List of shipwrecks in August 1918

The list of shipwrecks in August 1918 includes ships sunk, foundered, grounded, or otherwise lost during August 1918.

1 August

 * SS Columbia (1915) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea off Port Said, Egypt by SMU UC-34 with the loss of a crew member.

2 August

 * HMS Ariel (1911) : World War I: The Acheron-class destroyer struck a mine at the western end of the Heligoland Bight and sank with the loss of 49 of her 70 crew.
 *  Dornfontein (🇨🇦 Canada): World War I: The four-masted auxiliary schooner was set afire in the Atlantic Ocean 25 nmi west north west of Brier Island, Nova Scotia by SMU U-156 . She was towed in to port but was a total loss.
 * Flevo X (🇳🇱 Netherlands): World War I: The sailing vessel was sunk in the North Sea 40 nmi east of the Shipwash Lightship ( undefined) by SMU UB-104.
 * FRENCH SUBMARINE Floréal : The Pluviose-class submarine collided with HMS Hazel and sank in the Aegean Sea.
 * SS Malvina (1879) ( undefined): The cargo ship sank in the North Sea 1 nmi north north east of Flamborough Head, Yorkshire with the loss of fourteen of her crew.
 * SS Portugal (1909) (🇧🇪 Belgium): World War I: The cargo ship was sunk in the Atlantic Ocean 4 nmi west north west of Trevose Head, Cornwall, United Kingdom (50.53333°N, -5.11667°W) by SMU U-113.
 * Remke (🇳🇱 Netherlands): World War I: The sailing vessel was shelled and sunk in the North Sea 55 nmi west north west of the Hoek van Holland, South Holland by SMU UB-104.
 * HMT Scania : The naval trawler was lost on this date.
 * SS Tokuyama Maru (1915) (🇯🇵 Japan): World War I: The cargo ship was sunk in the Atlantic Ocean off the east coast of the United States (39.2°N, -70.38333°W) by SMU U-140.
 * HMS Vehement (1917) : World War I: The V and W-class destroyer struck a mine in the Heligoland Bight and was consequently scuttled.

3 August

 *  Annie Perry (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean 40 nmi off Seal Island, Nova Scotia, Canada by SMU U-156 . Her crew survived.
 * SS Berwind (1893) (🇺🇸 United States): World War I: The cargo shp was sunk in the English Channel off Audierne, Manche, France (47.91667°N, -4.46667°W) by SMU UB-88 with the loss of six of her crew.
 * SS Cambrai (1875) (🇫🇷 France): World War I: The coaster was torpedoed and sunk in the North Sea 2 nmi east of Flamborough Head, Yorkshire, United Kingdom by SMU UB-104 with the loss of 25 of her crew.
 * SS Chrysolite ( undefined): The cargo ship collided with SS Geraint ( undefined) in the Bristol Channel off Morte Point, Devon and sank.
 * SS Lake Portage (1898) (🇺🇸 United States): World War I: The cargo ship was sunk in the English Channel 4.5 nmi south of Audierne (47.93333°N, -4.73333°W) by SMU UB-88 with the loss of three of her crew.
 *  Ludvig (🇩🇰 Denmark): World War I: The schooner was shelled and sunk in the North Sea east of the Shetland Islands, United Kingdom (60.58333°N, 3.68333°W) by SMU UB-120 . Her crew survived.
 * SS Maceio (1910) (🇧🇷 Brazil): World War I: The cargo ship was sunk in the Atlantic Ocean off Cape Ortegal, Spain (45.03333°N, -10.45°W) by SMU U-43 (Germany) . Her crew survived.
 * Muriel (🇺🇸 United States): World War I: The fishing vessel was scuttled in the Atlantic Ocean 45 nmi west by north of Seal Island by SMU U-156 . Her crew survived.
 * Rob Roy (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean 35 nmi east of Seal Island by SMU U-156 . Her crew survived.
 *  Skjold (🇩🇰 Denmark): World War I: The three-masted schooner was shelled and damaged in the North Sea off Lindesnes, Rogaland, Norway by SMU UC-40 and was abandoned by her crew. The derelict vessel was sunk on 12 September by SMU UB-125.
 * Sydney B. Atwood (🇺🇸 United States): World War I: The ship was sunk in the Atlantic Ocean 30 nmi off Seal Island by SMU U-156.
 * SMU UB-53 : World War I: The Type UB III submarine struck two mines and sank in the Strait of Otranto (39.66667°N, 18.66667°W) with the loss of ten of her crew.
 *  Vouga (🇵🇹 Portugal): World War I: The schooner was scuttled in the Atlantic Ocean north west of Spain (45.66667°N, -10.46667°W by SMU U-43 (Germany).
 * HMAT Warilda : World War I: The hospital ship was torpedoed and sunk in the English Channel 32 nmi south south west of the Owers Lightship ( undefined) (50.16667°N, -0.21667°W) by SMU UC-49 with the loss of 123 of the 801 people on board.

