List of shipwrecks in October 1940

The list of shipwrecks in October 1940 includes all ships sunk, foundered, grounded, or otherwise lost during October 1940. Most of the ships listed here were lost in connection with World War II.

1 October
For the loss of SS Haulerwijk on the day, see the entry for 30 September 1940
 * SS Aghios Nicolaos (🇬🇷 Greece): World War II: The cargo ship was shelled and sunk in the Atlantic Ocean 300 nmi off Lisbon, Portugal (40°N, -16.91667°W) by ITALIAN SUBMARINE Maggione Francesco Baracca.
 * MV Highland Patriot (🇬🇧 United Kingdom): World War II: The cargo liner was torpedoed and sunk in the Atlantic Ocean west of Ireland (52.33333°N, -19.06667°W) by GS U-38 (1938) with the loss of three of the 172 people on board. Survivors were rescued by HMS Wellington (L65)

2 October

 * Berillo : World War II: The Perla-class submarine was attacked in the Mediterranean Sea off Sidi Barrani, Egypt (33.15°N, 26.4°W) by HMS Hasty (H24) and HMS Havock (H43) (both ) and was scuttled by her crew.
 * SS Kayeson (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of Ireland (51.2°N, -24.36667°W) by GS U-32 (1937) . All 38 crew took to the lifeboats but were not seen again.
 * SS Latymer (🇬🇧 United Kingdom): World War II: Convoy HG 44: The cargo ship was bombed and sunk in the Atlantic Ocean (4 nmi west of the Skellig Islands, County Kerry, Ireland (51.33333°N, -10.5°W) by Luftwaffe aircraft.

3 October

 * MV Actuosity (🇬🇧 United Kingdom: The coaster foundered off the coast of Norfolk.
 * ST Aid (🇬🇧 United Kingdom): World War II: The tug struck a mine off Killigerran Head near Falmouth, Cornwall and sank.
 * HMS Lady of the Isles (N16) : World War II: The cable layer struck a mine 3 nmi east of St Anthony Point, Cornwall (50.16667°N, -4.4°W) and sank with the loss of sixteen crew.
 * ST Lauwerzee (🇳🇱 Netherlands): World War II: The tug struck a mine 3 nmi east of St Anthony Point, Cornwall (50.16667°N, -4.4°W) and sank with the loss of twelve crew.

4 October

 * SS Franca Fassio ( undefined): World War II: The passenger ship was torpedoed and sunk in the Gulf of Genoa 16 nmi off Capo Noli, Liguria by HMS Triton (N15).
 * SS Nina Bianchi ( undefined): The cargo ship collided with SS Veloce ( undefined) in the Adriatic Sea off San Cataldo di Lecce, Apula (40.45°N, 18.4°W) and sank.
 * HMS Rainbow (N16) : World War II: The Rainbow-class submarine was rammed and sunk in the Adriatic Sea off Bari, Italy (41.46667°N, 18.08333°W) by SS Antonietta Costa ( undefined).
 * ST Sirdar (🇬🇧 United Kingdom): World War II: The tug was bombed and sunk in The Swale, Kent by Luftwaffe aircraft.

5 October

 * SS Adaptity (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank in the Thames Estuary (51.73333°N, 1.28333°W) with the loss of one crew member.
 * HMT Kingston Sapphire : World War II: The naval trawler was torpedoed and sunk in the Atlantic Ocean 20 nmi south of Cadiz, Spain (36.18333°N, -6.53333°W) by ITALIAN SUBMARINE Nani with the loss of three crew. The survivors were rescued by a Spanish trawler.
 * SS Maria Grazia ( undefined): World War II: The coaster was rammed and sunk in the Mediterranean Sea (41.08333°N, 17.75°W) by HMS Regent (N41).
 * SS Ottoland (🇳🇱 Netherlands): World War II: The collier struck a mine and sank in the North Sea off Sunderland, Co Durham, United Kingdom. All crew were rescued.

6 October

 * SS Benlawers (🇬🇧 United Kingdom): World War II: Convoy OB 221: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of Ireland (52.33333°N, -26.16667°W) by GS U-123 (1940) with the loss of 24 of her 51 crew. Survivors were rescued by SS Bengore Head and SS Forest (both 🇬🇧 United Kingdom).
 * SS British General (🇬🇧 United Kingdom): World War II: The tanker was torpedoed and damaged in the Atlantic Ocean west of Ireland (51.7°N, -24.05°W) by GS U-37 (1938) . U-47 sank her the next day with the loss of all 47 crew.
 * Gemma : World War II: The Perla-class submarine was torpedoed and sunk in the Mediterranean Sea east of Crete (35.5°N, 27.3°W) by 'Tricheo'.
 * SS Jersey Queen (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank in the English Channel off Falmouth, Cornwall with the loss of two crew.
 * MV Nina Borthen (1930) (🇳🇴 Norway): World War II: The tanker was torpedoed and sunk in the Atlantic Ocean west of Ireland ( 54°N, -26°W) by GS U-103 (1940) with the loss of all 35 crew.
 * HMS Poulmic : World War II: The auxiliary minesweeper struck a mine and sank in the English Channel off Penlee Point, Rame, Cornwall.
 * SS Vido ( undefined): World War II: The cargo ship struck a mine in the Black Sea 9.7 nmi east of Sulina, Tulcea County, Romania and was beached.

7 October

 * MV Touraine (1925) (🇳🇴 Norway): World War II: Convoy OB 224: The cargo ship was torpedoed and sunk in the Atlantic Ocean (55.2°N, -10.3°W by GS U-59 (1939) . Some of the 35 crew were rescued by HMS Derbyshire (N90), others reached land in their lifeboats.

