List of shipwrecks in September 1943

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

1 September

 * JAPANESE SUBMARINE I-182 : World War II: The (or possibly I-20) was depth charged and sunk in the Coral Sea off Espiritu Santo (-15.63333°N, 166.95°W) by USS Wadsworth (DD-516) . All 101 crewmen killed.

2 September

 * JAPANESE CARGO Hankow Maru : World War II: Convoy Wewak No. 7: The cargo ship was bombed and sunk at Wewak, New Guinea by B-25 Mitchells and P-38s. 23 troops and 2 crewmen killed.
 * JAPANESE FRIGATE Mutsure : World War II: The was torpedoed and sunk in the Pacific Ocean off Guam (8.66667°N, 151.51667°W)  by USS Snapper (SS-185) . 46 crewmen killed.
 * JAPANESE CARGO Nagato Maru : World War II: Convoy Wewak No. 7: The Nagato Maru Class Transport was bombed and sunk at Wewak, New Guinea by B-25 Mitchells and P-38s. 3 troops and 2 crewmen killed.
 * SS Yowa Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the East China Sea north of Formosa by USS Trigger (SS-237).

3 September

 * SS Akama Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off the coast of Japan by USS Pompano (SS-181).
 * JAPANESE SUBMARINE I-20 : World War II: The Type C submarine (or possibly I-182) was depth charged and sunk in the Coral Sea off Espiritu Santo (-13.16667°N, 165.46667°W) by USS Ellet (DD-398) . All 101 crewmen killed.
 * GERMAN SHIP Sperrbrecher 155 : World War II: The auxiliary ship was scuttled at Antwerp, Belgium. She was raised on 30 May 1945 and completed as the cargo ship Ardea.
 * SS Tagonoura Maru (🇯🇵 Japan): World War II: Convoy 4827: The cargo ship was torpedoed and sunk in the Pacific Ocean off Kyushu by USS Pollack (SS-180) . 6 passengers and 1 crewman killed. Survivors rescued by JAPANESE ESCORT Oki.
 * GERMAN PATROL BOAT UJ-1202 : World War II: The patrol boat was torpedoed and sunk by a submarine off Finnmark, Norway.

4 September

 * SS Heijo Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Papua New Guinea by USS Albacore (SS-218).
 * SS Kozon Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the South China Sea off Formosa by USS Sunfish (SS-281).
 * USS LCI(L)-339 : World War II: The Landing Craft, Infantry - Large was sunk by Japanese aircraft off Lae, New Guinea.
 * JAPANESE SALVAGE SHIP Yusho Maru : World War II: The Yusho Maru class salvage ship struck a mine in Surabaya's North Channel and taken under tow. She struck a second mine and sunk in the Makassar Strait (-5°N, 119°W) on the 5th.

5 September

 * HMS ML 108 (ML108) : World War II: The Fairmile A motor launch was sunk by a mine in the English Channel.
 * SS Tenkai Maru (🇯🇵 Japan): World War II: Convoy Wewak No. 8: The cargo ship was torpedoed and sunk in the Pacific Ocean (1.16667°N, 142.16667°W) by USS Swordfish (SS-193) . 3 troops and 3 crewmen killed.
 * USS YP-279 : World War II: The Naval Trawler sank in heavy weather off Townsville, Australia.

6 September

 * SS Christian Michelsen (1943) (🇳🇴 Norway): World War II: Convoy UGS 17: The cargo ship was torpedoed and sunk in the Mediterranean Sea (37.2°N, 8.43333°W) by GS U-410 with the loss of 55 of the 58 people on board.
 * SS Kofuku Maru : World War II: The Transport was sunk in a collision with SS Maoka Maru(🇯🇵 Japan) in the Sea of Japan 20 miles south of Sado Island (37.7°N, 138.28333°W). Crew rescued by SS Maoka Maru (🇯🇵 Japan).
 * HMS Puckeridge (L108) : World War II: The was torpedoed and sunk in the Mediterranean Sea 40 nmi east of Europa Point, Gibraltar by GS U-617  with the loss of 62 of her 191 crew.
 * SS Tbilisi (1912) ( Soviet Union): World War II: The cargo ship struck a mine and sank in the Kara Sea (72.36778°N, 80.55028°W) with the loss of two crew.

