List of shipwrecks in October 1941

The list of shipwrecks in October 1941 includes all ships sunk, foundered, grounded, or otherwise lost during October 1941.

1 October

 * SS San Florentino (🇬🇧 United Kingdom): World War II: Convoy ON 19: The tanker straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean (52.83333°N, -34.66667°W) by GS U-94 (1940) with the loss of 23 of her 58  crew. She broke in two the next day and was scuttled by HMCS Alberni (K-103)  and USCGC Campbell (WPG-32) . Survivors were rescued by HMS Mayflower (K191).
 * GERMAN SUBMARINE CHASER UJ-117 : World War II: The submarine chaser struck a mine and sank in the Baltic Sea off Hanko, Finland.

2 October

 * SS Castellon (1935) ( undefined): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea 10 nmi north west of Benghazi, Libya (32.5°N, 19.15°W) by HMS Perseus (N36).
 * SS Churruca (🇬🇧 United Kingdom): The cargo ship exploded and sank at Alexandria, Egypt. Later salvaged, repaired and returned to service.
 * SS Empire Wave (🇬🇧 United Kingdom): World War II: Convoy ON 19: The CAM ship was torpedoed and sunk in the Atlantic Ocean 500 nmi east of Cape Farewell, Greenland (58.13333°N, -32.43333°W) by GS U-652 with the loss of 29 of her 60 crew. Survivors were rescued by the trawler Surprise (Light Blue Flag of Iceland.svg Iceland).
 * SS Hatasu (🇬🇧 United Kingdom): World War II: Convoy ON 19: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean 600 nmi east of Cape Race, Newfoundland by GS U-431 with the loss of 40 or her 47 crew.
 *  Hertta (🇫🇮 Finland): World War II: The schooner was rammed and sunk in the Kalmar Strait by SS Elin ( Nazi Germany).
 * JAPANESE SUBMARINE I-61 : The Kaidai-class submarine collided with JAPANESE AUXILIARY GUNBOAT Kiso Maru  and sank in the Tsushima Strait off Iki Island (33.66667°N, 129.66667°W) with the loss of all 70 crew. Salvaged in February 1942 and scrapped at Sasebo, Nagasaki.
 * MV Tuva (1935) (🇳🇱 Netherlands): World War II: Convoy ON 19A: The cargo ship was torpedoed and sunk in the Atlantic Ocean (54.26667°N, -26.6°W) by GS U-575 with the loss of one of her 35 crew. Survivors were rescued by HMCS St. Croix (I81).

3 October
For the loss of the German cargo ship Yavlova'' on this day, see the entry for 28 September 1941
 * ARA Corrientes : The Buenos Aires-class destroyer collided with ARA Almirante Brown in the South Atlantic 54 nmi north east of Mar del Plata and sank with the loss of ten of her 169 crew.
 * MV Dnepr ( Soviet Union): World War II: The passenger ship was torpedoed and sunk in the Black Sea by Luftwaffe aircraft with the loss of 40 of the 203 people on board. Survivor were rescued by SOVIET MINESWEEPER Yakor.
 * SS Klara (1930) (🇩🇪 Germany): World War II: The supply ship was torpedoed and sunk in the Atlantic Ocean north of the Azores, Portugal by HMS Kenya (14) . GS U-129 (1941) rescued 129 survivors.
 * GERMAN DEPOT SHIP Konrad : World War II: The submarine depot ship was shelled and sunk in the Atlantic Ocean west of Cape Finisterre, Spain by HMS Kenya (14).
 * MV Klara (🇩🇪 Germany): World War II: The cargo liner was shelled and sunk by HMS Kenya (14) . GS U-129 (1941) ( rescued all 119 crew.
 * SS Oued Yquem (🇫🇷 Vichy France): World War II: The cargo ship was torpedoed and sunk in the Tyrrhenian Sea off Sardinia, Italy (40.96667°N, 9.98333°W) by HNLMS O-21.