4 August

 * SS Clan Macnab (1905) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 14 nmi north north west of the Pendeen Lighthouse, Pembrokeshire (50.33333°N, -5.91667°W) by SMU U-113 with the loss of 22 crew.
 *  Don (🇳🇴 Norway): World War I: The barque was sunk in the Atlantic Ocean 350 nmi west of the Skellig Islands (50.73333°N, -16.35°W) by SMU U-157 . Her crew survived.
 * SS Hundvaagø (1915) (🇳🇴 Norway): World War I: The cargo ship was torpedoed and sunk in the Bay of Biscay 2 nmi off Groix, Finistère by SMU UB-88 with the loss of three of her crew.
 *  Nelson A. ( undefined): World War I: The schooner was scuttled in the Atlantic Ocean 25 nmi south of Shelburne, Nova Scotia, Canada by SMU U-156 . Her crew survived.
 * SS O. B. Jennings (1917) (🇺🇸 United States): World War I: The tanker was sunk in the Atlantic Ocean 100 nmi off the coast of Virginia (36.66667°N, -73.96667°W) by SMU U-140 with the loss of two crew. One of the survivors was taken as a prisoner of war.
 *  Reinhard (Flag of Russian SFSR.svg Russia): World War I: The schooner was shelled and sunk in the Irish Sea north east of Ireland (55.45°N, -6.75°W) by SMU U-96.
 *  Remonstrant (🇳🇴 Norway): World War I: The barque was sunk in the Atlantic Ocean 280 nmi west of the Fastnet Rock (50.5°N, -18°W) by SMU U-157 . Her crew survived.

5 August

 * Agnes G. Holland (🇺🇸 United States): World War I: The trawler was sunk in the Atlantic Ocean by SMU U-156.
 * SS Freshfield (1896) (🇨🇦 Canada): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 4 nmi north east by nort of Capo Colonna, Calabria, Italy by SMU UC-25 with the loss of three of her crew.
 * SS Luz Blanca (1913) (🇨🇦 Canada): World War I: The tanker was torpedoed and sunk in the Atlantic Ocean 35 nmi off Halifax, Nova Scotia by SMU U-156 with the loss of two of her crew.
 * Stanley M. Seaman (🇺🇸 United States): World War I: The sailing vessel was scuttled in the Atlantic Ocean 110 nmi east of Cape Hatteras, Virginia by SMU U-140 . Her crew survived.

6 August

 * SS Biruta ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 8 nmi nort west of Calais, France by a Kaiserliche Marine submarine with the loss of twelve of her crew.
 * SS Clan Macneil (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 10 nmi north of Alexandria, Egypt (31.35°N, 29.78333°W) by SMU UC-34 . Her crew survived.
 * HMS Comet (1910) : The Acorn-class destroyer collided with another vessel and sank in the Mediterranean Sea.
 *  Diamond Shoal Lightship No. 71 : World War I: The Lightship was torpedoed and sunk in the Atlantic Ocean by SMU U-140 . Her crew survived.
 * SS Merak (1910) (🇺🇸 United States): World War I: The cargo ship was sunk in the Atlantic Ocean off Cape Hatteras, North Carolina (34.95°N, -75.66667°W) by SMU U-140 . Her crew survived.

7 August

 * FRENCH ARMOURED CRUISER Dupetit-Thouars : World War I: The Gueydon-class cruiser was torpedoed and sunk in the Atlantic Ocean 400 nmi west of Brest, Finistère by SMU U-62 . Her crew survived.
 * SS Highland Harry (1904) ( undefined): World War I: The cargo liner was torpedoed and sunk in the Atlantic Ocean 83 nmi north by west of Eagle Island, County Mayo (55.46667°N, -11.25°W) by SMU U-96 with the loss of 24 lives.
 * SS Lorna (1897) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 300 nmi west of Ouessant, Finistère (47°N, -12°W) by SMU U-62 . Her crew survived.

