List of shipwrecks in October 1943

The list of shipwrecks in October 1943 includes ships sunk, foundered, grounded, or otherwise lost during October 1943.

1 October

 * MV Empire Commerce (🇬🇧 United Kingdom): World War II: Convoy MKS 26: The tanker was torpedoed and sunk in the Mediterranean Sea off Philippeville, Algeria (37.31667°N, 6.66667°W) by GS U-410 . All 51 people on board were rescued by HMS Alisma (K185).
 * ITALIAN DESTROYER Euro : World War II: The Turbine-class destroyer was bombed and sunk by German aircraft off Leros Island, Greece.
 * SS Fort Howe (🇬🇧 United Kingdom): World War II: Convoy MKS 26: The Fort ship was torpedoed and sunk in the Mediterranean Sea (37.31667°N, 6.66667°W) by GS U-410 with the loss of two of her 70 crew. Survivors were rescued by HMS Alisma (K185) and HMS Spirea (K08) (both ).
 * JAPANESE SUBMARINE I-20 : World War II: The Type C submarine was shelled and sunk in the Pacific Ocean off Vella Lavella, Solomon Islands 7.66667°N, 157.16667°W by USS Eaton (DD-510).
 * SS Kinkasan Maru (🇯🇵 Japan): World War II: Convoy SO-805: The cargo ship was torpedoed and sunk in the Pacific Ocean off the Admiralty Islands (4°N, 143.83333°W) by USS Peto (SS-265) . 3 crewmen killed.
 * HMS LCT 553 : World War II: The Mk 1 Landing Craft Tank was lost in the Mediterranean Sea.
 * SS Sergej Kirov ( Soviet Union): World War II: Convoy VA 18: The cargo ship was torpedoed and sunk in the Kara Sea 12 nmi south east of Izvestij Island (76.8°N, 83.86667°W) by GS U-703 with the loss of one of her 54 crew. Survivors were rescued by T-909.
 * SS Storviken (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk in the Indian Ocean (11.75°N, 48.11667°W) by JAPANESE SUBMARINE I-10 with the loss of 37 of her 56 crew. Some of the survivors were rescued by HMS Sennen, others reached land.
 * SOVIET MINESWEEPER T-896 : World War II: Convoy VA 18: The auxiliary minesweeper was torpedoed and sunk in the Kara Sea (75.46667°N, 83.41667°W) by GS U-960 with the loss of all 43 crew.
 * MV Tahsinia (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed, shelled and sunk in the Laccadive Sea north east of the Maldive Islands (6.85°N, 74.63333°W) by GS U-532 . All 48 crew were rescued by SS Nevasa (🇬🇧 United Kingdom) or reached land in their lifeboats.
 * SS Tonei Maru (🇯🇵 Japan): World War II: Convoy SO-805: The cargo ship was torpedoed and sunk in the Pacific Ocean off the Admiralty Islands (4°N, 143.83333°W) by USS Peto (SS-265) . 10 crewmen killed.

2 October

 * SS Haiching (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Arabian Sea 80 nmi west south west of Bombay, India (18.76667°N, 71.91667°W) by GS U-168 with the loss of twelve of her 70 crew. Survivors were rescued by the dhow Mahadro Prasad ( undefined).
 * USS LCT 496 : World War II: The LCT-1-class Landing Craft, Tank was shelled and sunk in the English Channel.
 * HMS LCT 618 : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea.
 * SS Stanmore (🇬🇧 United Kingdom): World War II: Convoy KMS 27: The cargo ship was torpedoed and damaged in the Mediterranean Sea off Cape Ivi, Algeria (36.68333°N, 1.16667°W) by GS U-223 . She was taken in tow by HMS Filla (T212), which rescued the 59 crew. Stanmore was beached at Cape Tenes the next day but later broke in two and was declared a total loss.

3 October

 * USS Henley (DD-391) : World War II: The Bagley-class destroyer was torpedoed and sunk at Finschhaven, Papua New Guinea by JAPANESE SUBMARINE Ro-108 with the loss of fifteen of her 258 crew.
 * HMT Meror (FY1836) : World War II: The naval trawler struck a mine and sank in the North Sea off the mouth of the Humber.
 * X 10 : World War II: The midget submarine was scuttled in the North Sea.