4 October

 * MV Borgny (🇩🇪 Germany): World War II: The tanker was torpedoed and sunk in the North Sea by HNOMS MTB 56 with the loss of fourteen of her 27 crew. Survivors were rescued by GERMAN MINESWEEPER M1101 and GERMAN TORPEDO BOAT V5505 (both ).
 * MV Théophile Gautier (🇫🇷 Vichy France): World War II: The ocean liner was torpedoed and sunk in the Aegean Sea off Eubée, Greece (37.75°N, 24.58333°W) by HMS Talisman (N78) with the loss of nineteen lives.
 * GS U-111 (1940) : World War II: The Type IXB submarine was shelled and sunk in the Atlantic Ocean south of Tenerife, Spain by HMT Lady Shirley with the loss of eight of her 52 crew.
 * HMS Whippet: World War II: The anti-submarine vessel was bombed and sunk in the Mediterranean Sea (32.15°N, 25.28333°W) north east of Bardiyah by Luftwaffe aircraft with the loss of one crew member. Survivors were rescued by HMT Svana and a D lighter (both ).

5 October

 * SS C Jon (🇵🇦 Panama): World War II: The coaster was torpedoed and sunk in the Atlantic Ocean (48.5°N, -13°W) by GS U-204.
 * SS Mondoc (🇨🇦 Canada): The bulk carrier was wrecked on the east coast of Trinidad.
 * MS Rialto (1926) ( undefined): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea 80 nmi north north east of Misrata, Libya (33.5°N, 15.88333°W) by Fairey Swordfish aircraft of 830 Squadron, Fleet Air Arm. ITALIAN DESTROYER Gioberti rescued 145 survivors.
 * SS Tynefield (🇬🇧 United Kingdom: World War II: The tanker struck a mine and sank in the Suez Canal with the loss of four crew.

6 October

 * SS Bjørnungen (1893) (🇳🇴 Norway): World War II: The coaster was torpedoed and sunk in the Barents Sea by SOVIET TORPEDO BOAT TKA-12 with the loss of eight crew.
 * SS Thistlegorm (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and sunk in the Red Sea off Ras Muhammad, Egypt (27.81417°N, 33.92°W) by Heinkel He 111 aircraft of the Luftwaffe with the loss of nine crew.

7 October

 * Aida (🇪🇬 Egypt): World War II: The lighthouse tender was bombed and damaged at Zafarana by Luftwaffe aircraft and was beached.

8 October

 * SS Paolo S Podesta ( undefined): World War II: The cargo ship was torpedoed and sunk south west of Favignada, Sicily by Fairey Swordfish aircraft of 830 Squadron, Fleet Air Arm.
 * SS Rosalie Moller (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and sunk in the Suez Canal by Luftwaffe aircraft with the loss of two crew. Survivors were rescued by HMAS Parramatta (U44).
 * Solombala ( Soviet Union): World War II: The tug was shelled and sunk in the Baltic Sea off Maruipol by German shore-based artillery.

9 October
No ships were lost on this day.

10 October

 * Citta di Simi ( undefined): World War II: The steamboat was sunk in the Mediterranean Sea 12 nmi off Cape Sidero, Crete (35.51667°N, 26.41667°W) by HMS Thunderbolt (N25).
 * Fugloyjin (🇫🇴 Faroe Islands): The fishing vessel was bombed and sunk at Klaksvík, Faroe Islands. She was later refloated, repaired and returned to service.
 * SS Kyma (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea (53.88333°N, 0.35°W). All crew were rescued.
 * HMS LCT 102 : World War II: Convoy OS 7: The Landing Craft, Tank was being carried as deck cargo on board SS Nailsea Manor (🇬🇧 United Kingdom) and was lost when that ship was torpedoed and sunk.
 * HMS LCT 103 : World War II: Convoy OS 7: The Landing Craft, Tank was lost in Home Waters.
 * SS Nailsea Manor (🇬🇧 United Kingdom): World War II: Convoy OS 7: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean (18.75°N, -21.3°W) by GS U-126 (1940) (. All 42 crew were rescued by HMS Violet (K35).
 * ROMANIAN MINELAYER Regele Carol I : World War II: The auxiliary minelayer struck a mine and sank in the Black Sea off Varna (43.16667°N, 28.01667°W).
 * SS Warkworth (🇬🇧 United Kingdom): World War II: The cargo ship collided with SS Selvistan (🇬🇧 United Kingdom) in the Atlantic Ocean 500 nmi south south west of the Vestmann Islands and sank with the loss of thirteen crew.