8 October

 * SS Bellona II : World War II: The coaster was bombed and damaged in the North Sea 4 nmi off Gordoun, Kincardineshire by Luftwaffe aircraft. She drifted ashore at Streathlethan Bay, Aberdeenshire and was declared a constructive total loss. Nine of the 27 people on board were killed.
 * HMS Borealis : World War II: The barrage balloon vessel was bombed and sunk in the English Channel south of the Isle of Wight by Luftwaffe aircraft.
 * SS Confield (🇬🇧 United Kingdom): World War II: Convoy HX 76: The cargo ship straggled behind the convoy due to her cargo shifting. She was torpedoed and damaged in the Atlantic Ocean west of the Outer Hebrides (56.8°N, -10.28333°W) by GS U-58 (1939) with the loss of one of her 37 crew. Survivors were rescued by HMS Periwinkle (K55) and HMS Weston (L72) (both ), the latter of which scuttled Confield.
 * Hecht (🇩🇪 Germany): World War II: The trawler was sunk by enemy action.
 * SS Natia (🇬🇧 United Kingdom): World War II: The cargo ship was shelled and sunk in the South Atlantic (0.73333°N, -32.2°W) by GERMAN AUXILIARY CRUISER Thor with the loss of two of her 86 crew. The survivors were made prisoners of war.

9 October

 * SS Alderney Queen (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and sunk in the Bristol Channel off Grassholm, Pembrokeshire (51.64167°N, -5.425°W by Luftwaffe aircraft. All crew were rescued.
 * SS Antonietta Costa ( Kingdom of Italy): World War II: The cargo ship was torpedoed and sunk in the Adriatic Sea off Durrës, Albania (41.28333°N, 19.41667°W) by HMS Regent (N41).
 * SS Delphin (1906) (🇬🇷 Greece): World War II: Convoy SC 6: The cargo ship was torpedoed and damaged in the Atlantic Ocean west of Ireland (58.18333°N, -13.95°W) by GS U-103 (1940) . She sank the next day at 57.76667°N, -13.83333°W' All crew were rescued.
 * SS Graigwen (1925) (🇬🇧 United Kingdom): World War II: Convoy SC 6: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean west of the Outer Hebrides, United Kingdom (58.18333°N, -13.95°W) by GS U-103 (1940)) with the loss of seven of her 37 crew. She was torpedoed and sunk again the next day by GS U-123 (1940) . Survivors were rescued by HMS Enchantress (L56).
 * SS Rochdale (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk.
 * HMT Sea King : World War II: The naval trawler struck a mine in the Humber Estuary and sank with the loss of all fourteen crew.
 * SS Zannes Gounaris (🇬🇷 Greece): World War II: Convoy SC 6: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (58.18333°N, -13.95°W) by GS U-123 (1940) with the loss of seven of her 34 crew.

10 October

 * HMT Girl Mary : World War II: The auxiliary patrol vessel struck a mine and sank in the Firth of Forth 4 nmi off Inchcolm with the loss of two crew.
 * Nordenham (🇩🇪 Germany): World War II: The trawler was torpedoed and sunk in the English Channel off Calais, Pas-de-Calais by MTB 22, MTB 31 and MTB 32 (all ). Thirty-four people were taken as prisoners of war.

11 October

 * HMY Aisha : World War II: The naval yacht struck a mine and sank in the Thames Estuary off the Isle of Sheppey, Kent.
 * MV Brandanger (1926) (🇳🇴 Norway): World War II: Convoy HX 77: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Hebrides, United Kingdom (57.16667°N, -17°W by GS U-48 (1938) with the loss of six of her 30 crew. Survivor were rescued by SS Clan Macdonald (1928) (🇬🇧 United Kingdom and HMS Clarkia (K88).
 * SS Davanger (1921) (🇳🇴 Norway): World War II: Convoy HX 77: The tanker was torpedoed and sunk in the Atlantic Ocean 300 nmi west of Broadhaven Bay, County Mayo, Ireland (57°N, -19.16667°W) by GS U-48 (1939) with the loss of eighteen of her 30 crew.
 * HMT L'Istrac : World War II: The naval trawler was torpedoed and sunk in the English Channel off the Isle of Wight (50.41667°N, -1.83333°W) by GERMAN TORPEDO BOAT Greif ( with the loss of twelve of her 36 crew.
 * Llanfair ( undefined): The 4,996 grt freighter was torpedoed by GS U-38 (1938) at position 54.8°N, -13.76667°W.
 * MV Port Gisborne (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (56.63333°N, -16.66667°W) by GS U-48 (1938) with the loss of 26 of her 64 crew. Survivors were rescued by ST Salvona (🇬🇧 United Kingdom).
 * HMT Warwick Deeping : World War II: The naval trawler was shelled and sunk in the English Channel off the Isle of Wight (50.41667°N, -1.83333°W) by GERMAN TORPEDO BOAT Falke and GERMAN TORPEDO BOAT Kondor (both.