4 October

 * SS La Plata (1922) (🇩🇪 Germany): World War II: The cargo ship was bombed by aircraft and beached near Bodø, Norway.
 * SS Livadia (1922) (🇩🇪 Germany): World War II: The cargo ship was shelled and sunk off Calais, France.
 * SS Marit (1918) (🇳🇴 Norway): World War II: Convoy XT 4: The tanker was torpedoed and sunk in the Mediterranean Sea (32.95°N, 21.18333°W), by GS U-596 with the loss of two of her 72 crew. Survivors were rescued by HMML-350.
 * SS Rabat (1929) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Bodø, Norway.
 * MV Skramstad : World War II: Operation Leader: The cargo ship was bombed and sunk at Bodø, Nordland, Norway by aircraft based on USS Ranger (CV-4).
 * MS Topeka (1925) (🇳🇴 Norway): World War II: Operation Leader: The cargo ship was bombed by aircraft off Sandnessjøen, Norway, and beached. Wrecked off Jæren while being towed away on 1 December 1945.
 * GS U-279 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (60.66667°N, -26.5°W) by a Lockheed Ventura aircraft of the United States Navy with the loss of all 48 crew.
 * GS U-389 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Iceland (60.85°N, -28.43333°W) by a Consolidated B-24 Liberator aircraft of 120 Squadron, Royal Air Force with the loss of all 50 crew.
 * GS U-422 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (43.3°N, -28.96667°W) by Grumman TBF Avenger and Grumman F4F Wildcat aircraft based on USS Card (CVE-11) with the loss of all 49 crew.
 * GS U-460 : World War II: The Type XIV submarine was depth charged and sunk in the Atlantic Ocean (43.3°N, -28.96667°W) by Grumman TBF Avenger and Grumman F4F Wildcat aircraft based on USS Card (CVE-11) with the loss of 62 of her 64 crew.
 * SS Vaagan (🇳🇴 Norway): World War II: Operation Leader: The cargo ship was bombed and sunk by aircraft based on USS Ranger (CV-4).

5 October

 * SS Chicago Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the East China Sea by USS Tullibee (SS-284).
 * SS Konron Maru (🇯🇵 Japan): World War II: The passenger ship was torpedoed and sunk in the Tsushima Strait off Honshu by USS Wahoo (SS-238) with the loss of 544 lives.
 * ITALIAN MINELAYER Legnano : World War II: The Azio-class minelayer was bombed and sunk by German aircraft off Leros Island, Greece.
 * SS Prode ( undefined): World War II: The cargo ship was sunk at Portolago, Leros, Greece by Luftwaffe aircraft.
 * GS U-336 : World War II: The Type VIIC submarine was sunk in the Denmark Strait (62.71667°N, -27.28333°W) by a rocket attack by a Lockheed Hudson aircraft of 269 Squadron, Royal Air Force with the loss of all 50 crew.
 * USS LST-448 : World War II: The Landing Ship Tank sank under tow south of Vella Gulf (-8.05°N, 156.71667°W) after being bombed & damaged by Japanese aircraft west of Vella Lavella (-7.75°N, 156.5°W) on 1 October.

6 October

 * SOVIET DESTROYER Besposhchadny : World War II: The was bombed and sunk in the Black Sea off The Crimea by Ju-87 Stukas.
 * USS Chevalier (DD-451) : World War II: Naval Battle of Vella Lavella: The Fletcher-class destroyer was torpedoed and damaged, with her bows blown off. She was then rammed in the stern by USS O'Bannon (DD-450) and further damaged. She managed to sink a Japanese destroyer despite this damage. She was scuttled the next day off Vella Lavella, Solomon Islands by a torpedo from USS La Vallette (DD-448).
 * JAPANESE TANKER Kazalhaya : World War II: The tanker was torpedoed and damaged in the Pacific Ocean off the Caroline Islands by USS Steelhead (SS-280) . She was torpedoed and sunk later that day by USS Tinosa (SS-283).
 * SOVIET DESTROYER Kharkov : World War II: The Leningrad-class destroyer was bombed and sunk in the Black Sea off The Crimea by Ju-87 Stukas.
 * SOVIET DESTROYER Sposobny : World War II: The was bombed and sunk in the Black Sea off The Crimea by Ju-87 Stukas.
 * JAPANESE DESTROYER Yūgumo : World War II: Naval Battle of Vella Lavella: The Yūgumo-class destroyer was torpedoed and sunk off Vella Lavella by USS Chevalier (DD-451) and USS Selfridge (DD-357) (both ) with the loss of 138 of her 225 crew.