8 August

 * SS Clan Macvey (1918) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 0.5 nmi off Anvil Point, Dorset by SMU UB-57 with the loss of seven of her crew.
 * HMT Michael Clements : The naval trawler was rammed and sunk in the English Channel off St. Catherine's Point, Isle of Wight by HMT John Cattling . Her crew survived.
 * SS Sydland (1905) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the Atlantic Ocean 100 nmi off the Nantucket Lightship (43.5°N, -65.38333°W) by SMU U-156 . Her crew survived.
 * SMU UC-49 : World War I: The Type UC II submarine was depth charged and sunk in the English Channel off Start Point, Cornwall, (50.33333°N, -3.5°W) United Kingdom by HMS Opossom (1895) with the loss of all 31 crew.
 * SMS V68 : World War I: The V25-class destroyer struck a mine and sank in the North Sea off the coast of Belgium with the loss of eighteen of her crew.

9 August

 *  Emma (Flag of Russian SFSR.svg Russia): World War I: The three-masted schooner was sunk in the Skagerrak 37 nmi off Ryvingen, Rogaland, Norway (57.48333°N, 8.15°W) by SMU UB-89.
 * Girola Ciolino ( undefined): World War I: The sailing vessel was sunk in the Malta Channel (36.3°N, 13.56667°W) by SMU UC-22.
 * SS Glenlee (1918) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 4 nmi east of the Owers Lightship ( undefined) by SMU UB-57 with the loss of a crew member.
 *  Orkney (🇩🇰 Denmark): World War I: The barque was scuttled in the Atlantic Ocean west of Gibraltar (39.83333°N, -17.78333°W) by SMU U-157 with the loss of five crew.

10 August

 * Aleda May (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-117 . Her crew survived.
 * Cruiser (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * Earl & Nettie (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * Katie L. Palmer (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * SS Madame Renee (1904) ( undefined): World War I: The coaster was torpedoed and sunk in the North Sea 1 nmi north north east of Scarborough, Yorkshire by SMU UB-30 with the loss of ten of her crew.
 * Mary E. Sennett (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * Patra (🇫🇷 France): World War I: The sailing vessel was sunk in the Mediterranean Sea off the Egyptian coast by SMU UC-34.
 * SS Polynesien (1890) (🇫🇷 France): World War I: The troopship was torpedoed and sunk in the Mediterranean Sea 7 nmi off Valletta, Malta by SMU UC-22 with the loss of nineteen lives.
 * Progress (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * Reliance (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.
 * SS Tatarrax (1914) ( undefined): World War I: The tanker was torpedoed and sunk in the Mediterranean Sea off Rosetta, Egypt (32°N, 30.75°W) by SMU UC-34 with the loss of 61 lives.
 * William H. Starbuck (🇺🇸 United States): World War I: The fishing vessel was sunk in the Atlantic Ocean (41.75°N, -67.16667°W) by SMU U-113 . Her crew survived.

11 August

 * SS City of Adelaide (1917) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 60 nmi east north east of Malta (36.43333°N, 15.61667°W) by SMU U-63 (Germany) with the loss of four crew.
 * HM CMB-40 : The Coastal Motor Boat was lost on this date.
 * HM CMB-42 : The Coastal Motor Boat was lost on this date.
 * HM CMB-47 : The Coastal Motor Boat was lost on this date.
 * SS Penistone (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 145 nmi south west of Nantucket, Massachusetts, United States (39.83333°N, -67.5°W) by SMU U-156 with the loss of a crew member.

12 August

 * ITALIAN TRAWLER G6 : World War I: The naval trawler was torpedoed and sunk in the Mediterranean Sea south east of Sicily by SMU U-63 (Germany).
 * SS Sommerstad (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean 30 nmi south east of the Fire Island Lightship (40°N, -69°W) by SMU U-113 . Her crew survived.

