List of shipwrecks in October 1917

The list of shipwrecks in October 1917 includes some ships sunk, foundered, grounded, or otherwise lost during October 1917.

1 October

 *  Carrabin ( undefined): World War I: The barque was torpedoed and sunk in the Atlantic Ocean south of Daunt Rock by SMU U-96 . Her crew survived.
 * SS Etna (1914) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 110 nmi south east of Madeira, Portugal (33.68333°N, -15.41667°W) by SMU U-151.
 * Ludovicos ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea 7 nmi south of Pissouri, Cyprus by SMU U-73.
 * SS Mersario (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean (86 nmi west by north of Cape Spartel, Morocco by SMU U-39 with the loss of three crew.
 * USRC Mohawk : The cutter collided with SS Vennacher ( undefined) in the Atlantic Ocean off Sandy Hook, New Jersey and sank. Her crew were rescued.
 *  Neuilly (🇫🇷 France): World War I: the barque was scuttled in the Atlantic Ocean 450 nmi south west of Penmarc'h, Finistère (46.23333°N, -13.11667°W) by SMU U-90 . Her crew survived.
 * SS Normanton (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 115 nmi west of Cape Spartel (35.43333°N, -8.25°W) by SMU U-39 . Her crew survived.
 *  Saint Pierre (🇫🇷 France): World War I: The schooner was shelled and sunk in the Atlantic Ocean 60 nmi north west of Ouessant, Finistère (48.5°N, -10°W) by SMU U-60.

2 October

 * SS Almora (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 100 nmi west by north of Cape Spartel, Morocco (35.61667°N, -7.76667°W) by SMU U-39 . Her crew survived.
 * HMS Drake (1901) : World War I: The Drake-class cruiser was torpedoed and sunk off Rathlin Island, County Antrim by SMU U-79 with the loss of eighteen of her 900 crew.
 * SS Hikosan Maru (1892) (🇯🇵 Japan): World War I: The cargo ship was sunk in the Atlantic Ocean west of Cape Spartel (35.46667°N, -8.61667°W) by SMU U-39 . Her crew survived.
 * SS Imera (1870) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Ionian Sea off Santa Maria di Leuca, Lecce by SMU UB-48.
 * SS Lugano (1917) ( undefined): World War I: The cargo ship struck a mine and sank in the Atlantic Ocean 2 nmi south west of Bull Point, County Antrim. Her crew survived.
 * SS Nuceria (1914) ( undefined): World War I: The collier was torpedoed and sunk in the Atlantic Ocean 120 nmi west of Cape Spartel (35.45°N, -8.41667°W) by SMU U-39 with the loss of two crew.
 * SS Trafaria (1904) (🇵🇹 Portugal): World War I: The cargo ship was sunk in the Atlantic Ocean 20 nmi north north west of Cape Ortegal, Spain (45.58333°N, -9.05°W) by SMU U-88.
 *  Viajante (🇵🇹 Portugal): World War I: The barque was sunk in the Atlantic Ocean 170 nmi north west of Porto Santo Island, Madeira (35.66667°N, -15.16667°W) by SMU U-151.
 * Willing Boys ( undefined): World War I: The fishing smack struck a mine and sank in the North Sea with the loss of five of her crew.

3 October

 * Annie F. Conlon (🇺🇸 United States): World War I: The sailing vessel was damaged in the Atlantic Ocean 15 nmi south east of the Isles of Scilly, United Kingdom by SMU UC-47 . Her crew survived, but she was subsequently declared a constructive total loss.
 * SS Baron Blantyre (1908) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 60 nmi north west by west of Cape Finisterre, Spain (43.25°N, -10.5°W) by SMU U-88 with the loss of a crew member.
 * Britannia ( undefined): The sloop foundered in the North Sea with the loss of a crew member.
 *  Elisa ( undefined): World War I: The brigantine was shelled and sunk in the Tyrrhenian Sea off Cape Figari, Sardinia (41.11667°N, 9.78333°W) by SMU UC-35.
 * SS Ellerslie ( undefined): The collier was lost on this date.
 * Giuseppe Ferrante ( undefined): World War I: The sailing vessel was sunk in the Tyrrhenian Sea off Isola del Giglio by SMU UC-35.
 * SS Hurst (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in St. George's Channel 2.25 nmi west by north of Skokholm, Pembrokeshire by SMU U-96 . Her crew survived.
 *  Jane Knox ( undefined): The schooner was wrecked in the Bristol Channel off Porthcawl, Glamorgan with the loss of all hands.
 *  Jeanne (🇫🇷 France): World War I: The three-masted schooner was sunk in the Bay of Biscay (46.71667°N, -13.38333°W) by SMU U-90 with the loss of six of her crew.
 * SS Memling ( undefined): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay off Brest, Finistère, France by a Kaiserlich Marine submarine.
 *  Saint Antoine (🇫🇷 France): World War I: The schooner was sunk in the Bay of Biscay (47.5°N, -9.66667°W) by SMU U-60.
 *  Stella (🇫🇷 France): World War I: The schooner was shelled and sunk in the Bay of Biscay (47.5°N, -9.66667°W) by SMU U-60 with the loss of ten crew.
 * SS Tasmania (1900) ( undefined): World War I: The cargo ship was sunk in the English Channel 8 nmi west of Prawle Point, Devon, United Kingdom by SMU UC-65.
 * SMU UC-14 : World War I: The Type UC I submarine struck a mine and sank in the North sea off Zeebrugge, West Flanders, Belgium (51.53056°N, 3.14583°W) with the loss of all fourteen crew.