7 October

 * JAPANESE TRANSPORT Kikukawa Maru : World War II: The transport caught fire and burned at Eten Island, Truk. She exploded when the fire reached her cargo of fuel. The explosion also blew apart salvage tugboat JAPANESE TUG Ojima that had come to her assistance.
 * USS LCT 215 : World War II: The LCT-1-class Landing Craft, Tank foundered and sank in heavy seas off the North African coast.
 * USS LCT 216 : World War II: The LCT-1-class Landing Craft, Tank foundered and sank in heavy seas off the North African coast.
 * HMS LCT 621 : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea.
 * JAPANESE FLEET TUG Ojima : World War II: The Tategami-class salvage tugboat was blown apart and sunk at Eten Island, Truk, when JAPANESE TRANSPORT Kikukawa Maru exploded while she was alongside providing assistance fighting a fire on board.
 * USS S-44 (SS-155)  : World War II: The S-class submarine was shelled and sunk by JAPANESE ESCORT Ishigaki  18 miles from Uomi Saki, Aruito Island, Kuriles. 2 survivors rescued and made P.O.W.s, 55 crewmen killed.

8 October

 * SS Dainichi Maru (Mitsui Bussan, 1922) (🇯🇵 Japan): World War II: The cargo liner was torpedoed and sunk in the South China Sea west of Luzon, Philippines by USS Gurnard (SS-254).
 * SS Empire Activity (🇬🇧 United Kingdom): The cargo ship was wrecked off Newfoundland.
 * SS Kashu Maru : World War II: The Transport was torpedoed and sunk in the Pacific Ocean (-0.43333°N, 146.28333°W) by USS Guardfish (SS-217) . 1 crewman killed.
 * ORP Orkan : World War II: Convoy SC 143: The M-class destroyer was torpedoed and sunk in the Atlantic Ocean off Greenland (56.5°N, -26.43333°W) by GS U-378 with the loss of 184 of her 228 crew. Survivors were rescued by HMS Musketeer (G86).
 * SS Taian Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the South China Sea west of Luzon by USS Gurnard (SS-254).
 * GS U-419 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (56.51667°N, -27.08333°W) by Consolidated B-24 Liberator aircraft of 86 Squadron, Royal Air Force with the loss of 48 of her 49 crew.
 * GS U-610 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (55.75°N, -24.55°W) by a Short Sunderland aircraft of 423 Squadron, Royal Canadian Air Force with the loss of all 51 crew.
 * GS U-643 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (56.23333°N, -26.91667°W) by Consolidated B-24 Liberator aircraft of 86 and 120 Squadrons, Royal Air Force with the loss of 30 of her 48 crew.

9 October

 * USS Buck (DD-420) : World War II: Operation Avalanche: The Sims-class destroyer was torpedoed and sunk in the Tyrrhenian Sea off Salerno, Italy (39.95°N, 14.46667°W) by GS U-616 with the loss of 150 of her 247 crew. Survivors were rescued by USS Gleaves (DD-423)  and HMS LCT-170 (.
 * SS Kogane Maru (🇯🇵 Japan): World War II: The cargo liner was torpedoed and sunk in the Banda Sea off Ambon Island by USS Rasher (SS-269).
 * HMS Panther (G41) : World War II: The P-class destroyer was bombed and sunk in the Scarpanto Strait by Junkers Ju 87 aircraft of the Luftwaffe with the loss of 36 crew. Survivors were rescued by GREEK DESTROYER Miaoulis.
 * SS Stuttgart (1923) (🇩🇪 Germany): World War II: The passenger ship was bombed by aircraft at Gotenhafen, and scuttled off the port.
 * GERMAN PATROL BOAT UJ-1210 : World War II: The patrol boat was bombed and sunk by aircraft off Gdynia, Poland.
 * SS Yorkmar (🇺🇸 United States): World War II: Convoy SC 143: The cargo ship was torpedoed and sunk in the Atlantic Ocean 475 nmi south of Iceland (56.63333°N, -20.5°W) by GS U-645 with the loss of thirteen of the 67 people on board. Survivors were rescued by HMS Duckworth (K351)  and HMCS Kamloops (K176).

