List of shipwrecks in May 1945

The list of shipwrecks in May 1945 includes ships sunk, foundered, grounded, or otherwise lost during May 1945.

1 May

 * JAPANESE ESCORT CD-50 : World War II: The Type D escort ship was torpedoed and damaged in the Pacific Ocean off Sasumi (34.25°N, 135.08333°W) by USS Sennet (SS-408) and beached. 9 crewmen killed. Refloated sometime in May and towed to Osaka. Repairs not finished at end of the War, scrapped May, 1948.
 * JAPANESE AUXILIARY TRANSPORT Chowa Maru : World War II: The Chowa Maru class transport was torpedoed and sunk in the Pacific Ocean 54 miles south east of Hakkaido off Cape Erimo (41.03333°N, 144.6°W) by USS Bowfin (SS-287) . 41 crewmen killed.
 * GERMAN TORPEDO BOAT TA43 : World War II: The Torpedo Boat was scuttled at Trieste.
 * GS U-3006 : End of World War II: The Type XXI submarine was scuttled at Wilhelmshaven, Lower Saxony. The wreck was scrapped post-war.
 * GS U-3009 : End of World War II: The Type XXI submarine was scuttled at Wesermünde, Bremen. The wreck was scrapped post-war.

2 May

 * Admiral Hipper : End of World War II: The Admiral Hipper-class cruiser was scuttled at Kiel, Schleswig-Holstein.
 * HMT Ebor Wyke (FY1601) : World War II: The naval trawler was torpedoed and sunk in the Atlantic Ocean 7 nmi off Skagi, Iceland (64.16667°N, -23.2°W) by GS U-979 with the loss of 23 of her 24 crew.
 * Kieblitz : World War II: The Fasana class Minelayer was scuttled in the Tagliemento Estuary.
 * GERMAN MINESWEEPER M-293 : World War II: The minesweeper was bombed and sunk by aircraft in the Kattegat.
 * JAPANESE ESCORT Ojika : World War II: The (A.K.A. Oga) was torpedoed and sunk in the Yellow Sea by USS Springer (SS-414) . Lost with all 226 hands
 * SS Rezikan Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by USS Raton (SS-270).
 * SS Toryu Maru (🇯🇵 Japan): World War II: The tanker was torpedoed and sunk in the Yellow Sea by USS Raton (SS-270).
 * GERMAN MINESWEEPER TS-2 : World War II: The minesweeper was scuttled at Lübeck, Germany.
 * U-8 : End of World War II: The Type IIB submarine was scuttled at Wilhelmshaven, Lower Saxony.
 * U-14 : End of World War II: The Type IIB submarine was scuttled at Wilhelmshaven.
 * U-60 : End of World War II: The Type IIC submarine was scuttled at Wilhelmshaven.
 * U-61 : End of World War II: The Type IIC submarine was scuttled at Wilhelmshaven.
 * U-62 : End of World War II: The Type IIC submarine was scuttled at Wilhelmshaven.
 * GS U-71 (1940) : End of World War II: The Type VIIC submarine was scuttled at Wilhelmshaven.
 * GS U-72 (1940) : End of World War II: The Type VIIC submarine was scuttled at Wilhelmshaven.
 * U-120 : End of World War II: The Type IIB submarine was scuttled at Bremerhaven. The wreck was raised in 1950 and scrapped.
 * U-121 : End of World War II: The Type IIB submarine was scuttled at Bremerhaven. The wreck was raised in 1950 and scrapped.
 * U-137 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-139 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-140 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-141 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-142 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-146 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-148 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-151 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * U-152 : End of World War II: The Type IID submarine was scuttled at Wilhelmshaven. The wreck was later scrapped.
 * GS U-316 : End of World War II: The Type VIIC submarine was scuttled in the Baltic Sea off Travemünde, Lübeck (53.96667°N, 10.88333°W).
 * GS U-552 : End of World War II: The Type VIIC submarine was scuttled off Wilhelmshaven (53.85°N, 8.16667°W).
 * GS U-554 : End of World War II: The Type VIIC submarine was scuttled of Wilhelmshaven (53.85°N, 8.16667°W).