12 October

 * Ariel : World War II: Battle of Cape Passero: The Spica-class torpedo boat was shelled and sunk in the Ionian Sea (35.61667°N, 16.7°W) by HMS Ajax (22).
 * Airone : World War II: Battle of Cape Passero: The Spica-class torpedo boat was shelled and sunk in the Ionian Sea (35.61667°N, 16.7°W) by HMS Ajax (22).
 * Artigliere : World War II: Battle of Cape Passero: The Soldati-class destroyer was shelled and severely damaged in the Ionian Sea by HMS Ajax (22) and then shelled and sunk at 35.78333°N, 16.41667°W by HMS York (90).
 * FRENCH SUBMARINE CHASER Chasseur 6 : World War II: The naval trawler was torpedoed and sunk by GERMAN TORPEDO BOAT Greif with the loss of eight of her nineteen crew. The survivors were rescued by Greif and made prisoners of war.
 * FRENCH SUBMARINE CHASER Chasseur 7 : World War II: The naval trawler was torpedoed and sunk by GERMAN TORPEDO BOAT Greif with the loss of twelve of her nineteen crew. The survivors were rescued by Greif and made prisoners of war.
 * SS Davanger (1921) (🇳🇴 Norway): World War II: Convoy HX 77: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides, United Kingdom (57°N, -19.16667°W) by GS U-48 (1939) with the loss of seventeen of her 29 crew.
 * SS Orao ( undefined): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of Gibraltar (35.56667°N, -10.58333°W) by ITALIAN SUBMARINE Enrico Tazzoli with the loss of two crew.
 * MV Pacific Ranger (🇬🇧 United Kingdom): World War II: Convoy HX 77: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of County Donegal, Ireland (56.33333°N, -11.71667°W) by GS U-59 (1939) . All 53 crew survived. Some were rescued by one of the escorting ship, others by the trawler Þormóður (Light Blue Flag of Iceland.svg Iceland) and some made land in their lifeboat.
 * HMT Resolvo : World War II: The naval trawler struck a mine in the Thames Estuary north east of Sheerness, Kent and was severely damaged. All crew were rescued by HMT Peter Carey . Resolvo was beached the next day at Sheerness and abandoned.
 * GERMAN TORPEDO BOAT S-37 : World War II: The schnellboot struck a mine and sank in the North Sea east of Orfordness, Suffolk, United Kingdom.
 * SS Saint Malô (🇨🇦 Canada): World War II: Convoy HX 77: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides, United Kingdom (57.96667°N, -16.53333°W) by GS U-101 (1940) with the loss of 28 of her 44 crew. Survivors were rescued by HMS Salvonia (W43).

13 October

 * Cargo Fleet No.2 (🇬🇧 United Kingdom): World War II: The hopper barge struck a mine and was damaged off the mouth of the Tees. She was declared a total loss.
 * HMS Danube III : World War II: The tug struck a mine and sank in the Thames Estuary north east of Sheerness, Kent.
 * Gnom 7 : World War II: The Aux. Minesweeper struck a mine and sank in the North Sea at 56.43333°N, 5.16667°W.
 * Kobold 1 : World War II: The Aux. Minesweeper struck a mine and sank in the North Sea at 56.43333°N, 5.16667°W.
 * Kobold 3 : World War II: The Aux. Minesweeper struck a mine and sank in the North Sea at 56.43333°N, 5.16667°W.
 * SS Nora (1902) (🇪🇪 Estonia): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides, United Kingdom (57.03333°N, -13.18333°W) by GS U-103 (1940) . Nineteen survivors were rescued by HMS Leith (U36) ,
 * SS Stangrant (🇬🇧 United Kingdom): World War II: Convoy HX 77: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (58.45°N, -12.6°W) by GS U-37 (1938) ( with the loss of eight of her 38 crew. Survivors were rescued by a Short Sunderland aircraft of 10 Squadron, Royal Australian Air Force.
 * HMT Summer Rose : World War II: The naval trawler struck a mine and sank in the North Sea off Sunderland, Co Durham.

14 October

 * HMS Cheshire (F18) : World War II: The armed merchant cruiser was torpedoed and damaged in the Atlantic Ocean north west of Ireland (55.21667°N, -13.03333°W) by GS U-137 (1940) . Two hundred and twenty crew were rescued by HMS Periwinkle (K55) and HMCS Skeena (D59) . HMS Cheshire was towed to Belfast Lough and beached. Later repaired and returned to service.
 * SS Euler (🇩🇪 Germany): World War II: The cargo ship struck a mine and sank in the Bay of Biscay off Saint-Nazaire, Loire-Atlantique.
 * GERMAN NETLAYER Genua : World War II: The netlayer was torpedoed and sunk at Egersund, Norway by HMS Cossack (F03) with the loss of 78 crew. Raised, repaired, returned to service.
 * SS Glynwen (🇬🇧 United Kingdom): World War II: The collier was sunk by enemy action.
 * HMT Lord Stamp (: World War II: The naval trawler struck a mine in the English Channel 17 nmi off Portland Bill, Dorset and sank with the loss of 23 crew.
 * MV Reculver (🇬🇧 United Kingdom): World War II: The pilot vessel struck a mine and sank in the Humber Estuary south of Spurn Point, Yorkshire. All 31 crew were rescued.