10 October

 * SS Hino Maru No. 5 : World War II: The   was bombed and sunk 24 miles west of Buka, Bouganville (-5.41667°N, 154.28333°W)  by US Army B-24s.
 * SS Isuzugawa Maru (🇯🇵 Japan): World War II: Convoy No. 432: The Transport was torpedoed and sunk in the South China Sea west of Luzon, Philippines by USS Bonefish (SS-223) . 2 passengers and 2 crewmen were killed.
 * SS Teibi Maru (🇯🇵 Japan): World War II: Convoy No. 432: The Transport was torpedoed and damaged in the South China Sea west of Luzon, Philippines (14.73333°N, 110.31667°W) by USS Bonefish (SS-223) . She was beached on Mysury but sinks. 6 passengers and 8 crewmen were killed.

11 October

 * SS George H. Himes (🇺🇸 United States): World War II: The Liberty Ship was torpedoed by Japanese aircraft off Koli Point, Guadalcanal and beached. Later repaired and returned to service.
 * HMS HDML 1054 : World War II: The Harbor Defence Motor Launch was wrecked off Tees.
 * HMS Hythe (J194) : World War II: The Bangor-class minesweeper was torpedoed and sunk in the Mediterranean Sea off Bougie, Algeria (37.06667°N, 5°W) with the loss of all 62 crew.
 * SS Jalabala (1927) ( undefined): World War II: The cargo ship was torpedoed and sunk in the Laccadive Sea west of Cape Comorin (11.66667°N, 75.31667°W) by GS U-532 with the loss of five of her 80 crew.
 * SS John H. Couch (🇺🇸 United States): World War II: The Liberty Ship was torpedoed by Japanese aircraft off Koli Point, Guadalcanal and set on fire resulting in the ship being burned out. 1 SeaBee, 1 Gunner and 1 crewman killed. Taken under tow by USS Pawnee (AT-74) but capsized and sank on 13 October two miles east of Koli Point.
 * USS Wahoo (SS-238) : World War II: The Gato-class submarine was bombed and sunk in the La Perousé Strait, Sea of Japan by Japanese aircraft with the loss of all 60 crew.

12 October

 * SS Ammerland (1923) (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk by a submarine of the North Cape, Norway.
 * SS Keisho Maru (🇯🇵 Japan): World War II: The Transport was bombed and sunk at Rabaul during an air raid by the 5th Air Force consisting of B-17s, B-24s, B-25 Mitchells, P-38 Lightnings and Royal Australian Air Force Beaufighters.
 * SS Kosei Maru (🇯🇵 Japan): World War II: The Transport was bombed and sunk at Rabaul during an air raid by the 5th Air Force consisting of B-17s, B-24s, B-25 Mitchells, P-38 Lightnings and Royal Australian Air Force Beaufighters.
 * SS Kurogone Maru (🇯🇵 Japan): World War II: The Cargo Lighter was bombed and sunk at Rabaul during an air raid by the 5th Air Force consisting of B-17s, B-24s, B-25 Mitchells, P-38 Lightnings and Royal Australian Air Force Beaufighters.
 * SS Mishima Maru : World War II: The Guardship was bombed and sunk at Rabaul during an air raid by the 5th Air Force consisting of B-17s, B-24s, B-25 Mitchells, P-38 Lightnings and Royal Australian Air Force Beaufighters.
 * HMS ML 835 : World War II: The Fairmile B motor launch was bombed and sunk at Leros.
 * SS Wakamatsu Maru No. 1 (🇯🇵 Japan): World War II: The Cargo Lighter was bombed and sunk at Rabaul during an air raid by the 5th Air Force consisting of B-17s, B-24s, B-25 Mitchells, P-38 Lightnings and Royal Australian Air Force Bristol Beaufighters.