11 October

 * SS Casaregis ( undefined: World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea (34.16667°N, 12.63333°W) by Fairey Swordfish aircraft of 830 Squadron, Fleet Air Arm.
 * SS Haytian (🇬🇧 United Kingdom): World War II: The hulk was bombed and sunk in the English Channel off Portland, Dorset by Luftwaffe aircraft.
 * NB-11 : World War II: The auxiliary ship was bombed and sunk off Bergen, Norway by a Lockheed Hudson of the Royal Air Force.
 * SS Zena (1914) ( undefined: World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea south of Lampedusa (34.86667°N, 12.36667°W) by Fairey Swordfish aircraft of 830 Squadron, Fleet Air Arm.

12 October

 * A 2 and A 7 (both ): World War II: The A Lighters (LCT Mk 1s) were torpedoed and sunk in the Mediterranean Sea (32.13333°N, 24.93333°W) by GS U-75 (1940) . with the loss of 36 of the 37 people on board. The survivor was taken as a prisoner of war.
 * SS Chevington (1923) (🇬🇧 United Kingdom): World War II: Convoy FN 531: The cargo ship was torpedoed and sunk in the North Sea (52.99333°N, 1.86667°W) by GERMAN TORPEDO BOAT S-41, GERMAN TORPEDO BOAT S-47, GERMAN TORPEDO BOAT S-53, GERMAN TORPEDO BOAT S-62, GERMAN TORPEDO BOAT S-104 and GERMAN TORPEDO BOAT S-105 all with the loss of nine crew.
 * SS Corte Real (🇵🇹 Portugal): World War II: The cargo ship was intercepted in the Atlantic Ocean 80 nmi off Oporto by GS U-83 (1941) . Her passengers and crew given fifteen minutes to take to the lifeboats before she was shelled, then torpedoed and sunk.
 * SS Glynn (1918) (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and damaged in the North Sea (52.58333°N, 1.93333°W) by Luftwaffe aircraft. She was scuttled by a Royal Navy ship.
 * SS Roy (1921) (🇳🇴 Norway): World War II: Convoy FN 531: The cargo ship was torpedoed and sunk in the North Sea (52.99333°N, 1.86667°W) by GERMAN TORPEDO BOAT S-53 with the loss of three crew. Survivors were rescued by HMML 145.
 * SOVIET SUBMARINE S-8 : World War II: The S-class submarine struck a mine and sank in the Gulf of Finland north of Dagö, Estonia.

13 October
No ships were lost on this day

14 October

 * Aingeru Guardakoa (🇪🇸 Spain): World War II: The sailing ship was torpedoed and sunk in the Bay of Cádiz by GS U-204.
 * SS Bainsizza ( undefined): World War II: The cargo ship was torpedoed and damaged in the Mediterranean Sea (34.25°N, 12.2°W) by Fairey Swordfish aircraft of 830 Squadron, Fleet Air Arm. She was taken in tow by ST Max Barendt (🇩🇪 Germany), which later passed the tow to ST Ciclope ( undefined) but sank the next day.
 * HMS Fleur de Lys (K122) : World War II: Convoy OG 75: The Flower-class corvette was torpedoed and sunk west of Gibraltar (36°N, -6.5°W) by GS U-206 with the loss of 70 of her 73 crew. Survivors were rescued by a Spanish ship.
 * HMT Forerunner : The naval trawler collided with another vessel in the Thames Estuary and sank.
 * ITALIAN TORPEDO BOAT Pleiada : World War II: the torpedo boat sank at Tripoli, Libya after being bombed the day before by Royal Air Force aircraft.
 * GERMAN PATROL VESSEL UJ-1709 : World War II: The vorpostenboot was bombed and sunk west of Lista by Royal Air Force aircraft.

15 October

 * SS Empire Heron (🇬🇧 United Kingdom): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (54.08333°N, -27.08333°W) by GS U-568 with the loss of 39 of her 40 crew. The survivor was rescued by HMS Gladiolus (K34).
 * SS Ila (1939) (🇳🇴 Norway): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (53.6°N, -29.95°W) by GS U-553 with the loss of fourteen of her 21 crew. Survivors were rescued by FRENCH CORVETTE Mimosa.
 * MV Silvercedar (🇬🇧 United Kingdom): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (53.6°N, -29.95°W) by GS U-553 with the loss of 21 of the 47 people on board. Survivors were resued by FRENCH CORVETTE Mimosa.
 * MV Vancouver Island (1928) (🇨🇦 Canada): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean south west of Ireland (53.61667°N, -25.61667°W) by GS U-558 with the loss of all 105 people on board.