15 October

 * SS Bellavale (1905) (🇬🇧 United Kingdom): The collier was driven ashore in a storm at St John's Point, Rossglass, County Down and was wrecked.
 * SS Bonheur (🇬🇧 United Kingdom): World War II: Convoy OB 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.16667°N, -8.6°W) by GS U-138 (1940) . All 39 crew were rescued by HMT Sphene (FY249) ).
 * Foca : World War II: The Foca-class submarine struck a mine and sank in the Mediterranean Sea off Haifa, Palestine.
 * SS Huruni (🇬🇧 United Kingdom): World War II: Convoy OB 227: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of the Outer Hebrides (58.96667°N, -9.9°W) by GS U-93 (1940) with the loss of two of her 75 crew. Survivors were rescued by SS St Margaret (1936) (🇬🇧 United Kingdom) and transferred to HMS Fowey (L15).
 * SS Kabalo (🇧🇪 Belgium): World War II: The cargo ship was shelled and sunk in the Atlantic Ocean off the Azores, Portugal (31.98333°N, -31.33333°W) by ITALIAN SUBMARINE Comandante Alfredo Cappelini with the loss of one crew member. Survivors were rescued by SS Pan American (🇺🇸 United States).
 * HMT Mistletoe : World War II: The river patrol vessel struck a mine and sank in the Humber Estuary south of Spurn Point, Yorkshire. with the loss of four of her six crew.
 * MV Ringwood (1926) (🇳🇴 Norway): World War II: The cargo ship was captured in the Pacific Ocean north of Australia (5.48333°N, 159.7°W) by GERMAN AUXILIARY CRUISER Orion ( and scuttled. All crew were rescued and repatriated to Norway.
 * SS Thistlegarth (🇬🇧 United Kingdom): World War II: Convoy OB 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean north west of the Outer Hebrides (58.56667°N, -15°W) by GS U-103 (1940) with the loss of 30 of her 39 crew. Survivors were rescued by HMS Heartsease (K15).
 * HMS Triad (N53) : World War II: The T-class submarine was shelled and sunk in the Gulf of Taranto 50 nmi south of Cape Collonne (38.25°N, 17.61667°W) by Enrico Toti with the loss of all 59 crew.

16 October

 * HMS Ashanti (F51) : World War II: The Tribal-class destroyer ran aground off Sunderland, Co Durham (54.78472°N, -1.35°W) and was severely damaged. She was refloated on 1 November, repaired and returned to service in June 1941.
 * MV Cimcour (🇫🇷 France): World War II: The coaster was torpedoed and sunk in the Bay of Biscay (45.73333°N, -3.75°W) by HMS Tigris (N63).
 * HMS Dundalk : World War II: The Hunt-class minesweeper struck a mine in the North Sea off Harwich, Essex (51.95°N, 1.45°W) and was damaged. She was taken under tow by HMS Sutton ( but foundered the next day with the loss of four crew.
 * HMS Fame (H78) : World War II: The F-class destroyer ran aground off Sunderland, Co Durham (54.78472°N, -1.35°W) and was severely damaged. She was refloated on 1 December, repaired and returned to service in September 1942.
 * MV Languedoc (🇬🇧 United Kingdom): World War II: Convoy SC 7: The tanker was torpedoed and damaged in the Atlantic Ocean by GS U-48 (1939) and was subsequently scuttled by HMS Bluebell (K80).
 * SS Marly (🇳🇴 Norway): The cargo ship foundered in the Indian Ocean with the loss of all hands. Her last reported position was 18.5°N, 72.35°W.
 * MTB 106 : World War II: The motor torpedo boat struck a mine and sank in the Thames Estuary north of Sheerness, Kent.
 * Pride (🇬🇧 United Kingdom): World War II: The fishing vessel struck a mine and sank in the North Sea off Scarborough, Yorkshire with the loss of all four crew.
 * SS Trevisa (🇨🇦 Canada): World War II: Convoy SC 7: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean (57.46667°N, -20.5°W) by GS U-124 (1940) with the loss of seven of her 21 crew. Survivors were rescued by HMS Bluebell (K80).
 * SS Verace ( undefined): World War II: The cargo ship struck a mine and sank in the Mediterranean Sea off Benghazi, Libya.

17 October

 * SS Aenos (1910) (🇬🇷 Greece): World War II: Convoy SC 7: The cargo ship was shelled and sunk in the Atlantic Ocean by GS U-39 (1938) with the loss of four of her 29 crew. Survivors were rescued by SS Eaglescliffe Hall (🇬🇧 United Kingdom).
 * Albatross (🇬🇧 United Kingdom): World War II: The fishing vessel struck a mine and sank in the North Sea off Grimsby, Lincolnshire. Five crew survived.
 * Cheerful (🇫🇴 Faroe Islands): World War II: The trawler struck a mine and sank in the Atlantic Ocean off the Faroe Islands.
 * SS Dokka (1925) (🇳🇴 Norway): World War II: Convoy OB 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean south of Iceland (60.76667°N, -16.5°W) by GS U-93 (1940) with the loss of ten of her seventeen crew. Survivors were rescued by HMS Folkestone (L22).
 * SS Frankrig (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea off Orford Ness, Suffolk (52.05°N, 1.8°W). Nineteen crew were rescued by HMS Holderness (L48).
 * SS Hauxley (🇬🇧 United Kingdom): World War II: Convoy FN 311: The cargo ship was torpedoed and damaged in the North Sea 6 nmi off Cromer, Norfolk by GERMAN TORPEDO BOAT S-18 with the loss of one crew member. She was taken in tow by HMS Worcester (D96)  but sank the next day at 50.05°N, 1.59167°W.
 *  Janna A (flag unknown): World War II: The sailing ship struck a mine and sank in the Oosterschelde, Zeeland, Netherlands.
 * HMT Kingston Cairngorm : World War II: The naval trawler struck a mine in the English Channel south of the Isle of Portland, Dorset. She was taken in two but sank the next day.
 * MV Languedoc (🇬🇧 United Kingdom): World War II: Convoy SC 7: The tanker was torpedoed and damaged in the Atlantic Ocean (59.23333°N, -17.85°W) by GS U-48 (1939) . All 41 crew were rescued, most of them by HMS Bluebell (K80) . The ship was declared beyond salvage and was scuttled by HMS Bluebell.
 * SS Scoresby (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (59.23333°N, -17.85°W) by GS U-48 (1939).
 * SS Uskbridge (🇬🇧 United Kingdom): World War II: Convoy OB 228: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (60.66667°N, -15.83333°W) by GS U-93 (1940) with the loss of two of her 29 crew. Survivors were rescued by SS Katwijk (🇳🇱 Netherlands) and SS Montreal City (🇬🇧 United Kingdom).