7 September

 * Hamidieh (🇪🇬 Egypt): World War II: The sailing ship was shelled and sunk in the Mediterranean Sea 34 nmi south of Cape Gata, Cyprus (34.03333°N, 33.08333°W) by GS U-596 . All crew survived.
 * USS PT-118 : World War II: The ELCO 80'-class PT Boat ran aground off Vela Lavella and was scuttled.
 * USS PT-172 : World War II: The ELCO 80'-class PT Boat ran aground off Vela Lavella and was scuttled.
 * ITALIAN SUBMARINE Velella : World War II: The Argo-class submarine was torpedoed and sunk off Salerno, Italy (40.11667°N, 14.83333°W) by HMS Shakespeare (P221).

8 September

 * ITALIAN SUBMARINE H 6 : World War II: The Holland 602 type submarine submarine was bombed and sunk at Maddalena by Allied aircraft. Raised and scrapped.
 * HMS LCT 624 (LCT624) : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea..
 * HMS MTB 77 (MTB77) : World War II: The Vosper 72'-class Motor Torpedo Boat was bombed and sunk off Vigo, Spain by German aircraft.
 * MS Rauenthaler (🇩🇪 Germany): The cargo ship was lost in a collision off Trondheim, Norway.
 * GS U-983 : The Type VIIC submarine collided in the Baltic Sea north of Loba (54.76667°N, 17.23333°W) with GS U-988 and sank with the loss of five of her 43 crew.

9 September

 * ITALIAN SUBMARINE Ambra : World War II: The Perla-class submarine was scuttled at La Spezia.
 * ITALIAN SUBMARINE Ammiraglio des Geneys : World War II: The Pisani-class submarine was scuttled at Pola.
 * ITALIAN SUBMARINE Aradam : World War II: The Adua-class submarine was bombed and sunk at Genoa by Allied aircraft.
 * SS Conte Verde ( undefined): World War II: The Ocean Liner (A.K.A. Teikyo Maru) was scuttled by her Italian crew at Shanghai in the Whangpoo River. Raised by the Japanese.
 * ITALIAN SUBMARINE Giovanni Bausan : World War II: The Pisani-class submarine was scuttled at Pola.
 * USS Grayling (SS-209) : World War II: The T-class submarine was rammed and sunk by SS Hokuan Maru (🇯🇵 Japan) west of Luzon.
 * JAPANESE SUBMARINE I-182 : World War II: The Kaidai-class submarine was torpedoed and sunk in the Surigao Strait by USS Trout (SS-202).
 * SS Koyo Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Honshu by USS Harder (SS-257).
 * USS LCT-366 (LCT366) : World War II: The LCI-1-class Landing Craft, Tank sank in heavy weather in the Gulf of Alaska (53.01667°N, 152°W).
 * HMS LCT 572 (LCT572) : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea.
 * HMS LCT 626 (LCT626) : World War II: The LCT-1-class Landing Craft, Tank was lost in the Mediterranean Sea.
 * MV Larchbank (🇬🇧 United Kingdom): World War II: The Inverbank class cargo ship was torpedoed and sunk in the Indian Ocean 200 miles west of Cape Cormorin (7.63333°N, 74°W) by JAPANESE SUBMARINE I-27 . 6 Gunners and 40 crewmen killed, 30 survivors rescued by SS Tahania (🇬🇧 United Kingdom) and SS Panaman (🇺🇸 United States).
 *  : World War II: The Vosper 72'-class Motor Torpedo Boat was lost as cargo when MV Larchbank (🇬🇧 United Kingdom) was sunk by JAPANESE SUBMARINE I-27  in the Indian Ocean (7.63333°N, 74°W).
 *  : World War II: The Vosper 72'-class Motor Torpedo Boat was lost as cargo when MV Larchbank (🇬🇧 United Kingdom) was sunk by JAPANESE SUBMARINE I-27 in the Indian Ocean (7.63333°N, 74°W).
 * ITALIAN SUBMARINE Murena : World War II: The Flutto-class submarine was scuttled at La Spezia, Italy. Raised, repaired and put in Kriegsmarine service as UIT-16.
 * USS Nauset (AT-89) : World War II: The was bombed and sunk in the Gulf of Salerno by Luftwaffe aircraft with the loss of eighteen of her 113 crew.
 * ITALIAN BATTLESHIP Roma : World War II: The was sunk in the Mediterranean Sea off Asinara by a Fritz X launched by a Dornier Do 217 of the Luftwaffe with the loss of 1,253 of her 1,849 crew.
 * SS Silvano (1906) ( undefined): World War II: The cargo ship was scuttled at Naples, Italy. Wreck raised in 1944 and scrapped.
 * ITALIAN SUBMARINE Sirena : World War II: The Sirena-class submarine was scuttled at Maddalena.
 * ITALIAN CRUISER Taranto : World War II: The was scuttled at La Spezia, Italy. Later raised by the Germans, and sunk twice more. Scrapped in 1946-47.
 * MV Toni II ( undefined): World War II: The severely damaged tanker was scuttled at Naples. She was raised in 1946, repaired and returned to service.
 * ITALIAN SUBMARINE Volframio : World War II: The Acciaio-class submarine was scuttled at Maddalena. Raised by the Germans.