 * GS U-612 : End of World War II: The Type VIIC submarine was scuttled off Warnemünde (54.18333°N, 12.08333°W). The wreck was scrapped in 1946.
 * GS U-717 : End of World War II: The Type VIIC submarine was scuttled in the Wasserlebenbucht (54.81667°N, 9.45°W).
 * GS U-929 : End of World War II: The Type VIIC.41 submarine was scuttled at Warnemünde. The wreck was raised in 1956 and scrapped.
 * GS U-1007 : World War II: The Type VIIC/41 submarine was damaged in a rocket attack by Hawker Typhoon aircraft of 245 Squadron, Royal Air Force. She was consequently scuttled in the Trave River off Lübeck (53.9°N, 10.85°W) with the loss of two of her crew. The wreck was raised in May 1946 and scrapped.
 * GS U-1308 : End of World War II: The Type VIIC/41 submarine was scuttled off Warnemünde (54.21667°N, 12.05°W). The wreck was raised in October 1952 and scrapped.
 * GS U-2327 : End of World War II: The Type XXIII submarine was scuttled at Hamburg. The wreck was scrapped post-war.
 * GS U-2359 : World War II: The Type XXIII submarine was sunk in the Kattegat (57.48333°N, 11.4°W) by a rocket attack by de Havilland Mosquito aircraft of 143, 235, 248 and 333 Squadrons, Royal Air Force and 404 Squadron, Royal Canadian Air Force with the loss of all twelve crew.
 * GS U-2510 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2526 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2527 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2528 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2531 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3002 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3016 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3018 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3019 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3020 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3021 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3504 : End of World War II: The Type XXI submarine was scuttled at Wilhelmshaven. The wreck was scrapped post-war.
 * GS U-3516 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3517 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3521 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3522 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.

3 May
For the scuttling of the U-boat U-1201'' on this day, see the entry for 11 March 1945. For the scuttling of the U-boat U-3525 on this day, see the entry for 30 April 1945.''
 * SMS Arcona : World War II: The floating anti-aircraft battery was scuttled at Wilhelmshaven, Germany. Salvaged and scrapped in 1948.
 * JAPANESE ESCORT CD-25 : World War II: The Type C escort ship was torpedoed and sunk in the Yellow Sea (33.93333°N, 122.81667°W) by USS Springer (SS-414) . Lost with all 175 hands.
 * SS Cap Arcona (1927) : World War II: The ocean liner was sunk in the Bay of Lübeck by Royal Air Force aircraft.
 * SS Deutschland (1923) (🇩🇪 Germany): World War II: The cargo liner was bombed and sunk by aircraft off Neustadt.
 * SS Dwarsee (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Fehmarn, Germany.
 * GERMAN CRUISER Emden : World War II: The cruiser was scuttled off Kiel, Germany. The wreck was broken up in 1949.
 * MS Erna Gaulke (1919) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Fehmarn, Germany.
 * GERMAN ESCORT SHIP F3 : World War II: The escort ship was sunk by Hawker Typhoon fighter bombers at Kiel, Germany. Raised and scrapped in 1948.
 * SS Inster (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Kiel, Germany (54.507°N, 10.37633°W).
 * SS Insterburg (1919) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft east of Kiel, Germany.
 * USS Lagarto (SS-371) : World War II: The Gato-class submarine was sunk in the Gulf of Siam (7.91667°N, 102°W) by JAPANESE MINELAYER Hatsutaka.
 * USS Little (DD-803) : World War II: The Fletcher-class destroyer was sunk in the Pacific Ocean west of Okinawa (26.4°N, 126.25°W) by a Japanese kamikaze attack.
 * USS LSM(R)-195 : World War II: The LSM(R)-188-class Landing Ship, Medium was sunk in the Pacific Ocean off Okinawa by a Japanese kamikaze attack.
 * GERMAN MINESWEEPER M-14 : World War II: The minesweeper struck a mine and sank off Swinemünde, Germany.
 * SMS Medusa : World War II: The floating anti-aircraft battery was scuttled at Wilhelmshaven, Germany. Salvaged and scrapped in 1948-1950.