18 October

 * SS Beatus (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.51667°N, -13.16667°W) by GS U-46 (1939) The 37 crew were rescued by HMS Bluebell (K80) (.
 * SS Boekelo (🇳🇱 Netherlands): World War II: Convoy SC 7: The cargo ship straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean (57.23333°N, -10.63333°W) by GS U-100 (1940) . She was torpedoed and sunk in the early hours of the next day by GS U-123 (1940) . All 25 crew were rescued by HMS Fowey (L15).
 * HMCS Bras d'Or : The auxiliary minesweeper sank in the Gulf of St Lawrence with the loss of all 29 crew.
 * SS Convallaria (🇸🇪 Sweden): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides, United Kingdom (57.33333°N, -10.66667°W) by GS U-46 (1939) . All crew were rescued by HMS Fowey (L15).
 * SS Creekirk (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57.5°N, -11.16667°W) by GS U-101 (1940) with the loss of all 36 crew.
 * SS Cuma ( undefined): World War II: The cargo ship struck a mine and sank in the Mediterranean Sea off the south west coast of Sicily (37.03056°N, 14.10333°W).
 *  Director II (🇺🇸 United States): The schooner ran aground off Gladstone, Queensland, Australia and was wrecked.
 * Durbo : World War II: The Adua-class submarine was depth charged and sunk in the Mediterranean Sea east of Gibraltar (34.9°N, -4.28333°W by two Saunders-Roe London flying boats of 202 Squadron, Royal Air Force, and HMS Firedrake (H79) and HMS Wrestler (D35) (both ).
 * SS Empire Miniver (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean by GS U-99 (1940) with the loss of three of her 38 crew. The survivors were rescued by HMS Bluebell (K80).
 * SS Fiscus (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.48333°N, -11.16667°W) by GS U-99 (1940) with the loss of 38 of her 39 crew. The survivor was rescued by HMS Clematis (K36).
 * SS Gunborg (🇸🇪 Sweden): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean 150 nmi west of the Outer Hebrides (57.23333°N, -11°W) by GS U-46 (1938) . All 23 crew were rescued by HMS Bluebell (K80).
 * HMS H49 : World War II: The H-class submarine was depth charged and sunk in the North Sea off Texel, Netherlands by GERMAN SUBMARINE CHASER UJ 116 and GERMAN SUBMARINE CHASER UJ 118 (both ) with the loss of 21 of her 22 crew.
 * SS Ipanemaloide (🇧🇷 Brazil): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea south of Sicily, Italy (37.03333°N, 14.13333°W).
 * SS Niritos (🇬🇷 Greece): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57.23333°N, -10.63333°W) by GS U-99 (1940) with the loss of one of her 28 crew. Survivors were rescued by HMS Bluebell (K80).
 * SS Sandsend (🇬🇧 United Kingdom): World War II: Convoy OB 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean 300 nmi west north west of Rockall, Inverness-shire (58.2°N, -21.48333°W) by GS U-38 (1938) with the loss of five of her 39 crew. Survivors were rescued by HMS Hibiscus (H24).
 * SS Skekatika (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship romped ahead of the convoy. She was torpedoed and damaged 90 nmi east south east of Rockall (57.2°N, -11.13333°W) by GS U-123 (1940). GS U-100 (1940) fired a coup de grâce which did not sink her. The next day, U-123 fired another torpedo which sank her at that location. All 36 crew were rescued by HMS Fowey (L15).