10 September

 * HMS Abdiel (M39) : World War II: The struck a mine and sank at Taranto, Apulia, Italy (40.48333°N, 17.25°W) and sank with the loss of 151 of the 276 people on board.
 * ITALIAN SUBMARINE Argo : World War II: The Medusa-class submarine was scuttled at Montefalcone.
 * SS Ryotoku Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Surigao Strait by USS Trout (SS-202).
 * JAPANESE MINESWEEPER W-16 : World War II: The  was bombed and sunk in Makassar Strait south of Makassar (-6.13333°N, 119.33333°W) by 5th Air Force B-24s.
 * SS Yamashiro Maru (🇯🇵 Japan): World War II: The cargo liner was torpedoed and sunk in the Surigao Strait by USS Trout (SS-202).

11 September

 * SS Anke (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk by HNOMS MTB 618 and HNOMS MTB 627 (both ) off Trondheim, Norway.
 * SS Conte di Savoia ( undefined: World War II: The ocean liner was scuttled at Malamocco, Veneto. She was refloated 16 October 1945 but deemed uneconomic to repair and scrapped in 1950 at Monfalcone, Friuli-Venezia Giulia.
 * USS LCT-71 (LCT71) : World War II: The LCT-1-class Landing Craft, Tank sank in heavy weather in the Gulf of Alaska (53.63333°N, 146.08333°W).
 * USS Rowan (DD-405) : World War II: The was torpedoed and sunk in the Mediterranean Sea off Salerno, Italy by a Kriegsmarine E-boat with the loss of 202 of her 273 crew.
 * GERMAN SUBMARINE CHASER UJ-1217 : World War II: The submarine chaser was torpedoed and sunk in the Syltefjorden (70.63333°N, 30.43333°W) by SOVIET SUBMARINE M-7.
 * X5, X6, X7, X8 and X9 (all ): World War II: Operation Source: The midget submarines were all expended in attacks on GERMAN CRUISER Lützow, GERMAN BATTLESHIP Scharnhorst and GERMAN BATTLESHIP Tirpitz (all ) in Kåfjord and Langefjord, Norway. Of the fifteen crew, nine were killed and six taken as prisoners of war.
 * SS Yoko Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Honshu by USS Harder (SS-257).

12 September

 * ITALIAN SUBMARINE Ametiste : World War II: The Medusa-class submarine was scuttled off Ancona.
 * USS Navajo (AT-64) : World War II: The was torpedoed and sunk in the Pacific Ocean (-14.97639°N, 169.29917°W by JAPANESE SUBMARINE I-39  with the loss of seventeen of her 80 crew.
 * ITALIAN SUBMARINE Serpente : World War II: The Argonauta-class submarine was scuttled off Ancona.
 * GS U-617 : World War II: The Type VIIC submarine ran aground off Melilla, Spain (35.63333°N, -3.45°W) whilst under attack by Lockheed Hudson aircraft of 48 and 233 Squadrons, Royal Air Force and Fairey Swordfish aircraft of 833 and 886 Squadrons, Fleet Air Arm. All 49 crew survived the attack. U-617 was shelled and sunk by HMS Hyacinth (K84) and HMAS Wollongong (J172).