 * GERMAN TRAINING SHIP Nordland : World War II: The training ship was scuttled at Eckernförde.
 * MS Ostwind (1940) (🇩🇪 Germany): World War II: The passenger/cargo ship was bombed by aircraft off Fehmarn, Germany. Sank on 7 May 1945, raised and scrapped at Gdansk in 1949.
 * SS Pallas (1904) (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk by aircraft off Langesund, Norway.
 * GERMAN MOTOR TORPEDO BOAT S-201 : World War II: The Schnellboot was sunk at Kiel.
 * GERMAN BATTLESHIP Schlesien : World War II: The training ship struck a mine and was beached at Zinnowitz, Germany. The wreck was broken up in 1949-56.
 * GERMAN TORPEDO BOAT T-8 : World War II: The torpedo boat was scuttled at Kiel, Germany (54.43333°N, 10.16667°W).
 * GERMAN TORPEDO BOAT T-9 : World War II: The torpedo boat was scuttled at Kiel, Germany (54.43333°N, 10.16667°W).
 * GERMAN TANKER Taifun : World War II: The tanker was bombed and sunk off Kjelnør, Norway by Bristol Beaufighter aircraft of 236 and 254 Squadrons, Royal Air Force. She was salvaged in 1946, repaired and returned to service.
 * SS Thielbek (1940) (🇩🇪 Germany): World War II: The prisoner ship was sunk by rocket-armed aircraft off Neustadt, Germany. 2,750 prisoners lost their lives, with 50 surviving the sinking. Raised and repaired in 1949.
 * GS U-A : End of World War II: The Oruç Reis-class submarine was scuttled at Kiel, Schleswig-Holstein. The wreck was scrapped post-war.
 * GS U-B : End of World War II: The Grampus-class submarine was scuttled in Heikendorf Bay, Kiel (54.36667°N, 10.18333°W. The wreck was salvaged and scrapped post-war.
 * GS U-C2 (1919) : End of World War II: The B-class submarine was scuttled at Kiel. The wreck was raised and scrapped post-war.
 * GS U-D1 : End of World War II: The H-class submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-D2 : End of World War II: The O 12-class submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-D3 : End of World War II: The O 21-class submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-D4 : End of World War II: The O 21-class submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-48 (1939) : End of World War II: The Type VIIB submarine was scuttled in the Bay of Lübeck.
 * GS U-52 (1939) : End of World War II: The Type VIIB submarine was scuttled at Kiel. The wreck was scrapped in 1946–47.
 * U-57 : End of World War II: The Type IIC submarine was scuttled at Kiel, Schleswig-Holstein.
 * U-58 : End of World War II: The Type IIC submarine was scuttled at Kiel.
 * GS U-101 (1940) : End of World War II: The decommissioned Type VIIB submarine was scuttled at Neustadt in Holstein, Schleswig-Holstein. The wreck was later scrapped.
 * GS U-323 : End of World War II: The Type VIIC/41 submarine was scuttled off Nordenham, Lower Saxony (53.5°N, 8.5°W).
 * GS U-339 : World War II: The Type VIIC submarine was scuttled off Wilhelmshaven, Lower Saxony (53.51667°N, 8.16667°W).
 * GS U-428 : World War II: The Type VIIC submarine was scuttled in the Nord-Ostsee Kanal at Audorf, Schleswig-Holstein (54.31667°N, 9.66667°W).
 * GS U-446 : End of World War II: The Type VIIC submarine was scuttled off Kiel (59.31667°N, 10.16667°W) with the loss of 23 of her 41 crew. The wreck was raised in 1947 and scrapped.
 * GS U-475 : End of World War II: The Type VIIC submarine was scuttled off Kiel (59.31667°N, 10.16667°W). The wreck was raised in 1947 and scrapped.
 * GS U-560 : End of World War II: The Type VIIC submarine was scuttled off Kiel. The wreck was scrapped in 1946.
 * GS U-704 : End of World War II: The Type VIIC submarine was scuttled at Vegesack, Bremen. The wreck was scrapped in 1947.