13 August

 * SS Anhui (1903) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Mediterranean Sea 2 nmi south east of Capo Greco, Cyprus (35.06667°N, 34.13333°W) by SMU U-27 (Austria-Hungary) with the loss of four of her crew.
 * SS City of Brisbane (1918) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 1.5 nmi south of Newhaven, East Sussex by SMU UB-57 . Her crew survived.
 * ITALIAN CRUISER Etruria (: The Umbria-class cruiser was destroyed at Livorno by the explosion of an ammunition barge moored alongside her.
 *  Frida (🇩🇰 Denmark): World War I: The barque was shelled and sunk in the North Sea 40 nmi east of the mouth of the River Tyne by SMU UB-104 with the loss of seven of her crew.
 * SS Jönköping (1881) (🇸🇪 Sweden): World War I: The cargo ship was sunk in the North Sea off Robin Hood's Bay, Yorkshire, United Kingdom by SMU UB-104 . The ship broke in two, with the bow section sinking and the stern section being beached at South Shields, County Durham where it was scrapped in 1919. Her crew survived.
 * SS La Chaussade (1897) (🇫🇷 France): World War I: The cargo ship was sunk in the Mediterranean Sea off La Galite, Tunisia by SMU UC-27 withn the loss of four of her crew.
 * SMS T67 : World War I: The S66-class torpedo boat struck a mine and sank in the North Sea with the loss of two of her crew.
 * SMU UB-30 : World War I: The Type UB II submarine was depth charged and sunk in the North Sea 3 nmi north north east of Whitby, Yorkshire, United Kingdom (54.53333°N, 0.6°W) with the loss of all 26 crew.

14 August

 *  Dorothy B. Barrett (🇺🇸 United States): World War I: The five-masted schooner was shelled and sunk in the Atlantic Ocean 6.5 nmi off the North East End Lightship (38.9°N, -74.56667°W) by SMU U-113 . Her crew survived.
 * SMU UB-57 : World War I: The Type UB III submarine struck a mine and sank in the North Sea off the Belgian coast and sank with the loss of all 34 crew.
 * SMU UB-103 : World War I: The Type UB III submarine departed Zeebrugge, West Flanders, Belgium on patrol. She subsequently struck a mine and sank with the loss of all 37 crew.
 * SS Wallsend (1917) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 1 nmi south east of Robin Hood's Bay, Yorkshire by SMU UB-104 . Her crew survived.

15 August

 * SS Balkan (🇫🇷 France): World War I: The ship was torpedoed and sunk in the Mediterranean Sea. There were at least 102 survivors.
 * SS Cubore (1917) (🇺🇸 United States): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 250 nmi north west of Cape Finisterre, Spain (46.86667°N, -12°W) by SMU U-107 with the loss of nine crew.
 * J. M. J. (🇫🇷 France): World War I: The fishing vessel was sunk in the Atlantic Ocean west of Ouessant, Finistère by SMU U-90.
 * Kalps (Flag of Russian SFSR.svg Russia): World War I: The sailing vessel was scuttled in the Atlantic Ocean off Lisbon, Portugal (37.95°N, -18.45°W) by SMU U-157.
 *  Madrugada (🇺🇸 United States): World War I: The five-masted auxiliary schooner was sunk in the Atlantic Ocean 35 nmi off Norfolk, Virginia (37.83333°N, -74.91667°W) by SMU U-113 . Her crew survived.
 * HMS Scott (1917) : World War I: The Admiralty type destroyer leader struck a mine and sank in the North Sea off Ijmuiden, North Holland Netherlands (52.4°N, 3.85°W) with the loss of 22 of her crew.
 * HMS Ulleswater : World War I: The R-class destroyer struck a mine and sank in the North Sea off IJmuiden (52.4°N, 3.85°W with the loss of five of her crew. by SMU UC-17 . Her crew survived.

16 August

 * SMS A58 : World War I: The A56-class torpedo boat struck a mine and sank in the North Sea off the coast of Belgium with the loss of three of her crew.
 * SS Balkan (1882) (🇫🇷 France): World War I: The troopship was torpedoed and sunk in the Mediterranean Sea 7 nmi north west of Île Rousse, Corsica (42.66667°N, 8.65°W) by SMU UB-48 with the loss of approximately 400 lives.
 * SS Mirlo (1917) ( undefined): World War I: The tanker was torpedoed and sunk in the Atlantic Ocean off Cape Hatteras, Virginia, United States by SMU U-113 with the loss of nine crew.
 * SS West Bridge (1918) (🇺🇸 United States): World War I: The cargo ship was torpedoed and severely damaged in the Bay of Biscay by SMU U-90 with the loss of four of her crew. She was abandoned by the survivors but was later towed into Brest, Finistère, France.