19 October

 * MV Aridity (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank in the Thames Estuary near the Oaze Lightship (🇬🇧 United Kingdom), north east of the Isle of Sheppey, Kent.
 * SS Assyrian (1914) (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean 57.2°N, -10.71667°W) by GS U-101 (1940) with the loss of seventeen of the 51 people on board. The survivors were rescued by HMS Leith (U36).
 * SS Bilderdyk (🇳🇱 Netherlands): World War II: Convoy HX 79: The cargo ship was torpedoed and sunk in the Atlantic Ocean (56.58333°N, -17.25°W) by GS U-47 (1938) . All 39 crew were rescued by HMS Jason (J39).
 * HMCS Bras d'Or : World War II: The Minesweeper sank in the Gulf of St. Lawrence with the loss of 30 of her crew.
 * SS Clintonia (1917) (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship straggled behind the convoy. She was torpedoed and damaged west of the Outer Hebrides (57.16667°N, -11.33333°W) by GS U-99 (1940) She was then shelled and sunk by GS U-123 (1940) with the loss of one of her 35 crew.
 * SS Empire Brigade (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.2°N, -10.71667°W) by GS U-99 (1940) with the loss of six of her 41 crew. Survivors were rescued by HMS Fowey (L15) (.
 * SS Ipanemaloide (🇧🇷 Brazil): World War II: The cargo ship was torpedoed and sunk in the Mediterranean Sea off the south coast of Sicily, Italy (37.03333°N, 14.13333°W).
 * SS Matheran (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Hebrides (57°N, -17°W) by GS U-38 (1938) with the loss of nine of her 81 crew. Survivors were rescued by SS Loch Lomond (🇬🇧 United Kingdom).
 * SS Ruperra (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship was torpoedoed and sunk in the Atlantic Ocean 90 nmi south west of Rockall, Inverness-shire (57°N, -16°W) by GS U-46 (1938) ( with the loss of 30 of her 36 crew. The survivors were rescued by SS Induna (🇬🇧 United Kingdom).
 * SS Sedgepool (🇬🇧 United Kingdom): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57.33333°N, -11.36667°W) by GS U-123 (1940) with the loss of three of her 39 crew. Survivors were rescued by HMS Salvonia (W43).
 * SS Shirak (🇬🇧 United Kingdom): World War II: Convoy HX 79: The tanker straggled behind the convoy. She was torpedoed and damaged in the Atlantic Ocean 90 nmi south west of Rockall (57°N, -16.88333°W) by GS U-47 (1938) . She was then torpedoed and sunk in the early hours of the next day by GS U-48 (1939) . All 37 crew were rescued by HMT Blackfly (FY 1173).
 * SS Snefjeld (🇳🇴 Norway): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.46667°N, -11.16667°W) by GS U-99 (1940) . All crew were rescued.
 * SS Soesterberg (🇳🇱 Netherlands): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean (57.2°N, -10.71667°W) by GS U-101 (1940) with the loss of six of her 25 crew. The survivors were rescued by HMS Leith (U36).
 * SS Thalia (🇬🇷 Greece): World War II: Convoy SC 7: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57°N, -11.5°W) by GS U-99 (1940) with the loss of 22 of her 26 crew.
 * SS Uganda (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (56.61667°N, -17.25°W) by GS U-38 (1938) . All 40 crew were rescued by HMS Jason (J99).
 * HMT Velia : World War II: The naval trawler struck a mine and sank in the North Sea off the Kentish Knock Lightship (🇬🇧 United Kingdom) (51.80139°N, 1.73333°W). The crew were rescued by HMT Hekla and HMT Stella Carina (both ).
 * HMS Venetia (1917) : World War II: The V-class destroyer struck a mine and sank in the North Sea off Margate, Kent (51.55°N, 1.16667°W) with the loss of 34 crew.
 * MV Wandby (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (56.75°N, -17.11667°W) by GS U-46 (1938) and GS U-47 (1938) (both ). All 34 crew were rescued by HMT Angle and SS Indira (🇳🇴 Norway).

20 October

 * MV Caprella (🇬🇧 United Kingdom): World War II: Convoy HX 79: The tanker was torpedoed and sunk in the Atlantic Ocean north west of County Donegal, Ireland (56.61667°N, -17.25°W) by GS U-100 (1939) with the loss of one of her 53 crew. Survivors were rescued by HMT Angle and HMT Lady Elsa (both ).
 * SS Conakrian (🇬🇧 United Kingdom): World War II: Convoy OA 232: The cargo ship was torpedoed and damaged in the North Sea 9 nmi off Girdleness, Aberdeenshire by Luftwaffe aircraft and was abandoned. She was taken in tow by HMS Cleveland and beached at Bridge of Don, Aberdeenshire.
 * SS Cubano (1920) (🇳🇴 Norway): Convoy OB 229: World War II: The cargo ship was torpedoed and sunk west of the Outer Hebrides, United Kingdom (57.91667°N, -25°W) by GS U-124 (1940) with the loss of two of her 35 crew. Survivors were rescued by HMCS Saguenay (D79).
 * MV Janus (🇸🇪 Sweden): World War II: Convoy HX 79: The tanker straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean north west of County Donegal, Ireland (56.6°N, -15.05°W) by GS U-46 (1938) with the loss of four of her 37 crew. Survivors were rescued by HMS Hibiscus (K24).
 * MV La Estancia (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57°N, -17°W) by GS U-47 (1938) with the loss of one of her 34 crew. The survivors were rescued by SS Indira (🇳🇴 Norway).
 * Lafolè : World War II: The Adua-class submarine was depth charged, rammed and sunk in the Mediterranean Sea north of Melilla, Spanish Morocco (36°N, -3°W) by HMS Gallant (H59), HMS Griffin (H31) and HMS Hotspur (H01) (all ). Nine survivors were rescued by HMS Gallant and HMS Hotspur.
 * SS Loch Lomond (🇬🇧 United Kingdom): World War II: Convoy HX 79: The cargo ship straggled behind the convoy. She was shelled and sunk in the Atlantic Ocean north west of County Donegal, Ireland (56°N, -14.5°W) by GS U-100 (1940) with the loss of one of her 40 crew. Survivors, including all 72 from SS Matheran (🇬🇧 United Kingdom) were rescued by HMS Jason (J39).
 * MV Sitala (🇬🇧 United Kingdom): World War II: Convoy HX 79: The tanker was torpedoed and sunk in the Atlantic Ocean 150 nmi south west of Rockall, Inverness-shire (56.61667°N, -17.25°W) by GS U-100 (1940) with the loss of one of her 44 crew. Survivors were rescued by HMT Angle and HMT Lady Elsa (both ).
 * SS Sulaco (🇬🇧 United Kingdom): World War II: Convoy OB 229: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57.41667°N, -25°W) by GS U-124 (1940) ( with the loss of 66 of her 67 crew. The survivor was rescued by HMCS Saguenay (D79).
 * SS Whitford Point (🇬🇧 United Kingdom): Convoy HX 79: World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean 90 nmi south west of Rockall (56.63333°N, -16°W) by GS U-47 (1938) with the loss of 37 of her 39 crew. The survivors were rescued by HMS Sturdy (1919).