 * GS U-708 : End of World War II: The Type VIIC submarine was scuttled at Wilhelmshaven. The wreck was scrapped in 1947.
 * GS U-748 : End of World War II: The Type VIIC submarine was scuttled at Rendsburg, Schleswig-Holstein.
 * GS U-795 (: End of World War II: The Type XVIIA submarine was scuttled in dry dock at Kiel.
 * GS U-822 : End of World War II: The Type VIIC submarine was scuttled at Wesermünde (53.53333°N, 8.58333°W). The wreck was scrapped in 1948.
 * GS U-828 : End of World War II: The Type VIIC/41 submarine was scuttled at Wesermünde (53.53333°N, 8.58333°W). The wreck was scrapped in 1948.
 * GS U-876 : End of World War II: The Type IXD2 submarine was scuttled at Eckernförde. The wreck was scrapped in 1947.
 * GS U-903 : End of World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped in 1947.
 * GS U-922 : End of World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped in 1947.
 * GS U-924 : End of World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped in 1947.
 * GS U-958 : End of World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped in 1947.
 * GS U-1170 : End of World War II: The Type VIIC/41 submarine was scuttled at Travemünde, Schleswig-Holstein. The wreck was scrapped post-war.
 * GS U-1192 : World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-1196 : End of World War II: The Type VIIC submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-1205 : End of World War II: The Type VIIC submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-1210 : World War II: The Type VIIC submarine was bombed and sunk in the Baltic Sea off Eckernförde (54.46667°N, 9.9°W) in an American air raid.
 * GS U-1227 : The Type IXC/40 submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-1275 : End of World War II: The Type VIIC/41 submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2330 : End of World War II: The Type XXIII submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2332 : End of World War II: The Type XXIII submarine was scuttled at Hamburg. The wreck was scrapped post-war.
 * GS U-2355 : End of World War II: The Type XXIII submarine was scuttled in the Baltic Sea north west of Laboe, Schleswig-Holstein (54.4°N, 10.2°W).
 * GS U-2371 : End of World War II: The Type XXIII submarine was scuttled at Hamburg. The wreck was scrapped post-war.
 * GS U-2501 : End of World War II: The Type XXI submarine was scuttled at Hamburg. The wreck was scrapped post-war.
 * GS U-2503 : World War II: The Type XXI submarine was damaged in the Little Belt in a rocket attack by two Bristol Beaufighter aircraft of 236 and 254 Squadrons, Royal Air Force with the loss of thirteen crew. She was consequently scuttled the next day at 55.61667°N, 10°W).
 * GS U-2504 : End of World War II: The Type XXI submarine was scuttled near Hamburg. The wreck was scrapped post-war.
 * GS U-2508 : End of World War II: The Type XXI submarine was scuttled near Keil. The wreck was scrapped post-war.
 * GS U-2512 : End of World War II: The Type XXI submarine was scuttled at Eckernförde. The wreck was scrapped post-war.
 * GS U-2519 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2520 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2521 : World War II: The Type XXI submarine was sunk in the Flensburg Fjord (54.81667°N, 9.83333°W) by a rocket attack by Hawker Typhoon aircraft of 184 Squadron, Royal Air Force with the loss of all 44 crew.
 * GS U-2524 : World War II: The Type XXI submarine was damaged in the Kattegat by a rocket attack by Bristol Beaufighter aircraft of 236 and 254 Squadrons, Royal Air Force. She was consequently scuttled off Fehmarn (54.43333°N, 11.65°W) with the loss of one crew member.
 * GS U-2533 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2534 : End of World War II: The Type XXI submarine was scuttled east of Fehmarn (54.43333°N, 11.56667°W).
 * GS U-2535 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2536 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-2539 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2543 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2545 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2546 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2548 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-2552 : End of World War II: The Type XXI submarine was scuttled at Kiel (54.35028°N, 10.15167°W). The wreck was scrapped post-war.
 * GS U-3001 : End of World War II: The Type XXI submarine was scuttled in the North Sea north west of Wesermünde. The wreck was scrapped post-war.