13 September

 * SS Fort Babine (🇬🇧 United Kingdom): World War II: The Fort ship was bombed and sunk in the Atlantic Ocean (41.51667°N, -14.65°W by Luftwaffe aircraft.
 *  Terra Nova (🇬🇧 United Kingdom): The barque was damaged by ice and sank in the Atlantic Ocean off the south west tip of Greenland. Her crew were rescued by USCGC Southwind (WAGB-280).
 * SS Yamato Maru (1913) (🇯🇵 Japan): World War II: The transport ship was torpedoed and sunk in the East China Sea by USS Snook (SS-279).

14 September

 * MV Bramora (1927) (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk in the Indian Ocean (6.16667°N, 67.61667°W) by JAPANESE SUBMARINE I-10 with the loss of all 40 crew, who may have been massacred.
 * GREEK SUBMARINE Katsonis : World War II: The was sunk in the Aegean Sea off Skiathos by GERMAN SUBMARINE CHASE UJ-2010.

15 September

 * SS Bushrod Washington (🇺🇸 United States): World War II: The Liberty ship was bombed and sunk at Salerno, Italy by Luftwaffe aircraft.
 * USS LCT-241 (LCT241) : World War II: The LCI-1-class Landing Craft, Tank was bombed and sunk off Salerno, Italy.
 * JAPANESE SUBMARINE Ro-101 : World War II: The was depth charged, shelled and sunk in the Coral Sea east of San Cristobal Island (-10.95°N, 163.93333°W) by USS Saufley (DD-465)  and a US Navy Consolidated PBY Catalina of Squadron VP-23. Lost with all 50 hands.

16 September

 * SS Graziella (1917) (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk in the North Sea off the Kvassheim Lighthouse by aircraft of 489 Squadron, Royal New Zealand Air Force. All crew survived.
 * Heisternest : The gunboat was bombed and sunk by US aircraft at Nantes, France.

17 September

 * USS PT-136 : World War II: The ELCO 80 foot-class PT Boat ran aground off Malai Island in the Vitiaz Strait (-5.91667°N, 148.01667°W) and was scuttled.

18 September

 * SS Kansai Maru : World War II: Convoy O-602A: The Transport was torpedoed in the Bismarck Sea (0.68333°N, 146.46667°W) by USS Scamp (SS-277), sinking early on 19th. 23 troops and 1 crewman killed. Survivors rescued by JAPANESE SUBMARINE CHASER CH-16 and JAPANESE SUBMARINE CHASER CH-28 (both ).
 * GERMAN SUBMARINE CHASER UJ-2104 : The submarine chaser was shelled and damaged in the Bay of Stampalia by HMS Eclipse (H08), HMS Faulknor (H62) (both ) and GREEK DESTROYER Vasilissa Olga . She was scuttled by her crew at (36.56667°N, 26.5°W).

19 September

 * HMS BYMS 2019 (BMYS2019) : World War II: The YMS-1-class minesweeper was mined and beached off Crotone, Italy.
 * SS Fort Longueuil (🇬🇧 United Kingdom): World War II: The Fort ship was torpedoed and sunk in the Indian Ocean south west of the Chagos Archipelago (approximately -10°N, 68°W) by GS U-532 with the loss of 57 of her 59 crew.
 * SS Kachisan Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Honshu by USS Harder (SS-257).
 * MS Strassburg (🇩🇪 Germany): World War II: The hospital ship was torpedoed and damaged in the Mediterranean Sea by MTB 617 . She sank the next day at 52.4875°N, 4.53444°W.
 * GS U-341 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (58.56667°N, -25.5°W) by a Consolidated B-24 Liberator aircraft of 10 Squadron, Royal Canadian Air Force with the loss of all 50 crew.

