and , rescued 800, but 500 went missing. (en)
- World War II: The cargo ship was torpedoed and sunk off Kushimoto, Japan by . 15 crew were killed. (en)
- World War II: The was bombed and sunk at Toulon by Allied aircraft. (en)
- World War II: Convoy A: The transport was torpedoed and sunk near Halmahera, Maluku Islands by . 258 Formosa Giyu Corps troops, six crewmen and one gunner died. (en)
- World War II: Operation Hailstorm: The Akagi Maru-class armed merchant cruiser was bombed and damaged at Truk by United States Navy aircraft and was consequently scuttled. A total of 512 passengers and 788 sailors were killed. (en)
- World War II: The tanker was torpedoed and damaged east of Saint-Tropez, Var, France by . Cesteriano was towed in to Toulon, Var. (en)
- World War II: Convoy No. 7125: The Nichiro Maru-class auxiliary transport was torpedoed, exploded and sank in the Pacific Ocean north of Palau by . Her captain and 49 crewmen were killed. Survivors were rescued the next day by . (en)
- World War II: Operation Hailstorm: The Nippo Maru-class auxiliary water tanker was bombed and damaged in the Natshushima anchorage , Truk by United States Navy aircraft from Task Force 58, sinking the next day. (en)
- World War II: The cargo ship was bombed and sunk in the South China Sea off Swatow by Consolidated B-24 Liberator and North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. (en)
- World War II: The coaster was bombed and sunk at Hammerfest. She was refloated in March 1944, repaired, and returned to service in April 1947. (en)
- World War II: Operation Shingle: The landing ship tank was torpedoed and sunk in the Mediterranean Sea north west of Ponza Island, Italy by with the loss of 21 lives. Survivors were rescued by . (en)
- The naval trawler/submarine chaser was lost on this date. (en)
- The auxiliary submarine chaser was lost on this date. (en)
- World War II: Operation Shingle: The tug struck a mine off Anzio, Lazio, Italy and sank. (en)
- World War II: The merchant ship was sunk at Crete by British aircraft. (en)
- World War II: The submarine tender was badly damaged in a collision off Campbeltown Argyllshire with , was beached but then sank later the same day while being re-floated to be taken for repair. There were no casualties. (en)
- World War II: Convoy H-17: The Odatsuki Maru-class transport was torpedoed and sunk in the Flores Sea by . Four guards and six crewmen were killed. Survivors were rescued by . (en)
- World War II: Convoy HI-40: The IJA-chartered Standard Type 1TM tanker was torpedoed and sunk in the South China Sea west of Luzon by . Five gunners and 55 crewmen were killed. (en)
- World War II: Convoy No. 3206: The auxiliary transport ship was torpedoed, broke in two and sank in the Pacific Ocean west of Truk by . An unknown number of troops and eight crewmen were killed. rescued many survivors, but had to discontinue due to becoming unstable from the large numbers rescued. 1,000 survivors were rescued by other ships of the convoy. (en)
- World War II: The cargo ship was torpedoed and sunk in the Aegean Sea north of Iraklion, Greece by British aircraft. (en)
- World War II: Operation Hailstorm: Convoy No. 4215: The auxiliary submarine chaser/naval trawler was shelled and sunk in the Pacific Ocean north west of Truk by . (en)
- World War II: The Type B submarine was depth charged and sunk in the Pacific Ocean off the Marshall Islands by and with the loss of all 100 crew. (en)
- World War II: The transport boat was sunk in a gun battle with the patrol boats PC-2 Makola and PC-3 Skampo . (en)
- World War II: The Kaiko Maru-class transport was torpedoed and sunk in Noda Anchorage, Paramushiro by . Her commanding officer and two crewmen were killed. (en)
- World War II: The Liberty ship was torpedoed and sunk in the Gulf of Aden by with the loss of twenty of her 71 crew. Survivors were rescued by a British merchant ship. (en)
- World War II: The cargo ship struck a mine and sank in the Irben Strait. (en)
- World War II: The Type VIIC submarine went missing on patrol in the Atlantic Ocean with the loss of all 51 crew. Cause believed to be aircraft from whilst the submarine was west of Ireland attacking the homeward bound Convoy ON 223. (en)
- World War II: The Type A1 submarine was sunk in the Pacific Ocean by . (en)
- World War II: The coaster struck a mine and sank in the Irben Strait. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: The was depth charged and sunk in the Pacific Ocean north west of Kwajalein Atoll by , and . Lost with all 69 hands. (en)
- World War II: The cargo ship struck a mine and sank in the East China Sea off the mouth of the Yangtze . (en)
- World War II: The submarine chaser, a former , was sunk by Allied aircraft at Breda, Girona, Italy. (en)
- World War II: Operation Hailstorm: Several barges loaded with men are bombed and sunk by Grumman TBF Avenger aircraft from . (en)
- World War II: Operation Hailstorm: The Hoyo Maru-class oiler was bombed, capsized and sank in shallow water with part of the hull above water east of Fenfar Island, Truk by United States Navy aircraft. Six crewmen were killed. (en)