 * GS U-3005 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3010 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3011 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3012 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3013 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3014 : End of World War II: The Type XXI submarine was scuttled at Neustadt, Hamburg. The wreck was scrapped post-war.
 * GS U-3023 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3024 : End of World War II: The Type XXI submarine was scuttled at Neustadt. The wreck was scrapped post-war.
 * GS U-3025 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3026 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3027 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3028 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3029 : End of World War II: The Type XXI submarine was scuttled in the Aussenförde, Kiel.
 * GS U-3031 : End of World War II: The Type XXI submarine was scuttled at Kiel.
 * GS U-3032 : World War II: The Type XXI submarine was sunk in the Baltic Sea east of Fehmarn (54.44167°N, 11.53667°W) by a rocket attack by Hawker Typhoon aircraft of 184 Squadron, Royal Air Force with the loss of 36 of her 60 crew.
 * GS U-3037 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3038 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3039 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3040 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3507 : End of World War II: The Type XXI submarine was scuttled at Travemünde. The wreck was scrapped post-war.
 * GS U-3509 : End of World War II: The Type XXI submarine was scuttled in the Weser Estuary.
 * GS U-3511 : End of World War II: The Type XXI submarine was scuttled at Travemünde.
 * GS U-3513 : End of World War II: The Type XXI submarine was scuttled at Travemünde.
 * GS U-3518 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-3530 : End of World War II: The Type XXI submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-4705 : End of World War II: The Type XXIII submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-4712 : End of World War II: The Type XXIII submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * USS YMS-481 : World War II: The auxiliary minesweeper was shelled and sunk off Cape Djoeta, Borneo by Japanese shore-based artillery. Nineteen survivors were rescued by USS Cofer (DE-208).
 * GERMAN DESTROYER Z43 : World War II: The Type 1936B destroyer was scuttled in the Baltic Sea.

4 May

 * GERMAN TANKER Altengamme : World War II: The tanker was bombed and sunk by aircraft off Neu Mukran, Rügen, Germany.
 * MV Black Watch (1938) : World War II: Operation Judgement: The accommodation ship was bombed and sunk at Kilbotn, Troms, Norway by Grumman TBF Avenger and Grumman F4F Wildcat aircraft of 846, 853 and 882 Squadrons, Fleet Air Arm; based on HMS Trumpeter (D09), HMS Queen (D19) and HMS Searcher (D40) (all ) respectively.
 * SS Bolkoburg (🇩🇪 Germany): World War II: The cargo ship was bombed and damaged in the Baltic Sea off Fehmarn, Schleswig-Holstein by Hawker Typhoon aircraft of 193 Squadron, Royal Air Force. She was beached and burnt out.
 * SMS Hummel : World War II: The decommissioned gunboat was bombed and sunk by aircraft at Swinemünde, Germany.
 * USS LCT-1358 :World War II: The Landing Craft, Tank ran aground and sank off California.
 * USS LSM(R)-190 : World War II: The LSM(R)-188-class Landing Ship Medium was sunk in the Pacific Ocean off Okinawa, Japan by a Japanese kamikaze aircraft attack.
 * USS LSM(R)-194 : World War II: The LSM(R)-188-class Landing Ship Medium was sunk in the Pacific Ocean off Okinawa, Japan by a Japanese kamikaze aircraft attack.
 * USS Luce (DD-522) : World War II: The Fletcher-class destroyer was sunk in the Pacific Ocean off the Kerama Islands by a Japanese kamikaze aircraft attack with the loss of 126 of her 312 crew.
 * GERMAN MINESWEEPER M-36 : World War II: The minesweeper was bombed and sunk by aircraft in the Great Belt.
 * GERMAN MINESWEEPER M-301 : World War II: The minesweeper was bombed and sunk by aircraft south of Skjernøy in Mandal, Norway.
 * USS Morrison (DD-560) : World War II: The Fletcher-class destroyer was sunk in the Pacific Ocean off Oshima, Japan (27.16667°N, 127.96667°W) by a kamikaze aircraft attack with the loss of 152 of her 273 crew.