4 October

 * SS Bygdønes (1892) (🇳🇴 Norway): World War I: The cargo ship was captured in the Atlantic Ocean by SMU U-151 . She was scuttled the next day 65 nmi north west of Porto Santo Island, Madeira, Portugal. Her crew survived.
 * SS Citta di Bari (1913) ( undefined): World War I: The passenger ship was sunk in the Ionian Sea 37 nmi off Paxos, Greece by SMU UB-48.
 * SS Constantinos Embiricos (1903) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Gulf of Lyon off the Île du Planier, Bouches-du-Rhône, France (42.78333°N, 4.16667°W) by SMU U-32 (Germany) . Her crew survived.
 * SS Itasca (1871) (🇺🇸 United States): The cargo ship foundered in the Atlantic Ocean.
 * SS Nicolaos Roussos (1890) (🇬🇷 Greece): The cargo ship was torpedoed and sunk in the Gulf of Lyon (42.76667°N, 4.18333°W) by SMU U-32 (Germany).
 * Perseverance ( undefined): World War I: The fishing smack was shelled and sunk in the Atlantic Ocean 15 nmi west of the Eddystone Lighthouse by SMU UB-35 . Her crew survived.
 * USS Rehoboth (SP-384) : The patrol vessel sprang a leak in the English Channel. Her crew were rescued by HMS Castor (1915) (, which scuttled the ship.
 * Rupee ( undefined): World War I: The fishing smack was shelled and sunk in the Bristol Channel 10 nmi north of Lundy Island, Devon by SMU U-96 with the loss of four crew.
 * FRENCH TRAWLER Stella : World War I: The naval trawler struck a mine and sank in the Mediterranean Sea off Cape Bougaroni, Algeria.
 * Young Clifford ( undefined): World War I: The fishing smack was shelled and sunk in the Bristol Channel 12 nmi north of Lundy Island by SMU U-96 . Her crew survived.

5 October

 *  Apache: (🇫🇷 France): The auxiliary barque foundered on this date with the loss of fifteen of her nineteen crew.
 * SS Bontnewydd (1897) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 60 nmi north north east of Marsa Susa, Libya (33.88333°N, 22.31667°W) by SMU U-28 (Austria-Hungary) with the loss of three of her crew.
 * SS Forestmoor (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 54 nmi west north west of Cape Spartel, Morocco (35.95°N, -7.05°W) by SMU UB-51 with the loss of 22 crew.
 * Galley ( undefined): The ketch foundered on this date. Her crew survived.
 * SMU UB-41 : World War I: The Type UB II submarine struck a mine and sank in the North Sea off Scarborough, Yorkshire, United Kingdom with the loss of all 22 crew.

6 October

 * SS Bedale (1914) ( undefined): World War I: The collier was torpedoed and sunk in the Atlantic Ocean 25 nmi south east by south of Mine Head, Cornwall by SMU U-96 with the loss of three of her crew.
 * SS Civilian (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 15 nmi north of Alexandria, Egypt by SMU UC-74 with the loss of two of her crew.
 *  Lamartine (🇫🇷 France): World War I: The barquentine was shelled and sunk in the Atlantic Ocean 60 nmi south west of The Lizard, Cornwall by SMU UC-69.
 * SMS T54 : World War I: The S7-class torpedo boat struck a mine and sank in the Baltic Sea with the loss of seven of her crew.
 *  Victorine (🇫🇷 France): World War I: The barque was shelled and damaged in the Atlantic Ocean 96 nmi north west of Cape Ortegal, Spain (44.83333°N, -9.5°W) by SMU U-88 .She sank the next day.

7 October

 * Alcyon ( undefined): World War I: The sailing vessel was scuttled in the English Channel 12 nmi west north west of Boulogne, Pas-de-Calais, France by SMU UB-57 . Her crew survived.
 *  Georgios (🇬🇷 Greece): World War I: The barque was sunk in the Mediterranean Sea north east of Misrata, Libya by SMU UC-73.
 * Reliance ( undefined): World War I: The drifter struck a mine and sank in the North Sea with the loss of ten of her crew.
 * SMU U-106 : World War I: The Type U 93 submarine struck a mine and sank in the North Sea 40 nmi north of Terschelling, Friesland, Netherlands with the loss of all 41 crew.

8 October

 * SS Aylevarroo (1896) ( undefined): World War I: The coaster was sunk in the Atlantic Ocean off Ballycottin Island, County Cork (51.75°N, -7.85°W) by SMU U-57 with the loss of all twenty crew.
 * HMT Ben Heilem : The naval trawler was lost on this date.
 * SS Greldon (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in St. George's Channel 7 nmi east north east of the North Arklow Lightship ( undefined) by SMU U-96 with the loss of 28 crew.
 * SS Memphian (1908) ( undefined): World War I: The cargo liner was torpedoed and sunk in St. George's Channel 7 nmi east north east of the North Arklow Lightship ( undefined) by SMU U-96 with the loss of 32 crew.
 * SS Richard de Larrinaga (1916) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 15 nmi south east of Ballycottin Island by SMU U-57 with the loss of 35 crew.