16 October

 * SS Bold Venture (🇵🇦 Panama): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean 500 nmi south west of Iceland (57°N, -24.5°W) by GS U-553 with the loss of eighteen of her 35 crew.
 * SS Bolshevik ( Soviet Union): World War II: The cargo ship was torpedoed and sunk in the Black Sea by Luftwaffe aircraft with the loss of sixteen of the 52 people on board. Survivors were rescued by two Soviet motor torpedo boats.
 * SS Rym (1919) (🇳🇴 Norway): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean by GS U-558 . All 21 crew were rescued by HMS Veronica (K37).

17 October

 * MV Barfonn (1931) (🇳🇴 Norway): World War II: Convoy SC 48: The tanker was torpedoed and sunk in the Atlantic Ocean (56.96667°N, -25.06667°W) by GS U-432  with the loss of fourteen of her 40 crew. Survivors were rescued by HMCS Baddeck (K-147) and HMCS Wetaskiwin (K-175) (both ).
 * SS Bold Venture (🇵🇦 Panama): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (56.16667°N, -24.5°W) by GS U-553 with the loss of seventeen of her 34 crew. Survivors were rescued by HMCS Wetaskiwin (K175).
 * SS Erviken (1920) (🇳🇴 Norway): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57°N, -24.5°W) by GS U-432  with the loss of 24 of her 38 crew. Survivors were rescued by HMS Abelia (k184) and HMS Veronica (K37) (both ).
 * SS Evros (🇬🇷 Greece): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.01667°N, -24.33333°W) by GS U-432  with the loss of all 32 crew.
 * HMS Gladiolus (K34) : World War II: Convoy SC 48: The Flower-class corvette was torpedoed and sunk in the Atlantic Ocean (57°N, -25°W) by GS U-558 with the loss of all 65 crew and the survivor from SS Empire Heron (🇬🇧 United Kingdom).
 * MV Heenvliet (🇳🇱 Netherlands): The coast collided with SS Vestland (1916) (🇳🇴 Norway) in the Irish Sea off Strumble Head, Pembrokeshire, United Kingdom and sank.
 * SS Leningrad (1889) ( Soviet Union): World War II: The cargo ship was bombed and sunk at Yevpatoria by Luftwaffe aircraft.
 * SS Lingfield (1917) (🇬🇧 United Kingdom): The cargo ship collided with another vessel in the North Sea off the coast of Norfolk and sank.
 * SS Pass of Balmaha (1933) (🇬🇧 United Kingdom): World War II: Convoy Cultivate: The coastal tanker was torpedoed and sunk in the Mediterranean Sea (31.23333°N, 28.83333°W) by GS U-97 (1940) with the loss of all 20 crew.
 * SS Paula Faumbaum (🇩🇪 Germany): The cargo ship ran aground off Stockholm, Sweden and was wrecked.
 * SS Samos (1889) (🇬🇷 Greece): World War II: Convoy Cultivate: The cargo ship was torpedoed and sunk in the Mediterranean Sea (31.23333°N, 28.83333°W) by GS U-97 (1940) with the loss of 31 of her 34 crew. Survivors were rescued by HMS Cocker.
 * SS Vesteraalen (1890) (🇳🇴 Norway): World War II: The coaster was torpedoed and sunk in the Norwegian Sea off Nuvsvåg, Finnmark (70.33333°N, 22.5°W) by SOVIET SUBMARINE SC-402 with the loss of 59 of the 65 people on board.
 * SS W C Teagle (🇬🇧 United Kingdom): World War II: Convoy SC 48: The cargo ship was torpedoed and sunk in the Atlantic Ocean (approximately 57°N, -25°W) by GS U-558 with the loss of 30 of her 39 crew. Survivors were rescued by HMS Broadwater (H81).