 * GERMAN AUXILIARY CRUISER Orion : World War II: The refugee transport was bombed and sunk by Soviet aircraft off Swinemünde, Germany.
 * USS PGM-17 : World War II: The PGM-9-class gunboat ran aground off Okinawa, refloated later and scuttled.
 * GERMAN MOTOR TORPEDO BOAT S-103 : World War II: The Schnellboot was sunk in an air attack.
 * MV Senja (1938) (🇩🇪 Germany): World War II: Operation Judgement The coaster was bombed and sunk at Kilbotn by Grumman TBF Avenger and Grumman F4F Wildcat of 846, 853 and 882 Squadrons, FAA, based on HMS Trumpeter (D09), HMS Queen (D19) and HMS Searcher (D40) (all ) respectively. Raised in 1947, repaired and returned to service in April 1948.
 * SS Swakopmund (🇩🇪 Germany): World War II: The cargo ship was bombed and sunk off Fehmarn by Hawker Typhoon aircraft of 183 Squadron, RAF.
 * GS U-30 (1936) : Operation Regenbogen: The Type VIIA submarine was scuttled at Flensburg, Schleswig-Holstein. The wreck was raised and scrapped in 1948.
 * GS U-46 (1938) : End of World War II: The Type VIIB submarine was scuttled in Kupfermühlen Bay (54.83333°N, 9.48333°W).
 * GS U-267 : World War II: End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was later scrapped.
 * GS U-393 : World War II: The Type VIIC submarine was attacked in Gelting Bay (54.88333°N, 9.61667°W) by United States Navy aircraft with the loss of two crew. She was scuttled the next day in Flensburger Förde (55.56667°N, 9.81667°W).
 * GS U-711 : World War II: Operation Judgement: The Type VIIC submarine was bombed and sunk at Kilbotn by Grumman TBF Avenger and Grumman F4F Wildcat aircraft of 846, 853 and 882 Squadrons, FAA; based on HMS Trumpeter (D09), HMS Queen (D19) and HMS Searcher (D40) (all ) respectively with, the loss of 40 of her 52 crew.
 * GS U-721 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was later scrapped.
 * GS U-792 : World War II: The Type XVIIA submarine was scuttled off Rendsborg, Schleswig-Holstein (54.31667°N, 9.71667°W).
 * GS U-793 : End of World War II: The Type XVIIA submarine was scuttled off Rendsborg (54.31667°N, 9.71667°W).
 * GS U-904 : End of World War II: The Type VIIC submarine was scuttled at Eckernförde (54.46667°N, 9.85°W).
 * GS U-1132 : World War II: End of World War II: The Type VIIC submarine was scuttled in Küpfermühlen Bay. The wreck was scrapped post-war.
 * GS U-1161 : End of World War II: The Type VIIC submarine was scuttled in Küpfermühlen Bay. The wreck was scrapped post-war.
 * GS U-1168 : End of World War II: The Type VIIC/41 submarine ran aground in Gelting Bay (54.8°N, 9.8°W) and was scuttled.
 * GS U-1303 : End of World War II: The Type VIIC submarine was scuttled in Küpfermühlen Bay. The wreck was scrapped post-war.
 * GS U-1304 : End of World War II: The Type VIIC submarine was scuttled in Küpfermühlen Bay. The wreck was scrapped post-war.
 * GS U-2338 : World War II: The Type XXIII submarine was sunk in the Øresund off Copenhagen (55.56667°N, 9.81667°W by Bristol Beaufighter aircraft of 236 and 256 Squadrons, Royal Air Force with the loss of twelve of her thirteen crew.
 * GS U-2540 : End of World War II: The Type XXI submarine was scuttled in the Baltic Sea off the Flensburg Lightship (🇩🇪 Germany). She was raise in 1957, repaired and entered Bundesmarine service in September 1960 as Wilhelm Bauer.
 * GS U-3033 (: Endo of World War II: The Type XXI submarine was scuttled in Wasserleben Bay. The wreck was scrapped post-war.
 * GS U-3034 (: Endo of World War II: The Type XXI submarine was scuttled in Wasserleben Bay. The wreck was scrapped post-war.