9 October

 * HMS Champagne : World War I: The armed merchant cruiser was torpedoed and sunk in the Irish Sea 8 nmi south west of the Calf of Man, Isle of Man (54.28333°N, -5.16667°W) by SMU U-96 with the loss of 58 of her 305 crew. Survivors were rescued by the Peel and Port St. Mary Lifeboats.
 * SS Main (1904) ( undefined): World War I: The coaster was shelled and sunk in Luce Bay 1.5 nmi east of Drummore, Wigtownshire by SMU UC-75 with the loss of twelve of her crew. She was refloated on 7 August 1920, repaired, and returned to service in August 1922.
 * SS Nervier (🇧🇪 Belgium): World War I: The cargo ship was torpedoed, shelled and damaged off the Orkney Islands by SMU U-101 . She sank on 12 October with loss of all hands.
 * SS Niki (1888) (🇬🇷 Greece): World War I: The coaster was sunk in the Ionian Sea 30 nmi north of Cape Matapan by SMU UB-48 . Her crew survived.
 * SS Peshawur (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 7 nmi south east of Ballyquintin Point, County Down by SMU U-96 with the loss of eleven of her crew.
 * SS Poldown (1904) ( undefined): World War I: The collier struck a mine and sank in the Atlantic Ocean 2 nmi west south west of Trevose Head, Cornwall (50.51667°N, -5.08333°W) by SMU UC-51 with the loss of eighteen of her crew.
 * SS San Blas (🇵🇦 Panama): The cargo ship sank at Bocas Town, Bocas del Toro.

10 October

 * HMS Bostonian (1896) : World War I: The escort ship was torpedoed and sunk in the English Channel 34 nmi south by east of Start Point by SMU U-53 with the loss of four crew.
 * SS Gowrie (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 14 nmi north east of Cherbourg, Seine-Maritime, France by SMU U-53 . Her crew survived.
 * SS Transporteur (1904) (🇫🇷 France): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 30 nmi off Malta (35.48333°N, 14.96667°W) by SMU U-32 (Germany) with the loss of a crew member.
 * HMT Waltham : The naval trawler was lost on this date.

11 October

 * Aghios Georgios ( undefined): World War I: The ship was sunk in the Black Sea by SMU UB-42.
 * SS Baychattan (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 0.5 nmi south south west of Prawle Point, Devon by SMU UC-50 . Her crew survived.
 * SS Cayo Bonito (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Gulf of Genoa 4 nmi east north east of Savona, Liguria, Italy (44.23333°N, 8.5°W) by SMU UC-35 with the loss of six of her crew.
 * SS Elve (1904) ( undefined): World War I: The coaster was shelled and sunk in the Atlantic Ocean off Cape Finisterre, Spain (46.38333°N, -11.31667°W) by SMU U-22 (Germany) . Her 29 crew took to the lifeboats but did not survive.
 * SS Italia (1909) ( undefined): World War I: The cargo ship was sunk in the Gulf of Genoa 4 nmi east north east of Savona (44.23333°N, 8.5°W) by SMU UC-35.
 * Joshua ( undefined): World War I: The sailing vessel was scuttled in the English Channel west of the Isle of Wight by SMU UB-57 with the loss of three crew.
 * HMY Kethailes : The naval yacht collided with another vessel and sank in the Irish Sea off the Blackwater Lightship ( undefined).
 * SS Lewis Luckenbach (1903) (🇺🇸 United States): World War I: The cargo ship was sunk in the English Channel 10 nmi west of the Île Vierge, Finistère, France (48.78333°N, -4.71667°W) by SMU U-53 with the loss of ten crew.
 * SS Lovli (1916) ( undefined): World War I: The cargo ship was sunk in the Gulf of Genoa (44.23333°N, 8.48333°W) by SMU UC-35.
 * SS Mira (1901) ( undefined): World War I: The tanker struck a mine and sank in the English Channel 4 nmi off Beachy Head, East Sussex (50.68333°N, 0.15°W). Her crew survived.
 * Panormitis (🇫🇷 France): World War I: The sailing vessel was sunk in the Mediterranean Sea off the coast of Egypt by SMU UC-74 . Her crew survived.
 * SS Rhodesia (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Bristol Channel 7 nmi south east by south of the Coningbeg Lightship ( undefined) by SMU U-61 with the loss of four crew.

12 October

 * SS Cape Corso (1905) ( undefined): World War I: The cargo ship was torpedoed and damaged in the Irish Sea 9 nmi off the St. Govan Lightship ( undefined) by SMU U-57 with the loss of thirteen crew. Although she subsequently broke her back, she was repaired and returned to service.
 * SS Georgios Markettos (1890) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Irish Sea 4 nmi off the St. Govan Lightship ( undefined) by SMU U-57 . Her crew survived.
 * SS Peebles (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 14 nmi off Flamborough Head, Yorkshire by SMU UB-18 . Her crew survived.
 * SS Themis (1911) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Mediterranean Sea 22 nmi north of Cape Bon, Algeria (37.43333°N, 11.06667°W) by SMU UB-51.
 * SS W. M. Barkley (1898) ( undefined): World War I: The coaster was torpedoed and sunk in the Irish Sea 7 nmi east of the Kish Lightship ( undefined) by SMU UC-75 with the loss of four of her crew.