- World War II: The cargo ship was torpedoed and sunk by Allied aircraft west of Navarino, Greece. (en)
- World War II: The Type VIIC submarine was sunk in the Atlantic Ocean southwest of Ireland by and with the loss of all 49 crew. (en)
- World War II: Convoy No. 4220: The Koyo Maru-class auxiliary transport was torpedoed and sunk in the Pacific Ocean north north west of Chichijima, Bonin Islands by . A total of 1,046 troops and 34 crewmen were killed. rescued 142 survivors. (en)
- World War II: The tanker was torpedoed, shelled and sunk in the Indian Ocean by . Survivors were machine gunned killing nineteen, the rest of the survivors were rescued by . (en)
- World War II: The cargo ship was torpedoed and sunk off Stavanger, Norway by . (en)
- World War II: Convoy MO-72: The repair ship was torpedoed and sunk in the Mindoro Strait by . Four passengers and four of the crew, or eight crew, were killed. (en)
- World War II: Battle of Ist: The submarine chaser, a former , was sunk by and in the Adriatic Sea. (en)
- World War II: The cargo ship was bombed and sunk off the mouth of the Sepik, New Guinea by Consolidated B-24 Liberator aircraft of the United States Navy. (en)
- World War II: The Type R-218 minesweeper was sunk by a mine off the Schlei Estuary. (en)
- World War II: The cargo ship was torpedoed and sunk in the Laccadive Sea south of Ceylon by with the loss of seven of her 53 crew. Survivors were rescued by and . Palma was on a voyage from Liverpool, Lancashire to Calcutta, India. (en)
- The foundered in a storm off Sicily, Italy, or off the coast of Algeria . (en)
- World War II: The cargo ship was bombed and sunk in the South China Sea off Hainan, China by North American B-25 Mitchell aircraft of the United States Fifth Air Force. (en)
- World War II: Operation Hailstorm: The anchored Shinko Maru-class auxiliary transport ship was bombed and sunk north of Fefan Island, Truk by United States Navy aircraft from Task Force 58. 11 crewmen were killed. (en)
- The ran aground off Newfoundland. She was subsequently used as a hulk. (en)
- World War II: The Manko Maru-class auxiliary storeship was torpedoed and sunk in the Pacific Ocean about west north west of Saipan by . Eight crew were killed. (en)
- World War II: The Fairmile B motor launch was mined and sunk off the Somme estuary. Five crewmen were killed. (en)
- World War II: The survey ship was bombed and sunk at Tourane, French Indochina by North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. Three crewmen were killed. (en)
- World War II: The Liberty ship was torpedoed and damaged in the Mediterranean Sea off Ténès, Algeria by Luftwaffe aircraft. She was taken in tow but later sank. One crew was killed. There were 90 survivors. (en)
- World War II: The was depth charged and sunk in the Pacific Ocean off Green Island, New Guinea by and with the loss of all 91 crew. (en)
- World War II: The auxiliary submarine chaser was bombed and sunk off Kavieng by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group and Douglas A-20 Havoc aircraft of the 23rd Bomb Group, United States Fifth Air Force. (en)
- World War II: The troopship was bombed and sunk at Hammerfest, Finnmark. She was raised in 1947 and scrapped in 1951. (en)
- World War II: The Taisoku Maru-class auxiliary transport was torpedoed and sunk in the Pacific Ocean west of Halmahera, Malaku Islands by . 35 passengers and 42 crew were killed. (en)
- World War II: The Echizen Maru-class cargo ship was torpedoed and sunk in the Pacific Ocean west of Saipan by . 35 crew were killed. (en)
- World War II: Convoy SO-805: The Toei Maru-class transport was torpedoed and sunk in the Pacific Ocean off Palau by . Fifty-six crewmen were killed. (en)
- World War II: The sailing vessel was sunk at Zante, Greece by British aircraft. She was later refloated and returned to service. (en)
- World War II: Convoy HI-40: The standard merchant Type 1 TL oiler was torpedoed and sunk in the Pacific Ocean east of Formosa by . 37 crewmen, 12 gunners and two passengers were killed. (en)
- World War II: The sailing vessel was sunk in the Mediterranean Sea off Hyères, Var by . (en)
- World War II: Convoy STL 12: The cargo ship was torpedoed and sunk in the Gulf of Guinea by with the loss of seven of her 67 crew. Survivors were rescued by . (en)
- World War II: Convoy Mo-Ta-06: The Toyooka Maru-class auxiliary troopship was torpedoed and sunk in the East China Sea south west of Kagashima by with the loss of 2,765 troops, four workers, nine gunners and 56 crewmen. Survivors were rescued by and . (en)
- World War II: Operation Shingle: The was torpedoed and sunk in the Mediterranean Sea west of Naples, Campania, Italy by with the loss of 417 of her 623 crew. Survivors were rescued by and . (en)
- Carrying general cargo including war supplies, the cargo ship struck Boon Island Ledge, a reef off Boon Island in the Gulf of Maine off Maine during a storm and broke in half. Her bow section sank on the inshore side of Boon Island Ledge in up to of water at , and her stern section sank approximately south of Boon Island in of water at . Twenty-four members of her crew perished. She was on a voyage from Saint John, New Brunswick, Canada to Calcutta, India. (en)