13 October

 * USS Bristol : World War II: The Gleaves-class destroyer was torpedoed and sunk in the Mediterranean Sea off Algiers, Algeria (37.31667°N, 6.31667°W) by GS U-371  with the loss of 52 of her 276 crew. Survivors were rescued by USS Trippe (DD-403) and USS Wainwright (DD-419) (both ).
 * GS U-402 : World War II: The Type VIIC submarine was torpedoed and sunk in the Atlantic Ocean (48.93333°N, -29.68333°W) by Grumman TBF Avenger aircraft based on USS Card (CVE-11) with the loss of all 50 crew.

14 October

 * USCGC Dow (WYP 353) : Patrol ship lost by grounding off Mayaguez, Puerto Rico.
 * SS Kozui Maru (🇯🇵 Japan): World War II: The Oiler was torpedoed and sunk in the East China Sea north west of Okinawa (27.58333°N, 127.5°W)  by USS Grayback (SS-208) . 21 passengers, 4 Gunners and 3 crewmen were killed.

15 October

 * SS Chicago Maru : World War II: Convoy No. 105: The Transport was torpedoed and sunk in the South China Sea off the west coast of Formosa (24.5°N, 120.43333°W) by USS Tullibee (SS-284) . 42 troops and 8 crewmen were killed. Survivors rescued by SS San Ramon Maru, SS Nichiei Maru , and SS Gyokurei Maru (🇯🇵 Japan).
 * SS Essex Lance (🇬🇧 United Kingdom): World War II: Convoy ONS 20: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland (57.88333°N, -28°W) by GS U-426 . All 52 crew were rescued by SS Accrington (🇬🇧 United Kingdom).
 * SS James Russell Lowell (🇺🇸 United States): World War II: Convoy GUS 18: The Liberty ship was torpedoed and damaged in the Mediterranean Sea off the coast of Algeria by GS U-371 . She was beached at Philippeville where she was declared a constructive total loss. Breaks in two and sinks two weeks later. All 76 crew were rescued by HMT Southern Sea (FY326).
 * HMS MTB 636 : World War II: The Fairmile D motor torpedo boat was sunk by gunfire by HMS MGB 658 off Elba.
 * SS Merano ( undefined): World War II: The cargo ship was scuttled off Cazza Island, Croatia.

16 October

 * SS Kari (1920) (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk in the Aegean Sea off Piraeus, Greece by HMS Torbay (N79) . She was carrying German soldiers. About 180 of the 500 on board were killed.
 * HMS MTB 356 : World War II: The Vosper 72' Class Motor Torpedo Boat was sunk by gunfire from Kriegsmarine surface vessels off Holland.
 * USS Moonstone (PYc-9) : The naval yacht collided with USS Greer (DD-145) ( in the Atlantic Ocean off the mouth of the Indian River (38.5°N, -74.1°W) and sank with the loss of one of her 50 crew.
 * GS U-470 : World War II: The Type VIIC submarine was depth charged and sunk in the Western Approaches (58.33333°N, -29.33333°W by Consolidated B-24 Liberator aircraft of 59 and 120 Squadrons, Royal Air Force with the loss of 46 of her 48 crew.
 * GS U-533 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Gulf of Oman by Bristol Bisley aircraft of 244 Squadron, Royal Air Force with the loss of 52 of her 53 crew.
 * GS U-844 : World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean south west of Iceland (58.5°N, -27.26667°W) by two Consolidated B-24 Liberator aircraft of 59 and 86 Squadrons, Royal Air Force with the loss of all 53 crew.
 * GS U-964 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Iceland (57.45°N, -27.28333°W) by a Consolidated B-24 Liberator aircraft of 86 Squadron, Royal Air Force with the loss of 47 of her 50 crew. Survivors were rescued by GS U-231.

17 October

 * GERMAN AUXILIARY CRUISER Michel : World War II: The auxiliary cruiser was torpedoed and sunk by USS Tarpon (SS-175) east of Yokohama, Japan.
 * GS U-540 : World War II: The IXC/40 submarine was depth charged and sunk in the Atlantic Ocean east of Cape Farewell, Greenland (58.63333°N, -31.93333°W) by Consolidated B-24 Liberator aircraft of 59 and 120 Squadrons, Royal Air Force with the loss of all 55 crew.
 * GS U-631 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Cape Farewell (58.21667°N, -32.48333°W) by HMS Sunflower (K41) with the loss of all 54 crew.
 * GS U-841 World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean east of Cape Farewell (59.95°N, -31.1°W) by HMS Byard (K315)  with the loss of 27 of her 54 crew.