13 October

 * SS Alavi (1893) ( undefined): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 6 nmi north east of Cape Palos, Murcia, Spain (37.66667°N, -0.56667°W) by SMU U-35 (Germany) with the loss of thirteen crew.
 * Bethel (🇳🇴 Norway): World War I: The sailing vessel was sunk in the North Sea (56.13333°N, 0.96667°W) by SMU UB-58 . Her crew survived.
 * SS Caprera (1904) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean 60 nmi west of Casablanca, Morocco (33.88333°N, -8.75°W) by SMU U-151 . Her 45 crew were rescued by SS Ernesto (🇪🇸 Spain).
 * SS Despina G. Michalinos (1907) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Mediterranean Sea off Carthagena, Spain (37.7°N, -0.55°W) by SMU U-35 (Germany).
 * SS Doris (1901) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea off Cape Palos (37.76667°N, -0.63333°W) by SMU U-35 (Germany).
 * SS Diu (1901) (🇵🇹 Portugal): World War I: The cargo ship was sunk in the Atlantic Ocean 4 nmi off the Tuskar Rock, Ireland by SMU U-57.
 * SS Eskmere (1916) ( undefined): World War I: The collier was torpedoed and sunk in the Irish Sea 15 nmi west north west of South Stack, Anglesey by SMU UC-75 with the loss of 20 of her crew.
 *  Esmerelda (🇸🇪 Sweden): World War I: The barque was sunk in the North Sea by SMU UB-58 . Her crew survived.
 * SS Lilla (1888) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea off Carthagena (37.75°N, -0.63333°W) by SMU U-35 (Germany) . Her crew survived.
 * SS Woodburn (1900) ( undefined): World War I: The cargo ship was torpedoed and damaged in the English Channel 3 nmi south east of The Lizard, Cornwall by SMU U-62 . She was beached at Falmouth. Later refloated, repaired and returned to service.

14 October

 * SS Barbro (1891) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 13 nmi north north west of the Île de Batz, Finistère, France (48.91667°N, -4.23333°W) by SMU UC-48 with the loss of two of her crew.
 * SS Castro (1897) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Atlantic Ocean 10 nmi north north east of Brignogan, Finistère by SMU UC-48 . Her crew survived.
 * HMT Clyde (: The naval trawler collided with another vessel and sank in the English Channel off Sidmouth, Devon.
 * SS Ecaterini C. D. (1906) (🇬🇷 Greece): World War I: The cargo ship was sunk in the Atlantic Ocean (46.81667°N, -12.35°W) by SMU U-105.
 * SS East Wales (1915) ( undefined): World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 8 nmi south by west of Daunts Rock (51.66667°N, -8.21667°W) by SMU U-57 with the loss of three crew.
 * RUSSIAN DESTROYER Grom : The Azard-class destroyer was shelled and damaged in the Gulf of Riga by SMS V100 and was abandoned. She was taken in tow by V100 but consequently foundered.
 * SS Lido G. (1872) ( undefined): World War I: The coaster was sunk in the Mediterranean Sea north east of Misrata, Libya by SMU UC-73.
 * SS Semantha (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 10 nmi north west by north of Cape St. John, Crete, Greece by SMU UC-74 with the loss of 32 of her crew.
 * SMU UC-62 : World War I: The Type UC II submarine struck a mine and sank in the North Sea off Zeebrugge, West Flanders, Belgium with the loss of all 26 crew.
 * SS Valparaiso (1890) ( undefined): World War I: The cargo ship was torpedoed and sunk off Marsa Susa, Libya (36.93333°N, 21.96667°W) by SMU UB-48 . The wreck was raised in 1928 and sold for scrap in January 1930.

15 October

 * HMT Active III : World War I: The naval trawler struck a mine and sank in the Irish Sea between Grassholm and Skokholm, Pembrokeshire with the loss of all ten crew.
 * USS Cassin (DD-43) : World War I: Action of 15 October 1917: The Cassin-class destroyer was torpedoed and damaged in the Atlantic Ocean 20 nmi south of Mine Head, County Cork, United Kingdom by SMU U-61 with the loss of a crew member. She was taken in tow by HMS Snowdrop (1915) . Subsequently repaired and returned to service.
 * SS Garthclyde (1917) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 12 nmi west of The Lizard, Cornwall (49.91667°N, -5.5°W) by SMU UC-79 . Her crew survived.
 * SS Hartburn (1900) ( undefined): World War I: The cargo ship struck a mine and sank in the English Channel 10 nmi south of Anvil Point, Dorset with the loss of three of her crew.
 * SS Hovde (1888) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 11 nmi north west of the Île de Batz, Finistère, France by SMU UC-48 with the loss of a crew member.
 * Saint Paul (🇫🇷 France): World War I: The sailing vessel was shelled and sunk in the Bay of Biscay (46.48333°N, -10.43333°W) by SMU U-105 with the loss of a crew member.
 * SS St. Helens (1907) (🇺🇸 United States): World War I: The cargo ship was sunk in the Atlantic Ocean 100 nmi west north west of Cape Vilano, Spain (45.95°N, -11.31667°W) by SMU U-105 with the loss of 24 crew.
 * SS White Head (1880) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 14 nmi north north east of Suda Bay, Crete, Greece (36.21667°N, 24.55°W) by SMU UC-74 with the loss of 23 of her crew.

16 October

 * SMS Eber : World War I: The gunboat was scuttled at Salvador, Bahia, Brazil.
 * SS Est (1912) : World War I: The cargo ship was sunk in the Baltic Sea off Ekenäs, Finland (59.85°N, 23.76667°W) by SMU UC-60.
 *  Jennie E. Righter (🇺🇸 United States): World War I: The three-masted schooner was scuttled after being shelled in the Atlantic Ocean north west of Spain (43.9°N, -10.03333°W) by SMU U-22 (Germany) . Her crew survived.
 * SMS T56 : The S7-class torpedo boat ran aground and sank in the Baltic Sea.