21 October

 * Astrid ( Soviet Union): World War II: The coaster struck a mine and sank in the Baltic Sea off Leningrad with the loss of thirteen crew.
 * SS Daydawn (🇬🇧 United Kingdom): World War II: The cargo ship was torpeoded and sunk in the Atlantic Ocean 250 nmi west of Bloody Foreland, Ireland (56.5°N, -14.16667°W) by GS U-103 (1940) with the loss of two of her 36 crew. Survivors were rescued by HMS Rhododendron (K78).
 * ITALIAN DESTROYER Francesco Nullo : World War II: The Sauro-class destroyer was shelled and damaged by HMS Kimberley (F50) and beached on Harmi Island, Italian Somaliland She was later bombed and sunk by Bristol Blenheim aircraft of the Royal Air Force.
 * MV Houston City (🇬🇧 United Kingdom): World War II: The cargo ship was bombed and damaged in the Thames Estuary north east of Leysdown-on-Sea, Kent and was beached. Salvage was abandoned on 1 November following repeated bombing during salvage efforts.
 * HMT Joseph Button : World War II: The naval trawler struck a mine and sank in the North Sea off Aldeburg, Suffolk with the loss of five crew.
 * SS Kerry Head (🇮🇪 Ireland): World War II: The collier was bombed and sunk in the Atlantic Ocean 5 nmi south of Blackball Head, County Kerry, Ireland by Luftwaffe aircraft with the loss of all twelve crew.
 * HMS MTB 17 : World War II: The BPB 60' Classmotor torpedo boat struck a mine and sank in the North Sea off Ostend, West Flanders, Belgium.
 * SS Victoria (1919) (🇬🇷 Greece): World War II: Convoy OB 223: The cargo ship was torpedoed and sunk in the Atlantic Ocean 250 nmi west of Bloody Foreland by GS U-103 (1940) . All 27 crew were rescued by HMS Castleton (I23).
 * HMT Waveflower : World War II: The auxiliary minesweeper struck a mine and sank in the North Sea off Aldeburgh, Suffolk with the loss of fifteen of her 22 crew. Survivors were rescued by HMT Thomas Leeds.

22 October

 * SS Astrid (🇫🇮 Finland): World War II: The cargo ship struck a mine and sank in the Gulf of Finland with the loss of ten crew.
 * SS Cairnglen (🇬🇧 United Kingdom): The cargo ship ran aground at Marsden, Northumberland (54.98667°N, -1.37833°W) and was wrecked. All crew were rescued.
 * HMT Hickory : World War II: The Tree class trawler struck a mine and sank in the English Channel south of the Isle of Portland, Dorset with the loss of 24 crew.
 * HMCS Margaree : World War II: Convoy OL 8: The D-class destroyer collided in the Atlantic Ocean with MV Port Fairy (🇬🇧 United Kingdom) and sank with the loss of 142 of her 178 crew.
 * SS Kerry Head (🇬🇧 United Kingdom ): World War II: The cargo ship was bombed and sunk in the Atlantic Ocean off Cape Clear Island, County Cork, Ireland.

23 October

 * Essie (🇸🇪 Sweden): World War II: The trawler struck a mine and sank in the Skagerrak 10 nmi south of Skagen, Nordjylland, Denmark with the loss of six crew.
 * SS Prinsesse Ragnhild (🇳🇴 Norway): World War II: The passenger ship struck a mine and sank in the Norwegian Sea off Bodø, Nordland with the loss of 78 of the 140 people on board.

24 October

 * Adolf Vinnen : World War II: The weather ship was shelled and sunk off Stadtlandet, Norway (62.48333°N, 4.38333°W) by HMS Matabele (F26), HMS Punjabi (F21) and HMS Somali (F33) (all ).

25 October

 * MV Buoyant (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank at the mouth of the Humber.
 * FV Carlton (🇬🇧 United Kingdom): World War II: The trawler struck a mine at the mouth of the Humber and sank with the loss of three of her ten crew.
 * HMT Duthies : World War II: The naval trawler was bombed and sunk at Montrose, Angus. All crew were rescued.
 * Encourage (🇬🇧 United Kingdom): World War II: The trawler struck a mine and sank in the English Channel off Plymouth, Devon with the loss of all four crew.
 * SS Kyle Skye (🇬🇧 United Kingdom): The cargo ship ran aground on the Isle of Arran, Bute and was wrecked.
 * HMT Lord Inchcape (FY 1611) : World War II: The naval trawler struck a mine and sank in the English Channel off Plymouth, Devon. She was later salvaged.
 * South Goodwin Lightship (🇬🇧 United Kingdom): World War II: The lightship was bombed and sunk in the North Sea off St Margaret's Bay, Kent by Luftwaffe aircraft.
 * Windsor (🇬🇧 United Kingdom): World War II: The fishing vessel struck a mine and sank in the River Humber south of Spurn Point, Yorkshire with the loss of one crew member.

26 October

 * MV Dosinia (🇬🇧 United Kingdom): World War II: The tanker struck a mine, broke in two and sank in Liverpool Bay off Southport, Lancashire. All crew were rescued.
 * SS Katanga (🇧🇪 Belgium): World War II: The cargo ship struck a mine off the Bar Lightship, River Mersey, United Kingdom and was damaged.
 * SS H. J. Kyvig (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in Sognefjord by Royal Air Force aircraft.
 * SS Matina (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed, shelled and damaged in the Atlantic Ocean west of the Outer Hebrides (57.5°N, -16.51667°W) by GS U-28 (1936) . The 69 crew took to the lifeboats, but were not seen again. She was torpedoed and sunk on 29 October by GS U-31 (1936).
 * SS Strombus (🇳🇴 Norway): World War II: The whale factory ship struck a mine and sank in the Bristol Channel off Swansea, Glamorgan (51.56333°N, -3.94667°W). All crew were rescued by HMT Silja and ST Victor (🇬🇧 United Kingdom).