17 August

 * SS Denebola (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the English Channel 2 nmi north west of Gurnard's Head, Isle of Wight (50.21667°N, -5.61667°W) by SMU UB-86 with the loss of two of her crew.
 * SS Eros (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 9 nmi south east of Scarborough, Yorkshire by SMU UB-113 with the loss of seven of her crew.
 * SS Escrick (1910) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 360 nmi north west by north of Cape Finisterre, Spain (46.4°N, -16.16667°W) by SMU U-90 with the loss of a crew member. Her captain was taken as a prisoner of war.
 * SS Helene (1896) (🇩🇰 Denmark): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 6 nmi north west by north of St Ives, Cornwall, United Kingdom (50.28333°N, -5.6°W) by SMU UB-86 with the loss of a crew member.
 * SS Joseph Cudahy (1917) (🇺🇸 United States): World War I: The tanker was sunk in the Atlantic Ocean 370 nmi north west by north of Cape Finisterre (46.58333°N, -13.9°W) by SMU U-90 with the loss of a crew member.
 * SS Moghram (🇧🇪 Belgium): The tanker was wrecked in Poro Bay, Crete by the explosion of petrol from SS Monastir (flag unknown), which she was involved in salvaging.
 *  Nordhav (🇳🇴 Norway): World War I: The four-masted barque was sunk in the Atlantic Ocean 120 nmi north east of Cape Henry, Virginia, United States by SMU U-113 . Her crew survived.
 * SS San Jose (1912) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean (42.16667°N, -64.7°W) by SMU U-156 . Her crew survived.

18 August

 * SS Gasconier (🇧🇪 Belgium): World War I: The cargo ship struck a mine in the North Sea off Udsire, Rogaland, Norway and sank.
 * SS Idaho (1899) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 120 nmi north by west of Cape Villano, Spain by SMU U-107 with the loss of eleven crew.
 * USAT Montanan : World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 500 nmi west of Le Verdon-sur-Mer, Gironde, France (46.78333°N, -13.7°W) by SMU U-90 with the loss of five of the 86 people on board. Survivors were rescued by USS Moma (SP-131).
 * SS Nordboen (1896) (🇩🇰 Denmark): World War I: The cargo ship was scuttled in the Mediterranean Sea 30 nmi off Palamos, Spain (41.33333°N, 3.8°W) by SMU UB-48 . Her crew survived.

19 August

 * Buoni Amici (🇵🇹 Portugal): World War I: The sailing vessel was scuttled in the Atlantic Ocean 45 nmi off Viana do Castelo by SMU U-22 (Germany).
 * SS Marie Suzanne (1905) ( undefined): World War I: The collier was torpedoed and sunk in the Aegean Sea 47 nmi south west of Mudros, Greece by SMU UC-37 . Her crew survived.
 * SMU UB-12 : World War I: The Type UB I submarine departed from Zeebrugge, West Flanders, Belgium on patrol. No further trace, lost with all fourteen crew.
 * SS Zinal (1912) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 360 nmi north by east of Terceira, Azores, Portugal by SMU UB-109 with the loss of two of her crew.

20 August

 *  A. Piatt Andrew (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean 60 nmi off the coast of Nova Scotia, Canada by GERMAN TRAWLER Triumph . Her crew survived.
 * SS Boltonhall (1900) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 34 nmi south west by west of Bardsey Island, Pembrokeshire by SMU UB-92 with the loss of fiver of her crew.
 *  Frances J. O'Hara Jr. (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean 60 nmi off the coast of Nova Scotia by GERMAN TRAWLER Triumph . Her crew survived.
 * SS Kite ( undefined): The cargo ship came ashore at Cape Rosie, Newfoundland and was a total loss.
 *  Lucille M. Schnare (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 52 nmi south of Cape Canso, Nova Scotia by GERMAN TRAWLER Triumph . Her crew survived.
 * Magalhaes Lima (🇵🇹 Portugal): World War I: The trawler was scuttled in the Atlantic Ocean 13 nmi off Nazaré by SMU U-22 (Germany).
 * SS Otis Tetrax ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 28 nmi south of Flamborough Head, Yorkshire by a Kaiserliche Marine submarine.
 *  Pasadena (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 70 nmi south south east of Cape Canso by SMU U-156 . Her crew survived.
 * HMT Strathmore : The naval trawler was lost on this date.
 *  Uda A. Saunders (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 60 nmi south of Cape Canso by GERMAN TRAWLER Triumph . Her crew survived.