 * GS U-4709 : End of World War II: The Type XXIII submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * GS U-4711 : End of World War II: The Type XXIII submarine was scuttled at Kiel. The wreck was scrapped post-war.
 * MV Wega : World War II: Evacuation of East Prussia: The ocean liner was bombed and damaged in the Baltic Sea off Fehmarn by Hawker Typhoon aircraft of 183 Squadron, RAF. She was set on fire and was beached at Staberhuk with the loss of one crew member. The wreck was scrapped in 1948, with the engines being reused in SS Haukefjell (1941) and SS Kollgrim (both 🇳🇴 Norway).
 * MS Wolfgang L.M. Russ (🇩🇪 Germany): World War II: The cargo ship struck a mine and sank off Aarhus, Denmark. Raised and broken up in May 1955.

5 May

 * SS Black Point (🇺🇸 United States): World War II: The collier was torpedoed and sunk in the Atlantic Ocean 5 nmi east of Point Judith, Rhode Island (41.31667°N, -71.38333°W) by GS U-853 with the loss of twelve of her 46 crew. Survivors were rescued by SS Karmen (1896) ( Kingdom of Yugoslavia), MV Scandinavia (1937) (🇸🇪 Sweden) and United States Navy crash boats. Black Point was the last American ship sunk by a Kriegsmarine U-boat.
 * HMT Coriolanus : World War II: The  was mined and sunk in the Adriatic Sea.
 * JAPANESE OILER Dainan Maru : World War II: The (A.K.A. Okusu Maru) was damaged off Koro Jima by US Navy aircraft. Beached northeast of Kona on Koratsu on 9 May 1945.
 * MV Empire Unity (🇬🇧 United Kingdom): World War II: Convoy RU 161: The tanker was torpedoed and damaged in the Atlantic Ocean 14 nmi west north west of Akranes, Iceland (64.38333°N, -22.61667°W) by GS U-979 . She was abandoned by her 46 crew, but later reboarded by 34 of them. The others were rescued by HMT Northern Sky . Empire Unity was towed to Hvalfjordur by HMT Northern Spray (FY129) . Later repaired and returned to service.
 * GERMAN GUNBOAT K-1 : World War II: The gunboat was bombed and sunk by aircraft off Aarhus, Denmark.
 * HMS ML 558 : World War II: The Fairmile B motor launch was mined and sunk  in the Adriatic Sea off Novigrad.
 * S18 : World War II: the fast tug (former E-boat) was sunk by a bomb.
 * GERMAN MOTOR TORPEDO BOAT S-170 : World War II: The Schnellboot was blown up at Lubeck.
 * GERMAN TORPEDO BOAT T-36 : World War II: The torpedo boat, having been damaged by a mine the previous day, was bombed and sunk by aircraft off Swinemünde, Germany.
 * U-17 : End of World War II: The Type IIB submarine was scuttled at Wilhelmshaven, Lower Saxony.
 * GS U-38 (1938) : End of World War II: The Type IXA submarine was scuttled west of Wesermünde, Bremen (53.56667°N, 8.53333°W. The wreck was scrapped in 1948.
 * GS U-236 : End of World War II: The Type VIIC submarine was scuttled off Schleimünde, Schleswig-Holstein.
 * GS U-349 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay with the loss of one crew member.
 * GS U-351 : End of World War II: The Type VIIC submarine was scuttled at Horup Haff (54.88333°N, 9.83333°W). The wreck was raised and scrapped in 1948.
 * GS U-370 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay.
 * GS U-397 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay.
 * GS U-534 (: World War II: The Type IXC/40 submarine was depth charged and sunk in the Kattegat (56.65°N, 11.8°W) by Consolidated B-24 Liberator aircraft of 86 Squadron, Royal Air Force with the loss of three of her 42 crew.
 * GS U-579 : World War II: The Type VIIC submarine was depth charged and sunk in the Kattegat east of Aarhus, Denmark (56.16667°N, 11.06667°W) by Consolidated B-24 Liberator aircraft of 547 Squadron Royal Air Force with the loss of 24 crew.