27 October

 * MV Margaretha (🇳🇱 Netherlands): World War II: The coaster struck a mine and sank in the Bristol Channel off Newport, Monmouthshire (51.36667°N, -3.2°W). All crew were rescued.
 * SS Meggie (🇸🇪 Sweden): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean 70 nmi off Santa Maria Island, Azores, Portugal by ITALIAN SUBMARINE Nani . All crew were rescued.
 * Persevere (🇬🇧 United Kingdom): World War II: The drifter struck a mine and sank in the Firth of Forth.
 * MV Suavity (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank in the North Sea off Hartlepool, Co Durham (54.73333°N, -1.08333°W). All crew were rescued.

28 October

 * ST Devonia (🇬🇧 United Kingdom): World War II: The tug struck a mine and sank in the Bristol Channel off Newport, Monmouthshire (51.38333°N, -3.25°W) with the loss of three of her four crew.
 * Empress of Britain (🇬🇧 United Kingdom): World War II: The troopship was torpedoed and sunk in the Atlantic Ocean north west of Ireland by GS U-32 (1937).
 * HMT Harvest Gleaner : World War II: The naval trawler was bombed and sunk in the North Sea off Southwold, Suffolk with the loss of four crew.
 * SS H J Kyvig (🇳🇴 Norway): World War II: The coaster was torpedoed and sunk in Sunnfjord, Sogn og Fjordane by an aircraft with the loss of five crew.
 * ICEBREAKER Malygin ( Soviet Union): The icebreaker foundered and sank in a storm off Kamchatka, Soviet Union. All 98 on board were lost.
 * MV Sagacity (🇬🇧 United Kingdom): World War II: The coaster struck a mine and sank in the River Humber south west of Spurn Point, Yorkshire. All crew were rescued.
 * SS Sheaf Field (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea off the mouth of the River Deben, Suffolk. Twenty-six crew survived.
 * SS Wythburn (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the Bristol Channel off Newport, Monmouthshire (51.36667°N, -3.25°W) with the loss of five crew.

29 October

 * SS G W Humphreys (🇬🇧 United Kingdom): World War II: The sludge carrier struck a mine and sank in the East Oaze Deep, Thames Estuary, north of Leysdown-on-Sea, Kent with the loss of seven crew.

30 October

 * SS Alcora (🇬🇧 United Kingdom): The cargo ship came ashore at Rattray Head, Aberdeenshire and was wrecked.
 * Bragi (Light Blue Flag of Iceland.svg Iceland): The trawler was sunk in a collision with TSS Duke of York (🇬🇧 United Kingdom) off Wyre Light, England.
 * ML 109 : World War II: The motor launch struck a mine in the Humber and sank with the loss of three crew.
 *  Placidas Faroult (🇫🇷 France): World War II: The auxiliary lugger was stranded and wrecked at Salcombe, Devon, United Kingdom.
 * ST Seagem (🇬🇧 United Kingdom): The tug sank.
 * SS Simonburn (🇬🇧 United Kingdom): The cargo ship ran aground off Rattray Head, Aberdeenshire and was wrecked.
 * HMS Sturdy (H28) : World War II: Convoy SC 8: The S-class destroyer ran aground off Tiree, Inner Hebrides and was wrecked with the loss of five crew.
 * GS U-32 (1937) : World War II: The Type VIIA submarine was depth charged and sunk in the Atlantic Ocean north west of Ireland by HMS Harvester (H19) and HMS Highlander (H44) (both ) with the loss of nine of her 42 crew. Survivors were rescued by HMS Harvester and HMS Highlander.
 * SS Victoria (1914) (🇬🇧 United Kingdom): World War II: Convoy SLS 51: The cargo ship was bombed and sunk in the Atlantic Ocean west of County Donegal, Ireland by Luftwaffe aircraft.

31 October

 * Aldebaran (🇩🇪 Germany): World War II: The trawler struck a mine and sank in the Baltic Sea off Liepāja, Estonia.
 * SS Hillfern: The cargo ship sank in the North Sea 35 nmi off Buchan Ness, Aberdeenshire following an explosion with the loss of eight crew.
 * MTB-16 : World War II: The motor torpedo boat struck a mine and sank in the North Sea off Clacton-on-Sea, Essex.
 * SS Rutland (🇬🇧 United Kingdom): World War II: Convoy HX 82: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the Atlantic Ocean west of the Outer Hebrides (57°N, -16°W) by GS U-124 (1940) with the loss of all 29 crew.
 * HMT Wardour : World War II: The naval trawler struck a mine and sank in the North Sea. Twelve crew were rescued by HMS Douglas (D90).

Unknown date

 * North Goodwin Lightship (🇬🇧 United Kingdom): The lightship was driven ashore at Walmer, Kent after her anchor chain broke in a storm.
 * SS St Malo (🇨🇦 Canada): World War II: The cargo ship was lost through enemy action.
 *  Oscar Robinson (🇦🇺 Australia): The ketch sank in the Pacific Ocean off Port Adelaide, South Australia.
 * SS Øyulf (🇳🇴 Norway): World War II: The cargo ship struck a mine and sank in the North Sea off Haugesund.
 * GERMAN SUBMARINE CHASER UJ-173 : World War II: The submarine chaser ran aground at Sveiane, Norway and was wrecked. She sank on 14 October during salvage attempts.