20 September

 * SS Frederick Douglass (🇺🇸 United States): World War II: Convoy ON 202: The Liberty ship was torpedoed and damaged sunk in the Atlantic Ocean (57.05°N, -28.13333°W) by GS U-238 and was abandoned by her 70 crew. They were rescued by SS Rathlin (🇬🇧 United Kingdom). Frederick Douglass was later torpedoed and sunk by GS U-645.
 * HMS Lagan (K259) : World War II: Convoy ON 202: The was torpedoed and damaged in the Atlantic Ocean 57.15°N, -27.46667°W by GS U-270  with the loss of 28 crew. She was towed to the United Kingdom by ST Destiny (🇬🇧 United Kingdom) but was declared a constructive total loss.
 * HMCS St. Croix (I81) : World War II: Convoy ON 202: The was torpedoed and sunk in the Bay of Biscay (57.5°N, -31.5°W) by GS U-305  with the loss of 148 of her 229 crew. The 81 survivors were rescued by HMS Itchen (K227), but 80 of them would be killed the next day when that ship was sunk by GS U-666.
 * SS St Usk (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean (-16.5°N, -29.46667°W) by GS U-161 (1941) . Her captain was taken as a prisoner of war, the rest of her 51 crew were rescued by SS Albareda (🇪🇸 Spain).
 * SS Theodore Dwight Weld (🇺🇸 United States): World War II: Convoy ON 202: The Liberty ship was torpedoed and sunk in the Atlantic Ocean 500 nmi south west of Iceland (57.05°N, -28.13333°W) by GS U-238 with the loss of 33 of her 70 crew. Survivors were rescued by SS Rathlin (🇬🇧 United Kingdom).
 * GS U-338 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean by HMCS Drumheller (K167) with the loss of all 51 crew.
 * GS U-346 :The Type VIIC submarine sank in Danzig Bay (54.62722°N, 18.84056°W in a diving accident with the loss of 37 of her 43 crew.

21 September

 * JAPANESE FREIGHTER Argun Maru : : World War II: Convoy RINJI-B: The cargo ship was torpedoed and sunk in the East China Sea north east of Formosa(26.55°N, 123.16667°W) by USS Trigger (SS-237) . 2 crewmen killed.
 * GERMAN MINELAYER Brandenburg : World War II: The minelayer was torpedoed and sunk by a submarine east of Capraia, Italy (43.10833°N, 10.02°W).
 * SS Cornelia P. Spencer (🇺🇸 United States): World War II: The Liberty ship was torpedoed and sunk in the Indian Ocean (2.13333°N, 50.16667°W) by GS U-188 with the loss of two of her 68 crew. Survivors were rescued by HMS Relentless (H85), SS Sandown Castle (🇬🇧 United Kingdom) or reached land in their lifeboat.
 * SS Nikolaus (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk by a submarine off Bastia, Corsica.
 * HMS Polyanthus (K47) : World War II: Convoys ONS 18/ON 202: The was torpedoed and sunk in the Bay of Biscay (57°N, -31.16667°W) by GS U-952 ( with the loss of all but one of her 85 crew, and 80 crew from HMCS St. Croix.
 * JAPANESE OILER Shiriya : : World War II: Convoy RINJI-B: The Fleet Oiler was torpedoed and sunk in the East China Sea north east of Formosa (26.55°N, 123.16667°W) by USS Trigger (SS-237).
 * JAPANESE OILER Shoyo Maru : : World War II: Convoy RINJI-B: The Oiler was torpedoed and sunk in the East China Sea north east of Formosa (26.45°N, 122.66667°W)  by USS Trigger (SS-237) . 5 crewmen killed.
 * SS Tiberiade (🇫🇷 France): World War II: The cargo ship capsized and sank in an Allied air raid on Bastia, Corsica.
 * SS William W. Gerhard (🇺🇸 United States): World War II: Convoy NSS 3: The Liberty ship was torpedoed and damaged in the Tyrrhenian Sea 45 nmi south of Salerno, Italy (40.08333°N, 14.71667°W) by GS U-593 with the loss of two of the 267 people on board. Survivors abandoned ship and were rescued by the convoy's escorts, including USS Symbol (AM-123), which rescued 124 people. The crew reboarded William W. Gerhard. She was taken in tow by USS Moreno (ATF-87)  but a fire broke out and the crew were taken off. Her cargo of ammunition exploded and the ship broke in two, with the bow section sinking. The stern section was scuttled by USS Moreno.