18 October

 * SS Taichi Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean south of Honshu by USS Lapon (SS-260).
 * SS Tairin Maru : World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean (0.36667°N, 143.38333°W) by USS Silversides (SS-236) . 2 Gunners, 1 Watchman, 1 crewman killed.

19 October

 * SS Delisle (🇺🇸 United States): World War II: Convoy WB 65: The cargo ship struck a mine and sank in the Atlantic Ocean 15 nmi off St. John's, Newfoundland (47.31667°N, -52.45°W). All 42 crew were rescued by HMCS Miscou (T277).
 * SS Penolver (🇬🇧 United Kingdom): World War II: Convoy WB 65: The cargo ship struck a mine and sank in the Atlantic Ocean 15 nmi off St. John's (47.31667°N, -52.45°W) with the loss of 26 of her 40 crew. Survivors were rescued by HMCS Miscou (T277).

20 October

 * SS Nagaragawa Maru (1917) ( Empire of Japan): World War II: The cargo ship was bombed and sunk off Dutch New Guinea, Dutch East Indies (-0.31667°N, 132.4°W) by aircraft.
 * SS Sana Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in Bandon Bay, French Indochina (12.6°N, 109.5°W) by USS Kingfish (SS-234).
 * GS U-378 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (47.66667°N, -28.45°W) by Grumman TBM Avenger and Grumman F4F Wildcat aircraft based on USS Core (CVE-13) with the loss of all 48 crew.

21 October

 * HMCS Chedabucto (J168) : The Bangor-class minesweeper collided in the St Lawrence River with SS Lord Kelvin (🇬🇧 United Kingdom) and sank with the loss of one of her 72 crew.
 * USS Murphy (DD-603) : World War II: Whilst, escorting a convoy, the Benson-class destroyer was in collision with SS Bulkoil (🇬🇧 United Kingdom) off the coast of New York/New Jersey and was cut in two. The bow section sank with the loss of 36 of her 265 crew. The stern section was repaired and returned to service with a new bow section.
 * GS U-431 : World War II: The Type VIIC submarine was depth charged and sunk in the Mediterranean Sea off Algiers, Algeria by a Vickers Wellington aircraft of 179 Squadron, Royal Air Force with the loss of all 52 crew.

22 October

 * GREEK DESTROYER Adrias : World War II: The Hunt-class destroyer struck a mine losing her bow in the Aegean Sea off Kalymnos. She was beached at Gümüşlük, Turkey. She was later repaired and returned to service.
 * JAPANESE TRANSPORT Awata Maru : World War II: The Transport was torpedoed in the East China Sea off Keelung Formosa, north of Miyako jima, (26.53333°N, 125.08333°W) by USS Grayback (SS-208) . She exploded and sank with 1,087 troops of the 17th Inf. Division and 223 crewmen killed. Survivors, 76 troops and 88 crewmen, rescued by JAPANESE DESTROYER Maikaze and JAPANESE DESTROYER Nowaki both.
 * HMS Hurworth (L28) : World War II: The Hunt-class destroyer struck a mine and sank in the Aegean Sea (36.98333°N, 27.1°W) off Kalymnos with the loss of at least six crew. Eighty-five crew were rescued.
 * RFA Litiopa : World War II: The tanker was torpedoed and damaged in the Atlantic Ocean (6.3°N, -11.91667°W) by GS U-68 (1940) . She sank the next day. All 35 crew survived, some of them were rescued by HMS Snowdrop (K67) while other reached land in their lifeboats.
 * HMT Orfasy : World War II: The naval trawler was torpedoed and sunk in the Atlantic Ocean (5.96667°N, -11.5°W) 185 miles southeast of Freetown, Liberia by GS U-68 (1940) with the loss of all 30 crew.