17 October

 * SS Adams (1887) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 6 nmi south east by east of The Lizard, Cornwall (49.9°N, -5.06667°W) by SMU U-62 . Her crew survived.
 * USAT Antilles : World War I: The troopship was torpedoed and damaged in the Bay of Biscay (48.16667°N, -11.25°W) by SMU U-105 with the loss of 67 lives. Survivors were rescued by USS Corsair (SP-159)  and the ship was scuttled.
 * SS California (1902) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 145 nmi north north west of Cape Villano, Spain (45°N, -11.43333°W) by SMU U-22 (Germany) with the loss of four lives.
 * SS Habil (1896) (🇳🇴 Norway): World War I: Action off Lerwick: The coaster was shelled and sunk in the North Sea off Lerwick, Shetland Islands, United Kingdom by SMS Bremse and SMS Brummer) (both ).
 * SS Kristine (1889) (🇳🇴 Norway): World War I: Action off Lerwick: The coaster was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer) (both ) with the loss of ten of her eleven crew.
 * HMT Jean : The naval trawler was lost in the Mediterranean Sea on this date.
 * SS Manchuria (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 60 nmi west of Ouessant, Finistère, France by SMU U-53 with the loss of 26 crew.
 * HMS Mary Rose (1915) : World War I: Action off Lerwick: The M-class destroyer was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer (both ) with the loss of 88 of her 98 crew.
 * SS Polvena (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 25 nmi north by east of Ouessant (48.91667°N, -5.16667°W) by SMU U-53 with the loss of three crew.
 * HMT Ruby (1916) : World War I: The naval trawler was torpedoed and sunk in the Atlantic Ocean off Ouessant (48.83333°N, -5.16667°W) by SMU UC-79 with the loss of all eighteen crew.
 * SS Silja (1905) (🇳🇴 Norway): World War I: Action off Lerwick: The cargo ship was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer) (both ).
 * RUSSIAN BATTLESHIP Slava : World War I: Battle of Moon Sound: The was scuttled in Moon Sound. The wreck was scrapped in 1935.
 * SS Sørhaug (1898) (🇳🇴 Norway): World War I: Action off Lerwick: The cargo ship was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer) (both ).
 * SS Stella (1912) (🇩🇰 Denmark): World War I: Action off Lerwick: The coaster was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer) (both ).
 * HMS Strongbow (1916) : World War I: Action off Lerwick: The R-class destroyer was shelled and sunk in the North Sea off Lerwick by SMS Bremse and SMS Brummer (both ) with the loss of 47 of her crew.

18 October

 * SS Altair (1884) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 8 nmi north east by north of Newquay, Cornwall, United Kingdom (50.51667°N, -5.28333°W) by SMU UC-64 with the loss of five of her crew.
 * SS Amsteldam (1907) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 6 nmi north of Flamborough Head, Yorkshire by SMU UB-21 with the loss of four of her crew.
 * SS Anna Scotto (1871) ( undefined): World War I: The coaster struck a mine and sank in the Mediterranean Sea off Capo Isole delle Correnti, Sicily.
 * SS Cadmus (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 20 nmi south by east of Flamborough Head by SMU UC-47 . Her crew survived.
 * HMT Comrades : World War I: The naval trawler struck a mine and sank in the English Channel off Cap d'Antifer, Seine-Maritime, France by SMU UC-65 . Her crew survived.
 * SS Itero (🇳🇴 Norway): The cargo ship foundered in the Atlantic Ocean 500 nmi west of Cape Finisterre, Spain. Thirty-one of her crew were rescued by a Spanish fishing vessel.
 * SS Lorenzo (1887) ( undefined): World War I: The cargo ship was sunk in the Atlantic Ocean west of Gibraltar by SMU U-35 (Germany) . Her crew survived.
 * SS Macao (1912) (🇧🇷 Brazil): World War I: The cargo ship was sunk in the Atlantic Ocean 200 nmi off Cape Finisterre, Spain (45.68333°N, -10.71667°W) by SMU U-93.
 * SS Madura (1901) ( undefined): World War I: The cargo ship was torpeoded and sunk in the Atlantic Ocean 23 nmi west south west of the Bishop Rock, Isles of Scilly (49.6°N, -6.93333°W) by SMU U-62 with the loss of three crew.
 * SMS S64 : World War I: The V25-class destroyer struck a mine and sank in the Baltic Sea.
 * SS Sten (1883) ( undefined): World War I: The coaster was torpedoed and sunk in the Atlantic Ocean 5 nmi north of the Godrevy Lighthouse, Cornwall (50.31667°N, -5.43333°W) by SMU UC-64 with the loss of nine of her crew.
 * SMS T66 : World War I: The S66-class torpedo boat struck a mine and sank in the Gulf of Riga.
 * SS Togston (1909) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 20 nmi south by east of Flamborough Head (53.66667°N, 0.2°W) by SMU UC-47 with the loss of five of her crew.