18 October

 * SS Argun (1917) ( Soviet Union): World War II: The cargo ship was torpedoed and sunk in the Kola Inlet (69.5°N, 33.5°W) by GS U-132 (1941) . Survivors were rescued by SS Mgla ( Soviet Union).
 * HMS Assurance (W59) : The Assurance-class tug  ran aground in Lough Foyle, Northern Ireland and was a total loss.
 * HMS Broadwater (H81) : World War II: Convoy SC 48: The Clemson-class destroyer was torpedoed and sunk in the Atlantic Ocean south of Iceland by GS U-101 (1940) with the loss of 44 of her 101 crew. Also lost were the survivors from SS Empire Heron, SS W C Teagle (both 🇬🇧 United Kingdom) and  SS Erviken (1920) (🇳🇴 Norway). Survivors were rescued by HMT Angle (FY201)
 * SS Caterina (1920, Todd) ( undefined): World War II: The cargo ship was bombed and damaged in the Mediterranean Sea by British aircraft. She sank the next day 62 nmi north of Tripoli, Libya.
 * SS Empire Grebe (🇬🇧 United Kingdom: The coaster ran aground 2 nmi south of Hartland Point, Devon and was declared a constructive total loss.
 * SS Empire Ghyll (🇬🇧 United Kingdom): World War II: The collier struck a mine and sank in the Thames Estuary (51.68333°N, 1.31667°W) with the loss of seven crew.
 * MV Empire Grove (🇬🇧 United Kingdom): The coaster ran aground at Long Peak, 2 nmi south of Hartland Point, Devon and was declared a constructive total loss.
 * MV Laurent Meeus (🇧🇪 Belgium): The cargo ship was driven aground at Heysham, Lancashire, United Kingdom, during a storm. She was refloated on 24 October and towed to Birkenhead, Cheshire for repairs. Returned to service in February 1942.
 * SS Mahseer (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the Thames Estuary (51.68333°N, 1.31667°W). All crew were rescued.
 * MS Neptunia (1932) : The troopship was torpedoed and sunk in the Mediterranean Sea off Tripoli, Libya by HMS Upholder (P37).
 * Oceania : The troopship was torpedoed and sunk in the Mediterranean Sea off Tripoli by HMS Upholder (P37).
 * RT-8 Seld ( Soviet Union): World War II: The trawler was torpedoed and sunk in the Gorlo Strait by GS U-132 (1941).

19 October

 * SS Andromeda (1910) (🇩🇪 Germany): World War II: The coaster was sunk by enemy action in Kongsfjord, Norway.
 * SS Baron Kelvin (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea 100 nmi west of Tarifa, Andalusia, Spain by GS U-206 with the loss of 26 of her 42 crew. Survivors were rescued by HMS Duncan (D99)  and SS Urola (🇪🇸 Spain).
 * SS Campeche (🇲🇽 Mexico): The cargo liner caught fire at Mazatlán, Sinaloa. She was later scuttled off Azada Island.
 * MV Inverlee (🇬🇧 United Kingdom): World War II: The tanker was torpedoed and damaged in the Atlantic Ocean 240 nmi west south west of Cape Spartel, Morocco by GS U-204 with the loss of 21 of her 43 crew. Survivors were rescued by HMS Duncan (D99) and HMT Lady Hogarth . Inverlee sank later that day.
 * SS Lehigh (🇺🇸 United States): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean 75 nmi off Freetown, Sierra Leone (8.43333°N, -14.61667°W by GS U-126 (1940) . All 44 people on board were rescued, some of them by HMS Vimy (D33).
 * SS Rask (1890) (🇳🇴 Norway): World War II: The coaster was bombed and sunk in the North Sea (52.13333°N, -6.38333°W) by Luftwaffe aircraft with the loss of eight of her eighteen crew. Five of the survivors were rescued by SS Wallace Rose (🇬🇧 United Kingdom), the others reached land.
 * SS Tower Field (🇬🇧 United Kingdom): The cargo ship ran aground at Hull, Yorkshire and broke in two. Later salvaged, repaired and re-entered service as Empire Tower.
 * GS U-204 : World War II: The Type VIIC submarine was depth charged and sunk in the Strait of Gibraltar by HMS Mallow (K81) and HMS Rochester (both ) with the loss of all 46 crew.

20 October

 * ITALIAN TORPEDO BOAT Aldebaran : World War II: The Spica-class torpedo boat struck a mine and sank in the Gulf of Athens (37.36667°N, 23.86667°W).
 * ITALIAN TORPEDO BOAT Altair : World War II: The Spica-class torpedo boat struck a mine and was damaged in the Gulf of Athens (37.36667°N, 23.86667°W). She was taken in tow, but later sank.
 * SS British Mariner (🇬🇧 United Kingdom): World War II: The tanker was torpedoed and damaged in the Atlantic Ocean (7.71667°N, -14.33333°W) by GS U-126 (1940) with the loss of three of her 51 crew. She was abandoned by the survivors, who were rescued by HMS Hudson (W02) . British Mariner was towed to Freetown, Sierra Leone by ST Donau (🇳🇱 Netherlands) and HMS Hudson. She was declared a constructive total loss. Thereafter served as a hulk at Freetown until scrapped in 1951.
 * SS Indra (1900) (🇵🇦 Panama): The cargo ship departed from Bari, Apulia, Italy for Huelva, Andalusia, Spain. No further trace.
 * SS Kadio (🇬🇷 Greece): The cargo ship caught fire and sank at Suez, Egypt.
 * SS Tex-Africa (🇬🇧 United Kingdom): World War II: The tanker was torpedoed and damaged in the Atlantic Ocean off Sierral Leone by GS U-126 (1940) . She was subsequently used as a hulk.