22 September

 * USS APc-35 (APc-35) : World War II: The Coastal Transport ran agound off Tetepare Island, Solomon Islands (-8.8°N, 157.76667°W) and was abandoned.
 * HMS Itchen (K227) : World War II: Convoys ONS 18/ON 202: The was torpedoed and sunk in the Atlantic Ocean by GS U-666 ( with The loss of all but one of her crew.
 * SS Katsurahama Maru (🇯🇵 Japan): World War II: The coaster was torpedoed and sunk in the East China Sea by USS Snook (SS-279).
 * HMT Ocean Retreiver : World War II: The naval trawler struck a mine and sank in the Thames Estuary with the loss of all eleven crew.
 * SS Richard Olney (🇺🇸 United States): World War II: The Liberty ship struck a mine and was damaged in the Mediterranean Sea (37.41667°N, 9.9°W). She was towed to Bizerta, Algeria but was declared a constructive total loss.
 * MS Rovigno ( undefined): World War II: The passenger ship was torpedoed and sunk by a submarine off Vlorë, Albania.
 * GS U-229 : World War II: The Type VIIC submarine was depth charged, shelled, rammed and sunk in the Atlantic Ocean south east of Cape Farewell, Greenland (54.6°N, -36.41667°W) by HMS Keppel (D84) with the loss of all 50 crew.

23 September

 * SS Daishin Maru (🇯🇵 Japan): World War II: The tanker was torpedoed and sunk in the Pacific Ocean south of Honshu (34.25°N, 137°W) by USS Harder (SS-257).
 * SS Fort Jemseg (🇬🇧 United Kingdom): World War II: Convoy ON 202: The Fort ship was torpedoed and sunk in the Atlantic Ocean (53.3°N, -40.4°W) by GS U-238 with the loss of one of her 53 crew. Survivors were rescued by SS Romulus (🇳🇴 Norway) and HMT Northern Foam.
 * SS Kansai Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Bismarck Sea by USS Scamp (SS-277).
 * SS Kertosono (🇳🇱 Netherlands): World War II: The passenger/cargo ship was bombed and sunk by aircraft at Nantes, France.
 * SS Kowa Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean off Honshu by USS Harder (SS-257).
 * MV Oregon Express (1933) (🇳🇴 Norway): World War II: Convoy ON 202: The cargo ship was torpedoed and sunk in the Atlantic Ocean (53.66667°N, -39.83333°W) by GS U-238 with the loss of eight of her 45 crew. Survivors were rescued by SS Kingman (🇵🇦 Panama) and (SS Romulus (🇳🇴 Norway).
 * Schnelles Geleitboot 2 : World War II: The sloop was bombed and sunk at Nantes, Loire-Atlantique by Royal Air Force aircraft.
 * MV Skjelbred (1937) (🇳🇴 Norway): World War II: Convoy ON 202: The tanker was torpedoed and sunk in the Atlantic Ocean (53.3°N, -40.4°W by GS U-238 . All 43 crew were rescued by HMT Northern Foam.
 * SS Steel Voyager (🇺🇸 United States}): World War II: Convoys ONS 18/ON 202: The cargo ship was torpedoed and sunk in the Atlantic Ocean (53.3°N, -40.4°W) by GS U-952 . All 66 crew were rescued by HMCS Morden (K170) and FRENCH CORVETTE Renoncule.

24 September

 * SS Elias Howe (🇺🇸 United States): World War II: The Liberty ship was torpedoed and sunk in the Arabian Sea (11.58333°N, 45.83333°W) by JAPANESE SUBMARINE I-10.
 * HMS MMS 70 (J570) : World War II: The MMS-class minesweeper was sunk by a mine in the Gulf of Taranto.
 * MV Mostun (1938) (🇳🇴 Norway): World War II: The cargo ship struck a mine and sank in Gulenfjord. She was raised the next day, repaired and returned to service.