19 October

 * SS Australdale (1907) (🇦🇺 Australia): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 165 nmi north north west of Cape Villano, Spain (45.4°N, -11.53333°W) by SMU U-22 (Germany) with the loss of 27 crew.
 * SS Britannia (1889) ( undefined): World War I: The cargo ship was sunk in the English Channel off Portland Bill, Dorset by SMU UC-75 with the loss of all 22 crew.
 * SS Camswan (1917) ( undefined): The cargo ship collided with another vessel and sank. Her crew were rescued.
 *  Cupica ( undefined): World War I: The auxiliary barque was shelled and sunk in the Atlantic Ocean 75 nmi west by south of the Bishop Rock, Isles of Scilly by SMU U-107 and SMU UC-79 (both ). Her crew survived.
 *  Eldra ( undefined): World War I: The barquentine was scuttled in the English Channel 25 nmi north west of Le Tréport, Seine-Maritime, France by SMU UC-77 . Her crew survived.
 * SS Elsiston (1915) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 150 nmi east by south of Malta (35.66667°N, 17.46667°W) by SMU U-14 (Austria-Hungary) with the loss of a crew member.
 * SS Gemma (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 5 nmi north by west of Flamborough Head, Yorkshire by SMU UB-21 with the loss of four of her crew.
 * SS Good Hope (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 125 nmi east by south of Malta (35.88333°N, 17.08333°W) by SMU U-14 (Austria-Hungary) . Her crew survived.
 * SS Harpon (1897) (🇫🇷 France): World War I: The cargo ship was damaged in the Atlantic Ocean off the coast of Río de Oro (24.36667°N, -15.83333°W) by SMU U-151 . She was beached but was declared a constructive total loss. Her crew survived.
 * SS Hazelwood (1904) ( undefined): World War I: The cargo ship struck a mine and sank in the English Channel 8 nmi south by east of Anvil Point, Dorset with the loss of 32 of her crew.
 * SS Ikoma Maru (1891) (🇯🇵 Japan): World War I: The cargo ship was sunk in the Atlantic Ocean 30 nmi off Cap Cantin, Morocco by SMU U-35 (Germany) . Her crew survived.
 * SS J. L. Luckenbach (🇺🇸 United States): World War I: The ocean liner was torpedoed and damaged in the Atlantic Ocean by SMU U-62 . She was escorted to Le Havre, Seine-Maritime, France by USS Nicholson (DD-62) . Subsequently repaired and returned to service.
 *  Martha (🇩🇰 Denmark): World War I: The barque was shelled and sunk in the North Sea (61.2°N, -2.16667°W) by SMU UB-66 . Her ten crew took to the lifeboats but were not rescued.
 * HMS Orama World War I: The armed merchant cruiser was sunk in the Atlantic Ocean (48°N, -9.33333°W) by SMU U-62  with the loss of five crew. Three hundred and five survivors were rescued by USS Jacob Jones (DD-61).
 * SS Parkhaven (1908) (🇳🇱 Netherlands): World War I: The cargo ship was sunk in the North Sea 15 nmi off the Noord Hinder Lightship (🇳🇱 Netherlands) (52.26667°N, 2.76667°W) by SMU U-53.
 * SS Pera (1903) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 105 nmi east by north of Marsa Susa, Libya (37.26667°N, 24°W) by SMU UB-48 with the loss of a crew member.
 * FRENCH TRAWLER Renard : World War I: The naval trawler struck a mine and sank in the Atlantic Ocean south east of Ouessant, Finistère (48.46667°N, -4.96667°W) with the loss of eleven of her crew. Survivors were rescued by FRENCH TORPEDO BOAT 260.
 * SS Slavonic (1905) ( undefined): World War I: The cargo ship struck a mine and sank in the North Sea off Lerwick, Shetland Islands, United Kingdom.
 * SS Staro (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean (45°N, -12.11667°W) by SMU U-22 (Germany) . Her crew survived.
 * SS Teespool (1905) ( undefined): World War I: The cargo ship was damaged in the English Channel 3 nmi south east of Dartmouth, Devon by SMU UB-38 with the loss of four of her crew. She was beached but was later refloated.
 * SS Waikawa (1907) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 4 nmi east north east of Start Point, Devon by SMU UB-31 . Her crew survived.
 * SS War Clover ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 25 nmi east north east of Pantellaria, Italy (37°N, 12.58333°W) by SMU U-64 (Germany) with the loss of fourteen crew.
 * SS Wellington (1905) ( undefined): World War I: the cargo ship was torpedoed and damaged in the English Channel 5 nmi south south east of Portland Bill by SMU UB-40 . She was taken in tow by HMT Flo Johnson ( and beached at Portland. Later repaired and returned to service.