23 October

 * SS Campos (🇧🇷 Brazil): World War II: The cargo liner was torpedoed and sunk in the South Atlantic (-25.11667°N, -45.66667°W) by GS U-170 with the loss of twelve of the 63 people on board.
 * HMS Charybdis (88) : World War II: The Dido-class cruiser was torpedoed and sunk in the Bay of Biscay off Ouessant, Finistère, France (48.98333°N, -3.65°W by Elbing-class torpedo boats T23 and T27 with the loss of 452 crew.
 * HMS Cromarty (J09) : World War II: The Bangor-class minesweeper was sunk by a mine in the Mediterranean Sea in the Straits of Bonifacio.
 * HMS Limbourne (L57) : World War II: The Hunt-class destroyer was attacked off Ouessant by Elbing-class torpedo boat T22 and severely damaged. She was scuttled by gunfire from HMS Rocket (H92).
 * MV Tanais ( Soviet Union): World War II: The coaster was torpedoed and sunk in the Black Sea off Poti (42.36667°N, 41.58333°W) by GS U-23 (1936) with the loss of eleven of her 21 crew.
 * ITALIAN CRUISER Taranto : World War II: The Magdeburg-class cruiser was bombed and sunk by Allied aircraft. Later raised, and sunk once more in September 1944. Scrapped in 1946-47.
 * GS U-274 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south west of Iceland (57.23333°N, -27.83333°W) by HMS Duncan (D99), HMS Vidette (D48) (both ) and a Consolidated B-24 Liberator aircraft of 224 Squadron, Royal Air Force.

24 October

 * HMS Eclipse (H08) : World War II: The E-class destroyer struck a mine and sank in the Aegean Sea east of Kalymnos, Greece (37.01667°N, 27.18333°W) with the loss of 119 of her 145 crew and 134 troops.
 * SS Johore Maru : World War II: Convoy O-006: The cargo liner was torpedoed and sunk in the Pacific Ocean by USS Silversides (SS-236) . 77 passengers and 7 crewmen killed.
 * SS Kazan Maru : World War II: Convoy O-006: The cargo ship was torpedoed and sunk in the Pacific Ocean (2.5°N, 144.73333°W) by USS Silversides (SS-236) . 4 Guards and 3 crewmen killed.
 * Mochizuki : World War II: The was bombed and sunk in the Solomon Sea 90 miles south south west of Rabaul (-5.7°N, 151.66667°W) by US Navy PBYs. 10 crewmen killed. Survivors were rescued by JAPANESE DESTROYER Uzuki.
 * MV Siranger (1939) (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean (°N, -39.45°W) by GS U-155 (1941) . All 51 people on board survived.
 * SS Tennan Maru : World War II: Convoy O-006: The Oiler was torpedoed and sunk in the Pacific Ocean by USS Silversides (SS-236) . 5 passengers and 42 crewmen killed.
 * GS U-566 : World War II: The Type VIIC submarine was depth charged and damaged in the Atlantic Ocean north west of the Azores, Portugal by a Vickers Wellington aircraft of 179 Squadron, Royal Air Force. She was consequently scuttled at 41.2°N, -9.51667°W). All 49 crew survived.

25 October

 * SS Nissho Maru (🇯🇵 Japan): World War II: The tanker was torpedoed and sunk in the Philippine Sea by USS Hoe (SS-258).
 * HMT William Stephen : World War II: The naval trawler was torpedoed and sunk in the North Sea off Cromer, Norfolk by GERMAN TORPEDO BOAT S-74.
 * GERMAN TORPEDO BOAT S-63 and GERMAN TORPEDO BOAT S-88 (both ): World War II: The schnellboots were torpedoed and sunk in the North Sea off Cromer by MGB 603 and MGB 607 (both ).

26 October

 * SS Hokuzan Maru (🇯🇵 Japan): World War II: The cargo ship was bombed and sunk off Kiungshan, China (20.08333°N, 110.41667°W) by United States Army Air Forces aircraft.
 * SS James Longstreet (🇺🇸 United States): The Liberty ship was driven ashore at Sandy Hook, Eastham, Massachusetts in a gale and was wrecked.

27 October

 * SS Padua (🇵🇹 Portugal): World War II: The cargo ship struck a mine and sank in the Mediterranean Sea off Marseille, Bouches-du-Rhône, France with the loss of six crew.
 * SS Nanman Maru (🇯🇵 Japan): World War II: Convoy FU-607: The ship was torpedoed and sunk in the Pacific Ocean (12.03333°N, 134.46667°W) by USS Flying Fish (SS-229).