25 September

 * HMT Donna Nook (FY1559) : World War II: The naval trawler was rammed and sunk in the North Sea off Harwich, Essex by HMT Stella Rigel while engaging Kriegsmarine E-boats. All crew were rescued.
 * ITALIAN TORPEDO BOAT Enrico Cosenz : World War II: The Giuseppe La Masa-class torpedo boat Torpedo Boat was bombed and damaged by German aircraft. Scuttled on the 27th off Lagosta Island.
 * HMT Franc Tireur (FY1560) : World War II: The naval trawler was torpedoed and sunk in the North Sea off Harwich by GERMAN TORPEDO BOAT S-96 with the loss of all fifteen crew.
 * ITALIAN TORPEDO BOAT Giuseppe Sirtori World War II: The Giuseppe Sirtori-class torpedo boat was scuttled by its crew after taking damage by German aircraft.
 * JAPANESE OILER Kirishima Maru : World War II: Convoy SA-12: The oiler was torpedoed and sunk in the South China Sea (9.88333°N, 112.16667°W) by USS Bowfin (SS-287) . 14 crewmen killed.
 * GERMAN TORPEDO BOAT S-96 : World War II: The E-boat was rammed and damaged in the North Sea off the Sunk Lightship (🇬🇧 United Kingdom) by HMML 145 and HMML 150 (both ) and was abandoned. Thirteen crew were rescued by HMML 145 and taken as prisoners of war.
 * MS Probitas (1919) ( undefined): World War II: The cargo ship was bombed and sunk by aircraft off Santi Quaranta, Albania.
 * SS San Pablo (🇵🇦 Panama): The cargo ship was sunk as a target in the Gulf of Mexico 9 nmi south east of the Pensacola Pass.
 * USS Skill (AM-115) : World War II: The was torpedoed and sunk in the Gulf of Salerno (40.33333°N, 14.58333°W) by GS U-593  with the loss of 72 of her 103 crew. Survivors were rescued by USS Speed (AM-116).
 * SS Taiko Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by USS Pompano (SS-181).

26 September

 * SS Christian Michelsen (🇺🇸 United States): World War II: The Liberty ship was torpedoed and sunk in the Mediterranean Sea 80 nmi west of Bizerta, Algeria by GS U-140 (1940).
 * HMS Intrepid (D10) : World War II: The was bombed and sunk at Leros, Greece by Junkers Ju 88 aircraft of the Luftwaffe with the loss of fifteen crew. Survivors were rescued by HMML 354, HMML 356 and HMML 836 (all ).
 * MV Itapagé (🇧🇷 Brazil): World War II: The cargo liner was torpedoed and sunk in the Atlantic Ocean (-10.08333°N, -35.9°W) by GS U-161 (1941) with the loss of 22 of the 107 people on board.
 * JAPANESE TORPEDOBOAT Kasasagi : World War II: The Class Torpedo Boat was torpedoed and sunk in the Flores Sea (-5°N, 121.95°W) by USS Bluefish (SS-222).
 * SS Madali (1911) (🇩🇪 Germany): World War II: The cargo ship was shelled and sunk in the English Channel, west of Authie Bay, France (50.36667°N, 1.06667°W).
 * GREEK DESTROYER Vasilissa Olga : World War II: The G-class destroyer was bombed and sunk at Leros by Junkers Ju 88 aircraft of the Luftwaffe with the loss of 72 of her 145 crew. Survivors were rescued by HMML 354, HMML 356 and HMML 836 (all ).

27 September

 * SS Arare Maru : World War II: Operation Jaywick : The tanker was mined and sunk by Australian Commandos using Limpet mines at Singapore. 1 crewman killed. Raised, repaired, returned to service.
 * Hakusan Maru : World War II: Operation Jaywick : The tanker was mined and sunk by Australian Commandos using Limpet mines at Singapore.
 * SS Kizan Maru : World War II: Operation Jaywick : The cargo ship was mined and sunk by Australian Commandos using Limpet mines at Singapore. 1 crewman killed. Wreck broken up July 1944.
 * SS Taisei Maru (🇯🇵 Japan): World War II: Convoy Wewak No.9 : The transport was bombed and sunk by US aircraft north of Wewak, New Guinea. 6 Gunners and 7 crewmen killed.
 * GS U-161 (1941) : World War II: The Type IXC submarine was depth charged and sunk in the Atlantic Ocean (-12.5°N, -35.58333°W) by Martin PBM Mariner aircraft of the United States Navy with the loss of all 53 crew and one survivor from SS St Usk (🇬🇧 United Kingdom who had been taken on board as a prisoner of war.
 * GS U-221 : World War II: The Type VIIC submarine was depth charged and sunk in the Atlantic Ocean (approximately 47°N, -18°W) by a Handley Page Halifax aircraft of 58 Squadron, Royal Air Force with the loss of all 50 crew.