21 August

 * SS Boscawen (1909) ( undefined): World War I: The collier was shelled and sunk in the Irish Sea 23 nmi west north west of Bardsey Island, Pembrokeshire (52.76667°N, -5.4°W) by SMU UB-92 with the loss of a crew member.
 * SS Champlain (1913) (🇫🇷 France): World War I: The cargo liner was torpedoed and sunk in the Atlantic Ocean 124 nmi west of Cape Mondego, Portugal (40.16667°N, -11.7°W) by SMU UB-128 . Her crew survived, but her captain was taken as a prisoner of war.
 * SS Diomed (1917) ( undefined): World War I: The cargo ship was shelled and sunk in the Atlantic Ocean 195 nmi east south east of Nantucket, Massachusetts, United States by SMU U-140 with the loss of two crew.
 *  Hecla (🇳🇴 Norway): World War I: The barge was shelled and sunk in the North Sea 102 nmi east north east of Coquet Island, Northumberland, United Kingdom by SMU UC-59 . Her crew survived.
 * SS Lake Edon (1918) (🇺🇸 United States): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 4 nmi north by east of Newquay, Cornwall, United Kingdom (50.45917°N, -5.12611°W) by SMU U-107 with the loss of sixteen crew.
 * ST Loeke (🇳🇴 Norway): World War I: The tug was shelled and sunk in the North Sea 102 nmi east north east of Coquet Island by SMU UC-59 . Her crew survived.
 *  Sylvania (🇺🇸 United States): World War I: The schooner was scuttled in the Atlantic Ocean 90 nmi south east of Cape Canso, Nova Scotia, Canada by GERMAN TRAWLER Triumph . Her crew survived.
 * SS The Stewart's Court (1909) ( undefined): World War I: The coaster was torpedoed and sunk in the North Sea 4 nmi south south east of Seaham, County Durham by SMU UB-112 with the loss of a crew member.

22 August

 * Abbasieh (🇪🇬 Egypt): World War I: The sailing vessel was shelled and sunk in the Mediterranean Sea by an enemy submarine.
 *  Maria Luisa (🇵🇹 Portugal): World War I: The schooner was sunk in the Atlantic Ocean off the coast of Portugal by SMU U-22 (Germany).
 * HMML 403 : The motor launch was lost on this date.
 *  Notre Dame de la Garde (🇫🇷 France): World War I: The topsail schooner was scuttled in the Atlantic Ocean 90 nmi off Sydney, Nova Scotia, Canada (45.53333°N, -58.95°W) by GERMAN TRAWLER Triumph and SMU U-156 (both ). Her crew survived.
 * SS Palmella (1913) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Irish Sea 25 nmi north west of South Stack (53.46667°N, -5.33333°W) by SMU UB-92 with the loss of 28 of her crew.
 * SS Prunelle (1874) ( undefined): World War I: The coaster was torpedoed and sunk in the North Sea 2 nmi south east of Blyth, Northumberland by SMU UB-112 with the loss of twelve of her crew.

23 August

 * SMS A19 : World War I: The A1-class torpedo boat was shelled and sunk in the North Sea off the coast of Belgium by Royal Navy destroyers with the loss of nineteen of her crew.
 * SS Australian Transport (1911) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Strait of Sicily (40 nmi) west north west of Maritimo Island, Italy (38.13333°N, 11.16667°W) by SMU UC-27 with the loss of a crew member.
 * SS Heros (1884) (🇸🇪 Sweden): World War I: The coaster was sunk in the North Sea 6 nmi south of Warkworth, Northumberland, United Kingdom by SMU UB-112 . Her crew survived.
 * HMT Tulip II : The naval trawler was lost on this date.