21 October

 * HMS Gnat (T60) : World War II: The Insect-class gunboat was torpedoed and damaged in the Mediterranean Sea (32.13333°N, 25.36667°W) by GS U-79 (1941) (. She was declared a constructive total loss but was used as an anti aircraft platform at Alexandria, Egypt for the duration of the war. Scrapped in 1945.
 * ST Helen Barbara 🇬🇧 United Kingdom): World War II: The tug was abandoned in a storm and foundered.
 * SS Hilda (1925) (🇸🇪 Sweden): World War II: The cargo ship was bombed and sunk in the North Sea off IJmuiden, North Holland, Netherlands by Royal Air Force aircraft.
 * SS Johannes C Russ (🇩🇪 Germany): The cargo ship was wrecked off Umeå, Sweden. She was salvaged, repaired and returned to service.
 * SOVIET SUBMARINE M-58 : World War II: The M-class submarine struck a mine and sank in the Black Sea off the mouth of the Danube with the loss of all nineteen crew.
 * SS Serbino (🇬🇧 United Kingdom}: World War II: Convoy SL 89: The cargo ship was torpedoed and sunk in the Atlantic Ocean (51.16667°N, -19.33333°W) by GS U-82 (1941) with the loss of fourteen crew.
 * SS Treverbyn (🇬🇧 United Kingdom: World War II: Convoy SL 89: The cargo ship was torpedoed and sunk in the Atlantic Ocean (approximately 51°N, -19°W) by GS U-82 (1941).

22 October

 * HMT Alder : The naval trawler ran aground on the east coast of Scotland and was declared a total loss.
 * RFA Darkdale : World War II: The Dale-class oiler was torpedoed and sunk in the Atlantic Ocean at Jamestown, Saint Helena (-15.91667°N, -5.71667°W) by GS U-68 (1940) with the loss of 41 of her 49 crew.
 * SS Marigola ( undefined): World War II: The cargo ship was torpedoed and damaged in the Mediterranean Sea off Tunisia (35.83333°N, 11.1°W) by HMS Urge (. She was shelled and damaged further on 30 October 2.3 nmi off Kuriat Island by HMS Utmost (N19) . HMS Urge torpedoed and sunk her on 1 November.

23 October

 * SS Achille ( undefined): World War II: The cargo ship was bombed and sunk in the Mediterranean Sea (38.43333°N, 11.4°W) by British aircraft.
 * SS Baltenland (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk in the Baltic Sea by SOVIET SUBMARINE SC-323 (.
 * HMS Cossack (G03) : World War II: Convoy HG 75: The Tribal-class destroyer was torpedoed and damaged in the Atlantic Ocean (35.93333°N, -10.06667°W) by GS U-563 with the loss of 159 of her 219 crew . Survivors were rescued by HMS Carnation (K00) and HMS Legion (F74) (both ). She was taken in tow on 25 October by a HMS Thames (1938)  but the tow was slipped in stormy weather the next day. Cossack sank on 27 October (35.2°N, -8.28333°W).
 * Llanishan ( undefined): The 5,052 grt freighter was bombed and sunk SE of Wick at position 58.28333°N, -2.45°W
 * SS Maria Pompei (🇮🇹 Italy): World War II: The cargo ship struck a mine and sank in the Adriatic Sea 2 nmi off Punta Platamoni, Kotor, Yugoslavia.
 * Pangiotis (🇬🇷 Greece): World War II: The caïque was shelled and sunk in the Gulf of Petali by HMS Triumph (N18).
 * SS Virginia S (🇬🇷 Greece): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea (39.8°N, 19.1°W) by HMS Truant (N68).