28 September

 * USS Cisco (SS-290) (: World War II: The was bombed, depth charged and sunk in the Sulu Sea west of Negros, Philippines(9.78333°N, 121.73333°W) by Japanese aircraft.
 * JAPANESE MINELAYER Hoko : World War II: The  was bombed and sunk 20 miles east of Buka, Bouganville (-5°N, 154.5°W) by US aircraft.

29 September

 * SS Banffshire (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Arabian Sea north west of the Maldive Islands (9.43333°N, 71.33333°W) by GS U-532 with the loss of one of her 100 crew. Survivors were rescued by HMS Rajputana (J197).
 * USS LCT-342 : World War II: The LCI-1-class Landing Craft, Tank was lost by grounding off Salerno, Italy.

30 September

 * SS Arkhangel'sk ( Soviet Union): World War II: Convoy VA 18: The cargo ship was torpedoed and sunk in the Kara Sea west of Russkij Island (76.9°N, 92.48333°W) by GS U-960 with the loss of seventeen of her 42 crew. Survivors were rescued by SOVIET MINESWEEPER T-886.
 * SS Fort a la Corne 🇬🇧 United Kingdom): World War II: Convoy ET 16: The cargo ship was torpedoed and sunk in the Mediterranean Sea (36.86667°N, 1.78333°W) by GS U-596.
 * SS Fort Howe (🇬🇧 United Kingdom): World War II: The Fort ship was torpedoed and sunk in the Mediterranean Sea (37.31667°N, 6.66667°W) by GS U-410.
 * MV Hallanger (1928) 🇳🇴 Norway): World War II: Convoy ET 16: The tanker was torpedoed and sunk in the Mediterranean Sea (36.91667°N, 1.65°W) by GS U-596 . All 40 crew survived.
 * HMS LCT 2231 (LCT2231) : World War II: The LCT-1-class Landing Craft, Tank was lost as cargo aboard HMS LST 79 (LST79)  when she was torpedoed and sunk at Ajaccio, Corsica.
 * HMS LST 79 (LST79) : World War II: The LST-1-class Landing Ship, Tank was torpedoed and sunk by German aircraft at Ajaccio, Corsica.
 * JAPANESE TRANSPORT Maebashi Maru : World War II: Convoy N-805: The Transport was torpedoed and sunk in the Pacific Ocean 373 miles east south east of Palau(1°N, 139.46667°W) by USS Pogy (SS-266) . 1,389 troops, 13 Gunners, and 48 crewmen killed.
 * USS PT-68 : World War II: The ELCO 77'-class PT Boat ran aground off Vincke Point, Huon Peninsula, New Guinea (-5.93333°N, 147.3°W) and was scuttled.
 * SS Sanct Svithun (🇳🇴 Norway): World War II: The passenger ship was bombed and sunk off the Stad Peninsula, Sogn og Fjordane, Norway, by aircraft of 404 Squadron Royal Canadian Air Force

Unknown date

 * USS Grayling (SS-209) : The  was sunk by enemy action in the South China Sea between 9 and 12 September with the loss of all 60 crew.
 * HMS LCI(L)-107 (LCI(L)-107) : World War II: The Landing Craft Infantry - Large was lost in September.
 * USS Pompano (SS-181) : World War II: The struck a mine and sank in the Pacific Ocean on or after 25 September.
 * SOVIET SUBMARINE K-1 : World War II: The K-class submarine was lost in the Kara Sea after leaving base on September 5.
 * GS U-669 : World War II: The Type VIIC submarine disappeared on patrol in the Bay of Biscay with the loss of all 52 crew. Cause unknown.
 * Calitea II : World War II: The cargo ship, the disarmed former armed merchant cruiser Ramb II, was scuttled by her crew at Kobe, Japan in early September after the Italian government surrendered to the Allies. Raised, repaired and put into Japanese service as Ikutagawa Maru.