28 October

 * HMS LCT 115 : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea.
 * GS U-220 : World War II: The Type X submarine was depth charged and sunk in the Atlantic Ocean (48.88333°N, -33.5°W) by Grumman TBM Avenger and Grumman F4F Wildcat aircraft based on USS Block Island (CVE-21) with the loss of all 56 crew.
 * USS YP-88 :World War II: The Patrol Boat ran aground and sank off Cape Amchitka, Amchitka Island, Alaska Territory.

29 October

 * GS U-282 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean south east of Iceland (55.46667°N, -31.95°W) by HMS Duncan (D99), HMS Sunflower (K41) and HMS Vidette (D48) (all ) with the loss of all 48 crew.

31 October

 * SS John Banvard (🇺🇸 United States): The Liberty ship came ashore at Terceira, Azores, Portugal and was declared a constructive total loss.
 * SS Hallfried (1918) 🇳🇴 Norway): World War II: Convoy MKS 28: The cargo ship was torpedoed and sunk in the Atlantic Ocean (44°N, -21.5°W) by GS U-262 with the loss of 30 of her 33 crew. Survivors were rescued by HMS Wrestler (D35).
 * SS Koryo Maru (🇯🇵 Japan): World War II: The tanker was torpedoed and sunk in the Pacific Ocean off Borneo by USS Rasher (SS-269).
 * SOVIET MINESWEEPER SKA-088 : World War II: The MO-class minesweeper was torpedoed and sunk in the Black Sea off Gagra by GS U-24 (1936).
 * SS New Columbia (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean (4.41667°N, 5.05°W by GS U-68 (1940) . All 84 crew were rescued by SS Conakrian (🇬🇧 United Kingdom).
 * GS U-306 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean north east of the Azores, Portugal (46.31667°N, -20.73333°W by HMS Geranium (K16) and HMS Whitehall (D94) (both ) with the loss of all 51 crew.
 * GS U-584 : World War II: The Type VIIC submarine was sunk in the Atlantic Ocean (49.23333°N, -31.91667°W) by three Grumman TBM Avenger aircraft based on USS Card (CVE-11) with the lost of all 53 crew.
 * GS U-732 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (35.9°N, -5.86667°W) by HMS Douglas (D90) and HMT Imperialist (FY126) (both ) with the loss of 31 of her 49 crew.

Unknown date

 * SOVIET SUBMARINE A-3 : World War II: The American Holland-class submarine was lost late in October. Probably sunk in Korkinit Bay by GERMAN AUXILIARY SUBMARINE CHASER Ship 19 on 28 October.
 * SS Dithmarschen (1903) (🇩🇪 Germany): The cargo ship was lost to causes unknown in the Mediterranean.
 * USS Dorado (SS-248) : World War II: The Gato-class submarine left New Haven, Connecticut on October 6 for the Panama Canal and wasn't heard from again. Probably was sunk in the Caribbean Sea on or about 12 October by US aircraft with the loss of all 60 crew.
 * HMS HDML 1015 : World War II: The Harbour Defence Motor Launch foundered in a storm in the Mediterranean Sea sometime in October.
 * HMS LCI(L) 309 : World War II: The LCI-1-class Landing Craft, Infantry was sometime in October.
 * SOVIET SUBMARINE M-172 : World War II: The M-class submarine was lost after leaving Base on 1 October. Probably lost to a mine off Verangerfjord.
 * SOVIET SUBMARINE M-174 : World War II: The M-class submarine was lost after leaving Base on 14 October. Probably lost to a mine off Verangerfjord.
 * SOVIET SUBMARINE Shch-403 : World War II: The Shchuka-class submarine was lost after leaving Base on 2 October. Probably lost to a mine off Tanafjord.
 * HMS Trooper (N91) (: World War II: The T-class submarine struck a mine and sank in the Aegean Sea off Leros, Greece sometime between 26 September and 17 October.
 * GS U-420 : World War II: The Type VIIC submarine disappeared on patrol in the Atlantic Ocean on or after 20 October with the loss of all 49 crew. Cause unknown.
 * HMS Usurper (P56) : World War II: The U-class submarine was lost in the Gulf of Genoa sometime between 3 and 12 October, probably on the 3rd by GERMAN AUXILIARY SUBMARINE CHASER UJ-2208, with the loss of all 46 crew.