24 August

 * SS Auckland Castle (1883) ( undefined): World War I: The cargo ship was torpedoed and sunk in the North Sea 5 nmi east by south of the Farne Islands, Northumberland by SMU UC-59 with the loss of twelve of her crew.
 * SS Flavia (1902) ( undefined): World War I: The passenger ship was torpedoed and sunk in the Atlantic Ocean 30 nmi north west by west of Tory Island, County Donegal (55.38333°N, -9.66667°W) by SMU U-107 with the loss of one life.
 *  Graciosa (🇵🇹 Portugal): World War I: The four-masted barque was shelled and sunk in the Atlantic Ocean north west of Scotland (59.1°N, -5°W) by SMU U-67 and SMU U-90 (both ). Her crew survived.
 * Hollandia (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk, United Kingdom by SMU UB-111 . Her crew survived.
 * SS Lisbonense (🇵🇹 Portugal): The cargo ship struck a floating object and sank in the Mediterranean Sea 40 nmi off the Sisargas Islands, Spain. Fourteen crew were rescued.
 * Majoor Thompson (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk by SMU UB-111 . Her crew survived.
 * Maria Johanna (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk by SMU UB-111 . Her crew survived.
 * Neerlandia II (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk by SMU UB-111 . Her crew survived.
 * Neerlandia III (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk by SMU UB-111 . Her crew survived.
 * Secunda (🇳🇱 Netherlands): World War I: The fishing vessel was sunk in the North Sea off the coast of Norfolk by SMU UB-111.
 * Stella (🇳🇱 Netherlands): World War I: The fishing vessel was scuttled in the North Sea off the coast of Norfolk by SMU UB-111 . Her crew survived.
 * SS Virent (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 38 nmi off the Smalls Lighthouse by SMU UB-92 . Her crew survived.

25 August

 * SS Carasa (1911) (🇪🇸 Spain): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 4 nmi north of Towan Head, Cornwall, United Kingdom (50.48333°N, -5.11667°W) by SMU UB-92 with the loss of six of her crew.
 *  Clayton W. Walters (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 35 nmi west south west of Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 *  C. M. Walters (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 35 nmi west of Langlade Island, Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 *  E. B. Walters (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 35 nmi west of Langlade Island by SMU U-156 . Her crew survived.
 * SS Erik (1865) ( undefined): World War I: The coaster was scuttled in the Atlantic Ocean 70 nmi north west by west of Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 *  J. J. Flaherty (🇺🇸 United States): World War I: The schooner was sunk in the Atlantic Ocean 35 nmi west south west of Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 * Marion Adams (🇨🇦 Canada): World War I: The fishing vessel was scuttled in the Atlantic Ocean off Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 * SS Pontet Canet (1905) (🇫🇷 France): World War I: The cargo ship was sunk in the English Channel 12 nmi north north west of the Héaux de Bréhat Lighthouse, Côtes-du-Nord (49.11667°N, -3.08333°W) by SMU UB-109.
 *  Verna D. Adams (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 35 nmi west south west of Saint-Pierre and Miquelon by GERMAN TRAWLER Triumph . Her crew survived.
 * SS Willingtonia (1918) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Strait of Sicily 13 nmi south west by west of Maritimo Island, Italy (37.81667°N, 11.16667°W) by SMU UC-27 with the loss of four of her crew.

26 August

 * Evaangtelistria (🇬🇷 Greece): World War I: The sailing vessel was sunk in the Aegean Sea (39.18333°N, 25.25°W) by SMU UC-37.
 *  Gloaming (🇨🇦 Canada): World War I: The schooner was scuttled in the Atlantic Ocean 70 nmi south south west of Saint-Pierre and Miquelon by SMU U-156 . Her crew survived.
 * SS Helge (1877) (🇸🇪 Sweden): World War I: The cargo ship was torpedoed and sunk in the English Channel off Saint-Brieuc, Côtes du Nord, France (48.81667°N, -2.75°W by SMU UB-109 with the loss of thirteen of her crew.
 * Rush (🇺🇸 United States): World War I: The fishing vessel was scuttled in the Atlantic Ocean 135 nmi south east of Cape Canso, Nova Scotia, Canada (44.5°N, -58.03333°W) by SMU U-113 . Her crew survived.