24 October

 * SS Alhama (🇬🇧 United Kingdom): World War II: Convoy HG 75: The cargo ship was torpedoed and sunk in the Atlantic Ocean (35.7°N, -10.96667°W) by GS U-564 (. All 33 crew were rescued by FRENCH MINESWEEPER Commandant Duboc, HMS Hesperus (H57), HMS Lamerton (L88) and HMS Rochester (L50) (all ).
 * SS Ariosto (🇬🇧 United Kingdom): World War II: Convoy HG 75: The cargo ship was torpedoed and sunk in the Atlantic Ocean 300 nmi west of Gibraltar (36.33333°N, -10.83333°W) by GS U-564 ( with the loss of six of her 51 crew. Survivors were rescued by HMS Lamerton (L88) and MV Pacific (1914) (🇸🇪 Sweden).
 * SS Carsbreck (🇬🇧 United Kingdom): World War II: Convoy HG 75: The cargo ship was torpedoed and sunk in the Atlantic Ocean 300 nmi west of Gibraltar (36.33333°N, -10.83333°W) by GS U-564 ( with the loss of 23 of her 42 crew. Survivors were rescued by FRENCH MINESWEEPER Commandant Duboc.
 * HMT Emilion : World War II: The naval trawler struck a mine in the Thames Estuary off Essex and was sunk without loss of life. The wreck was subsequently blown up as it was considered a danger to navigation.
 * SS Empire Guillemot (1919) (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea west of La Galita, Tunisia by Regia Aeronautica aircraft with the loss of eleven of her 44 crew. Survivors were taken as prisoners of war.
 * HMT Lucienne Jeanne : World War II: The naval trawler struck a mine and sank in the Thames Estuary.

25 October

 * SS Albert H Willis (🇨🇦 Canada): The coaster ran aground off Freeport and was wrecked.
 * ITALIAN SUBMARINE Galileo Ferraris : World War II: The Archimede-class submarine was bombed and damaged west of Gibraltar by a Consolidated PBY Catalina aircraft of the Royal Air Force. HMS Lamerton (L88) was sent to intercept, but Galileo Ferraris was scuttled by her crew. Forty-four survivors were rescued.
 * HMS Latona (M76) : World War II: The Abdiel-class minelayer was bombed and sunk in the Mediterranean Sea (32.25°N, 24.23333°W) by Junkers Ju 87 aircraft of 1 Staffeln, StG1, Luftwaffe. With the loss of sixteen of her 242 crew and seven of the 1,000 Polish soldiers on board.
 * SS Monrosa ( undefined): World War II: The cargo ship was torpedoed and sunk in the Aegean Sea (37.68333°N, 23.88333°W) by HMS Triumph (N18).

26 October

 * HMS Ariguani (F105) : World War II: Convoy HG 75: The fighter catapult ship was torpedoed and damaged in the Atlantic Ocean (37.83333°N, -16.16667°W) by GS U-83 (1941) with the loss of two crew and was abandoned. She was later reboarded and towed to Gibraltar by HMS Rollicker (W00) and HMS Thames (1938) (both ). She was decommissioned and laid up. She was later repaired and returned to merchant service in January 1944.
 * English Trader'' (🇬🇧 United Kingdom: World War II: Convoy EC 90: The cargo ship ran aground in the North Sea on Hammond Knoll off Cromer, Norfolk with the loss of three of her 47 crew. Survivors were taken off by CROMER LIFEBOAT H F Bailey III (RNLI FLAG.png Royal National Lifeboat Institution). One lifeboatman was lost in the rescue.
 * SS Herta Engeline Fritzen (🇩🇪 Germany): The cargo ship ran aground at Hoek van Holland, South Holland, Netherlands and was wrecked.

27 October

 * SS Antiope (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and sunk in the North Sea (53.17917°N, 1.1°W) by Luftwaffe aircraft with the loss of one crew member.
 * MV Delegat ( Soviet Union): World War II: The coaster was bombed and sunk in the Black Sea off Kerch.
 * SS Friesland (1930) (🇳🇱 Netherlands): World War II: The cargo ship was bombed and sunk in the North Sea (53.06667°N, 1.58333°W) by Luftwaffe aircraft.
 * SS Gunlog (🇸🇪 Sweden): World War II: The cargo ship was bombed and sunk in the North Sea off Den Helder, North Holland by Royal Air Force aircraft.
 * HMS Tetrarch (N77) : World War II: The T-class submarine communicated with HMS Ultimatum (P34) in the Mediterranean Sea. No further trace.
 * SS Walnut (🇬🇧 United Kingdom): The cargo ship departed from Liverpool, Lancashire for Newry, Co Down. No further trace, lost with all nine crew.