- World War II: Convoy JW 57: The M-class destroyer was torpedoed and sunk in the Arctic Ocean off Nordkapp, Norway by with the loss of 220 of her 236 crew. (en)
- World War II: The Ryusei Maru-class auxiliary transport ship was torpedoed and sunk in the Java Sea by . An unknown number of troops and prisoners of war and about 3,000 Javanese and 34 crew were killed. (en)
- The Fairmile D motor torpedo boat was wrecked in the Shetland Islands. (en)
- The Type 1939/40 Schnellboot was sunk in a collision with in the North Sea . (en)
- World War II: The R 41 Type minesweeper was destroyed by fire in an Allied air raid on Dieppe, Seine-Inférieure, France. (en)
- World War II: Convoy Wewak No. 8: The cargo ship was torpedoed and sunk in the Pacific Ocean off New Guinea by . 418 Indian soldiers and 43 crewmen were killed. (en)
- World War II: Convoy A: The Tacoma Maru-class transport was torpedoed and sunk near Halmahera by . Two crewmen were killed. (en)
- World War II: Continuation War: The VMV-8-class patrol boat was sunk at Helsinki by Soviet aircraft. (en)
- World War II: The Ekwator-class naval trawler was sunk off Lorient by mines. (en)
- The Type IIB submarine sank near Pillau in a diving accident with the loss of all 29 crew. (en)
- The coaster collided with Triton and sank in Bergen harbour, Norway. (en)
- World War II: The patrol boat was bombed and sunk in the South China Sea off Hongay, French Indochina by North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. (en)
- World War II: The Waihora Maru-class auxiliary transport was bombed and sunk in the Formosa Strait north of Kuku Point by Consolidated B-24 Liberator aircraft of the United States Fourteenth Air Force. Seven crewmen were killed. (en)
- World War II: Operation Shingle: The landing ship tank was torpedoed and sunk in the Mediterranean Sea by . (en)
- World War II: Convoy MO-72: The tanker was torpedoed and sunk in the Mindoro Strait by . 45 crewmen were killed. (en)
- World War II: The submarine chaser struck a mine and sank in the Tyrrhenian Sea off Genoa. (en)
- World War II: The auxiliary schooner struck a mine and sank at Falsterbo. Her crew were rescued. She was refloated in March 1945, repaired and returned to service. (en)
- World War II: The Shin Yubari Maru-class auxiliary collier was torpedoed and sunk in the Pacific Ocean west of Saipan by . Seven crewmen were killed. Some survivors were rescued by fishing boats, a submarine rescued more ten days later. (en)
- World War II: The transport boat, that had run aground on rocks previously, was captured by Yugoslav Partizans and scuttled by burning. (en)
- World War II: The minesweeper was sunk at Svendborg, Denmark by Danish saboteurs. (en)
- World War II: Operation Hailstorm: Convoy No. 4215: The was shelled and sunk in the Pacific Ocean north west of Truk by and with the loss of all 239 crew. (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean south of Truk by . (en)
- World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by . (en)
- World War II: Convoy BE 146 ST: The cargo ship's steering failed and she ran aground, exploded, and sank off Haugesund, Rogaland, Norway. All crew survived. (en)
- World War II: Convoy MOTA-01: The Imperial Japanese Army-chartered Yoshida Maru No. 1-class transport was torpedoed and sunk in the Bashi Channel south of Formosa by . An unknown number of passengers and 33 crewmen were killed. (en)
- World War II: Convoy O-003: The Kokai Maru-class auxiliary transport was bombed and sunk north of New Hanover Island by North American B-25 Mitchell aircraft of the 500th and 501st Squadrons, 345th Bomb Group, United States Fifth Air Force. Seven passengers and nineteen crewmen were killed. An unknown number of survivors were rescued by . (en)
- World War II: The Type IXC/40 submarine was depth charged and damaged in the Atlantic Ocean west of the Hebrides by a Vickers Wellington aircraft of 612 Squadron, Royal Air Force with the loss of one of her 57 crew. She was consequently scuttled due to damage received. (en)
- The landing craft mechanized was lost in British home waters. (en)
- World War II: The coaster was torpedoed and sunk in the Strait of Malacca off Penang, Malaya by . (en)
- World War II: Operation Hailstorm: The anchored Buenos Aires Maru-class auxiliary transport was bombed and damaged in the Pacific Ocean east of Umon Island, Truk by United States Navy aircraft. She sank the next day in of water. Two crewmen were killed. (en)
- World War II: The cargo ship was sunk in an air attack at Rabaul, New Guinea. (en)
- The auxiliary minesweeper was bombed and sunk at Tourane, French Indochina by North American B-25 Mitchell aircraft of the United States Fourteenth Air Force. Two crewmen were killed. (en)
- World War II: Operation Hailstorm: The 5,831-gross register ton Daifuku Maru No. 1-class auxiliary transport was bombed and sunk in of water in Truk Lagoon by United States Navy aircraft from the aircraft carrier . Five crewmen were killed. (en)
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