27 August

 * SS Ant Cassar (1902) ( undefined): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean 30 nmi north north west of Strumble Head, Cornwall (52.41667°N, -5.75°W) by SMU UB-118 . Her crew survived.
 * SS Bergsdalen (1900) (🇳🇴 Norway): World War I: The cargo ship was sunk in the Atlantic Ocean (45.16667°N, -55.16667°W) by SMU U-113 with the loss of a crew member.
 *  Gloria (🇵🇹 Portugal): World War I: The schooner was scuttled in the Atlantic Ocean 30 nmi off Porto Santo Island, Madeira (33.4°N, -16.46667°W) by SMU U-157 . Her crew survived.
 * SS Pampa (1906) (🇫🇷 France): World War I: The troopship was sunk in the Mediterranean Sea 84 nmi east of Valletta, Malta by SMU UC-22 with the loss of 117 lives.

28 August

 * Emilia G. ( undefined): World War I: The sailing vessel was scuttled in the Mediterranean Sea off Cape Palos, Spain (37.5°N, -0.58333°W) by SMU U-34 (Germany).
 * SS Giralda (1887) ( undefined): World War I: The cargo ship was torpedoed and damaged in the North Sea 5 nmi north north west of Whitby, Yorkshire by SMU UC-70 with the loss of six of her crew. She was beached but was consequently declared a total loss.
 *  Johanne (🇩🇰 Denmark): World War I: The schooner was scuttled in the Mediterranean Sea off Carthagena, Spain (37.21667°N, -0.91667°W) by SMU U-34 (Germany) . Her crew survived.
 * MV Mount Carmel} ( undefined): The cargo ship struck a submerged wreck and sank. Her crew were rescued.
 *  Pauline (Flag of Russian SFSR.svg Russia): World War I: The schooner was shelled and sunk in the Atlantic Ocean (47.83333°N, -9.91667°W) by SMU U-53.
 * SMU UC-70 : World War I: The Type UC II submarine was depth charged and sunk in the North Sea (54.53333°N, -0.66667°W) by HMS Ouse (1905) with the loss of all 31 crew.

29 August

 * SS Atxeri Mendi (1899) (🇪🇸 Spain): World War I: The cargo ship was sunk in the Atlantic Ocean 4 nmi south east of the Tuskar Rock, Ireland by SMU UB-125.
 * HMT Guide Me II : The naval trawler collided with another vessel and sank in the Irish Sea off Dún Laoghaire, County Dublin.
 * HMT Puruni : The naval trawler sank in the Caribbean Sea off Mayreau, St. Vincent and the Grenadines.
 * SMU UB-109 : World War I: The Type UB III submarine struck a mine and sank in the Strait of Dover (51.05°N, 1.73333°W) with the loss of 28 of her 36 crew.

30 August

 *  Elsie Porter ( undefined): World War I: The schooner was scuttled in the Atlantic Ocean 290 nmi east of St. John's, Newfoundland by SMU U-113 . Her crew survived.
 * HMS Endymion (1891) : World War I: The Edgar-class cruiser was damaged at Stavros, Greece by SMU UC-37 . Her crew survived.
 * SS Onega (1880) (🇺🇸 United States): World War I: The cargo ship was torpedoed and sunk in the Atlantic Ocean off the Godrevy Lighthouse, Cornwall, United Kingdom (50.28333°N, -5.36667°W) by SMU UB-125 with the loss of 26 of her crew.
 * Potentate ( undefined): World War I: The sailing vessel was scuttled in the Atlantic Ocean 290 nmi east of St. John's, Newfoundland by SMU U-113.

31 August

 *  Gamo (🇵🇹 Portugal): World War I: The schooner was scuttled in the Atlantic Ocean 370 nmi off Flores Islands, Azores by SMU U-155.
 * SS Milwaukee (1897) ( undefined): World War I: The cargo ship was torpeoded and sunk in the Atlantic Ocean 260 nmi south west of the Fastnet Rock (47.36667°N, -12.23333°W) by SMU U-105 with the loss of a crew member.
 * Norte (🇵🇹 Portugal): World War I: The trawler was scuttled in the Atlantic Ocean 30 nmi off Safi, Morocco by SMU U-22 (Germany).

Unknown date

 * GERMAN TRAWLER Triumph : World War I:. The naval trawler was scuttled in the Atlantic Ocean on or after 26 August.