28 October

 * SS Esperia ( undefined): World War II: The cargo ship was shelled and sunk in the Mediterranean Sea north east of Benghazi, Libya by HMS Thrasher (N37).
 * SS Hazelside (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean (-23.16667°N, 1.6°W) by GS U-68 (1941) with the loss of two of her 46 crew. Survivors were rescued by MV Malayan Prince (🇬🇧 United Kingdom)
 * MV King Malcolm (🇬🇧 United Kingdom): World War II: Convoy SC 50: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean by GS U-106 (1940) with the loss of all 38 crew.
 * SS Roslea (🇬🇧 United Kingdom): World War II: The coaster ran aground on the Belgian coast in a storm. She was captured the next day by German forces and the crew were taken as prisoners of war. Subsequently refloated and entered German service.
 * GERMAN PATROL VESSEL V-309 : World War II: The vorpostenboot struck a mine in the Baltic Sea off Ventspils, Latvia and sank.
 * SS Ulea (🇬🇧 United Kingdom): World War II: Convoy HG 75: The cargo ship was torpedoed and sunk in the Atlantic Ocean (41.28333°N, -21.66667°W) by GS U-432 ( with the loss of nineteen of the 28 people on board. Survivors were rescued by HMS Bluebell (K80) and HMCS La Malouine (K80).

29 October

 * SS Barcelona (1921) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk in the Norwegian Sea off Ålesund, Møre og Romsdal, Norway by Royal Air Force aircraft.
 * HMT Flotta : World War II: The naval trawler ran aground off Buchan Ness, Aberdeenshire. She foundered on 6 November.
 * MO-206 : World War II: The MO-4-class patrol boat was bombed and sunk in the Baltic Sea off the Shepelevski Lighthouse, near Leningrad.
 * SS Sarastone (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and sunk in the Atlantic Ocean (37.08611°N, -6.80833°W) by Luftwaffe aircraft with the loss of one crew member.
 * SS Uralles ( Soviet Union): World War II: The cargo ship was bombed and sunk in the Black Sea off Yevpatoria by Luftwaffe aircraft.

30 October

 * SOVIET SUBMARINE Kalev : World War II: The Kalev-class submarine struck a mine and sank in the Gulf of Finland off Hanko, Finland
 * SS Solskin (1926) (🇳🇴 Norway): World War II: The coaster was bombed and sunk west of Eigerøya, Rogaland by Royal Air Force aircraft with the loss of one crew member.

31 October

 * SS Bennekom (🇳🇱 Netherlands): World War II: Convoy OS 10: The cargo ship was torpedoed and sunk in the Atlantic Ocean (51.33333°N, -23.66667°W) by GS U-96 (1940) ( with the loss of eight of her 54 crew. Survivors were rescued by HMS Culver (Y87).
 * SS British Fortune (🇬🇧 United Kingdom): World War II: The tanker was bombed and sunk in the North Sea 1 nmi off Aldeburgh, Suffolk by Luftwaffe aircraft.
 * SS Empire Guidon (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Indian Ocean (-30.16667°N, 33.83333°W) by GS U-504.
 * SS Meteor (1925) ( undefined): World War II: The tanker was torpedoed and sunk in the Adriatic Sea south of Ortona, Abruzzo by HMS Truant (N68).
 * SS Nicolaos Piangos (🇬🇷 Greece): World War II: The cargo ship was bombed and sunk in the North Sea (51.97917°N, 1.625°W) by Luftwaffe aircraft.
 * USS Reuben James : World War II: Convoy HX 156: The Clemson-class destroyer was torpedoed and sunk in the Atlantic Ocean off Iceland by GS U-552 with the loss of 115 of her 159 crew. Survivors were rescued by USS Hilary P. Jones (DD-427) and USS Niblack (DD-424) (both ).
 * SS Rose Schiaffino (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean 225 nmi east of St. John's, Newfoundland (approximately 48°N, -50°W) by GS U-374 with the loss of all 41 crew.

Unknown Date

 * SOVIET SUBMARINE Shch-322 : World War II: The Shchuka-class submarine was lost in the Baltic Sea on or after 11 October with the loss of all hands.