20 October

 * SS Algarve (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 15 nmi south west of Portland Bill, Dorset by SMU UB-38 with the loss of 21 of her crew.
 * SS Collegian (1899) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 100 nmi north west by north of Alexandria, Egypt (32.58333°N, 28.68333°W) by SMU UB-48 . Her crew survived.
 * SS Colorado (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 1.5 nmi east of Start Point, Devon by SMU UB-31 with the loss of four crew.
 * SS Ionian (1901) ( undefined): World War I: The passenger ship struck a mine and sank in the Irish Sea 2 nmi west of St. Govan's Head, Pembrokeshire (51.58333°N, -4.98333°W) with the loss of seven lives.
 * SS Leander (1892) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 3.5 nmi north north east of Flamborough Head, Yorkshire, United Kingdom by SMU UB-57 with the loss of a crew member.
 * SS Moyori Maru (1902) (🇯🇵 Japan): World War I: The cargo ship was sunk in the Atlantic Ocean 30 nmi off Cape Barbas, Morocco (22.28333°N, -17.23333°W) by SMU U-151.
 * SS Nitedal (1903) (🇳🇴 Norway): World War I: The cargo ship was sunk in the North Sea 4 nmi east south east of Flamborough Head by SMU UB-57 with the loss of twelve crew.
 *  Norden (🇸🇪 Sweden): World War I: The barque was sunk in the North Sea by SMU U-57.
 * SS Snetinden (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean north west of Spain (45.58333°N, -11.16667°W) by SMU U-22 (Germany) . Her crew survived.
 * HMT Thomas Stratten : World War I: The naval trawler struck a mine and sank in the Atlantic Ocean off the Butt of Lewis, Outer Hebrides with the loss of eight crew.
 * Virginia Gentile ( undefined): World War I: The sailing vessel was scuttled in the Malta Channel by SMU UC-25.
 * HMT Vitality : World War I: The naval trawler struck a mine and sank in the North Sea off Lowestoft, Suffolk with the loss of two of her crew.

21 October

 * SS Anglo Dane (1866) (🇩🇰 Denmark): World War I: The coaster struck a mine and sank in the North Sea 0.75 nmi off the Bressay Lighthouse, Shetland Islands, United Kingdom with the loss of a crew member.
 * Bunty ( undefined): World War I: The tug struck a mine and sank in the North Sea off Whitby, Yorkshire with the loss of five of her crew.
 * SS Flynderborg (1901) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the North Sea 3 nmi south east of the Bressay Lighthouse by SMU UC-40 . Her crew survived.
 * SS Gryfevale (1906) ( undefined): World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 10 nmi off Cap Blanc, Mauritania (21.13333°N, -17.06667°W) by SMU U-151 . Her crew survived.
 * HMS Marmion (1915) : The Admiralty M-class destroyer collided with HMS Tirade (1917) and sank off the Shetland Islands.
 * SMS T66 : World War I: The S66-class torpedo boat struck a mine and was damaged in the North Sea off the Belgian coast. She was consequently found to be a total loss.
 *  Tom Roper ( undefined): World War I: The topsail schooner was scuttled in the English Channel 20 nmi south south east of Start Point by SMU UC-79 with the loss of a crew member.

22 October

 * HMS C32 : World War I: The C-class submarine ran aground in the Gulf of Riga and was scuttled.
 * SS Novillo (1895) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the North Sea 8 nmi north of Scarborough, Yorkshire, United Kingdom by SMU UB-57 with the loss of four crew.
 * SS Zillah (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Barents Sea 25 nmi north east of Kildin Island, Russia by SMU U-46 with the loss of eighteen crew.

23 October

 * SS Capo di Monte (1917) ( undefined): World War I: The cargo ship was sunk in the Mediterranean Sea 100 nmi west of Heraklion, Crete, Greece (34.88333°N, 19.83333°W) by SMU U-14 (Austria-Hungary).
 * HMT Earl Lennox : World War I: The naval trawler struck a mine and sank south of Islay Sound (55.75°N, -5.95°W) with the loss of seven crew.
 * SS Perim (1877) ( undefined): The cargo ship collided with another British merchant ship and sank in the Mediterranean Sea off Barcelona, Spain.
 * SS Seistan (1907) ( undefined): World War I: The collier was torpedoed and sunk in the North Sea 3.5 nmi north by west of Flamborough Head, Yorkshire (54.15°N, -0.13333°W) by SMU UB-57 with the loss of five of her crew.
 * SS Tredegar Hall (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 4.5 nmi east south east of Flamborough Head by SMU UB-57 with the loss of three of her crew.

24 October

 * SS Gallia (1887) ( undefined): World War I: The cargo ship was sunk in the English Channel 24 nmi west north west of Portland Bill, Dorset, United Kingdom by SMU UB-40 . Her crew survived.
 * SS Ilderton (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Barents Sea 35 nmi north east of Kildin Island, Russia (69.76667°N, 35.4°W) by SMU U-46 . Her crew survived.
 * SS Novington (1912) ( undefined): World War I: The cargo ship was torpedoed and damaged in the North Sea 25 nmi east of Bard Island, Shetland Islands by SMU UC-40 . She was beached but was later refloated.
 * SS Ulfsborg (1894) (🇩🇰 Denmark): World War I: The cargo ship was sunk in the Bay of Biscay (46.05°N, -1.71667°W) by SMU UC-63 with the loss of seventeen of her crew.
 * SS Woron (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 25 nmi north east of Lerwick, Shetland Islands by SMU UC-40.

25 October

 * SMS A32 : The A25-class torpedo boat ran aground and sank in the Baltic Sea.
 * SS Erviken (1895) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 4 nmi south east of Cabo de Gata, Spain by SMU U-64 (Germany) with the loss of a crew member.
 * SS Euston (1910) ( undefined): World War I: The collier was torpedoed and sunk in the Mediterranean Sea 37 nmi south west of Cape Matapan, Greece (35.55°N, 21.8°W) by SMU UC-34 with the loss of a crew member.
 *  Fannie Prescott (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean 50 nmi south of Cape Cantin, Morocco by SMU U-35 (Germany).
 * SS Gefion (1914) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 10 nmi north east of Berry Head, Devon by SMU UB-40 with the loss of two of her crew.
 * SS Ness (1896) ( undefined): World War I: The cargo ship was shelled and sunk in the Mediterranean Sea 10 nmi south east of Cabo de Gata by SMU U-64 (Germany) with the loss of two of her crew.
 * SS Sheaf Blade (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 13 nmi south east by south of Cabo de Gata by SMU U-64 (Germany) with the loss of two of her crew.
 * SS Wearside (1899) ( undefined): World War I: The cargo ship struck a mine and sank in the North Sea 3 nmi off the Sunk Lightship ( undefined). Her crew survived.

26 October

 * SS Le Tarn (1889) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea east of Oran, Algeria (36.25°N, -0.05°W) by SMU U-64 (Germany) . Her crew survived.
 * SS Sapele (1904) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 100 nmi north west of Tory Island, County Donegal (55.93333°N, -11°W) by SMU U-104 with the loss of three crew.
 * SMS T65 : World War I: The S7-class torpedo boat struck a mine and sank in the Baltic Sea.

27 October

 * SS D. N. Luckenbach (1883) (🇺🇸 United States): World War I: The cargo ship was sunk in the Atlantic Ocean (46.56667°N, -8.56667°W) by SMU U-93 with the loss of five of her crew.
 * SS Lady Helen (1909) ( undefined): World War I: The coaster was sunk in the North Sea off Robin Hood's Bay, Yorkshire by SMU UB-34 with the loss of seven of her crew.
 * HMT Strymon : World War I: The naval trawler struck a naval mine and sank in the North Sea off the Shipwash Lightship ( undefined) (51.61667°N, 0.8°W) with the loss of eleven of her crew.

28 October

 * SS Baron Balfour (1901) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Barents Sea 8 nmi north of Sem Island, Russia by SMU U-46 . Her crew survived.
 * SS Baron Garioch (1895) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 5 nmi south east of Anvil Point, Dorset (50.6°N, -1.71667°W) by SMU UC-63 with the loss of two of her crew.
 * SS Ferrona (1914) ( undefined): World War I: The cargo ship was scuttled in the Mediterranean Sea 7 nmi north east of Valencia, Spain (39.46667°N, -0.16667°W) by SMU U-64 (Germany) with the loss of a crew member.
 * USAT Finland (U.S. Army): World War I: The troopship was torpedoed and damaged in the Atlantic Ocean 150 nmi off Brest, Finistère, France (46.35°N, -6.5°W) by SMU U-93 with the loss of nine of her crew.
 * SS Marc Fraissinet (1901) (🇫🇷 France): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 15 nmi north of Tabarka, Tunisia (37.01667°N, 8.61667°W) by SMU UB-50 with the loss of a crew member.
 * SS Redesmere (1911) ( undefined): World War I: The collier was torpedoed and sunk in the English Channel 6 nmi west south west of St. Catherine's Point, Isle of Wight by SMU UB-40 with the loss of nineteen of her crew.
 * SS Senegal (1875) ( undefined): World War I: The coaster was torpedoed and sunk in the Mediterranean Sea south of Sardinia (37.96667°N, 8.95°W) by SMU UB-50 with the loss of two of her crew.

29 October

 * SS Marne (1907) (🇫🇷 France): World War I: The coaster was sunk in the English Channel 25 nmi north east of Barfleur, Manche (50.5°N, -1.33333°W) by SMU UC-63.
 * SS Namur (1906) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Mediterranean Sea 55 nmi east by south of Gibraltar (36°N, -4.25°W) by SMU U-35 (Germany) with the loss of a crew member.
 *  La Epocha (🇺🇾 Uruguay): World War I: The barque was scuttled in the Bay of Biscay 30 nmi south west of the Cordouan Lighthouse, Gironde, France by SMU U-93.

30 October

 * SS Liff (1913) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Bay of Biscay 70 nmi west of Penmarc'h, Finistère, France (47.61667°N, -5.21667°W) by SMU U-93 . Her crew survived.

31 October

 * SS Cambric (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 14 nmi west of Cape Cherchell, Spain by SMU U-35 (Germany) with the loss of 24 crew.
 * SS Estrellano (1910) ( undefined): World War I: Convoy T 340: The cargo ship was torpedoed and sunk in the Bay of Biscay 14 nmi west by north of the Île du Pilier, Vendée, France (47.06667°N, -2.66667°W) by SMU UC-71 with the loss of three of her crew. Survivors were rescued by FRENCH TRAWLER La Batailleuse.
 * Evangelistra (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Mediterranean Sea east of Crete (35.81667°N, 24.08333°W) by SMU UC-37.
 * SS North Sea (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 2.5 nmi south west of Prawle Point, Devon by SMU UC-65 with the loss of a crew member.
 * SS Phare (1906) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 2.5 nmi north of Scarborough, Yorkshire by SMU UB-35 with the loss of fourteen of her crew.
 * South Bay (🇺🇸 United States): The dredger foundered in the Atlantic Ocean off Tampico, Florida.

Unknown date

 * HMS Begonia (1915) : The Azalea-class sloop, in use as a Q-ship, collided with SMU U-151  and sank in the Mediterranean Sea off Casablanca, Morocco on 2 or 12 October.
 * SS Toledo ( undefined): World War I: The cargo ship was scuttled in the Baltic Sea to avoid capture by the Germans.
 * SMU UC-16 : World War I: The Type UC II submarine struck a mine and sank in the North Sea off Zeebrugge, West Flanders, Belgium with the loss of all 26 crew.