 * GS U-733 : End of World War II: The Type VIIC submarine was scuttled in Flensburg Fjord (54.8°N, 9.81667°W). The wreck was scrapped in 1948.
 * GS U-746 : World War II: The Type VIIC submarine was bombed and damaged in Gelting Bay and was consequently scuttled. The wreck was scrapped in 1948.
 * GS U-750 : End of World War II: The Type VIIC submarine was scuttled in Flensburg Fjord (54.83333°N, 9.5°W).
 * GS U-794 : End of World War II: The Type XVIIA submarine was scuttled in Gelting Bay.
 * GS U-827 : End of World War II: The Type VIIC/41 submarine was scuttled in Flensburg Fjord. The wreck was scrapped in 1948.
 * GS U-999 : End of World War II: The Type VIIC/41 submarine was scuttled in Gelting Bay.
 * GS U-1008 : World War II: The Type VIIC/41 submarine was depth charged and damaged in the Kattegat by a Consolidated B-24 Liberator aircraft of 86 Squadron, Royal Air Force with the loss of six of her 50 crew. She was consequently scuttled the next day (56.23333°N, 10.85°W).
 * GS U-1016 : End of World War II: The Type VIIC/41 submarine was scuttled in Lübeck Bay.
 * GS U-1025 : End of World War II: The Type VIIC/41 submarine was scuttled in Flensburger Förde. The wreck was scrapped post-war.
 * GS U-1056 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay.
 * GS U-1101 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1162 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1193 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1204 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1207 : End of World War II: The Type VIIC submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1223 : End of World War II: The Type IXC/40 submarine was scuttled in the Baltic Sea west of Wesermünde (53.53333°N, 8.58333°W).
 * GS U-1234 : End of World War II: The Type IXC/40 submarine was scuttled at Hörup, Schleswig-Holstein.
 * GS U-1306 : End of World War II: The Type VIIC/41 submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-1405 : End of World War II: The Type XVIIB submarine was scuttled in Eckernförde Bay. The wreck was scrapped post-war.
 * GS U-2333 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2339 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2343 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2346 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2347 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2349 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2352 : End of World War II: The Type XXIII submarine was scuttled at Hörup. The wreck was scrapped post-war.
 * GS U-2357 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2358 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2360 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2362 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2364 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2366 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2367 : The Type XXIII submarine collided with another U-boat in Gelting Bay (approximately 55°N, -11°W) and sank. She was raised in August 1956, repaired and commissioned into the Bundesmarine on 1 October 1957 as U-Hecht.
 * GS U-2368 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2369 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2507 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2517 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2522 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2525 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2541 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-2544 : End of World War II: The Type XXI submarine was scuttled in the Skagerrak east north east of Aarhus, Denmark (56.10139°N, 10.4525°W). The wreck was raised in 1952 and scrapped.
 * GS U-2551 : The Type XXI submarine ran aground in the Baltic Sea off Flensburg (54.81667°N, 9.46667°W). The wreck was blown up by the Royal Navy on 23 July.
 * GS U-3015 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3022 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3044 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3501 : End of World War II: The Type XXI submarine was scuttled in the Weser Estuary. The wreck was scrapped post-war.
 * GS U-3510 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3524 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3526 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-3527 : End of World War II: The Type XXI submarine was scuttled in the Weser Estuary. The wreck was scrapped post-war.
 * GS U-3528 : End of World War II: The Type XXI submarine was scuttled in the Weser Estuary. The wreck was scrapped post-war.
 * GS U-3529 : End of World War II: The Type XXI submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-4701 : End of World War II: The Type XXIII submarine was scuttled at Hörup 55.71667°N, 10.18167°W). The wreck was scrapped post-war.
 * GS U-4702 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay 55.8°N, 9.81667°W). The wreck was scrapped post-war.
 * GS U-4703 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-4704 : End of World War II: The Type XXIII submarine was scuttled at Hörup 54.9°N, 9.83333°W). The wreck was scrapped post-war.
 * GS U-4707 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * GS U-4710 : End of World War II: The Type XXIII submarine was scuttled in Gelting Bay. The wreck was scrapped post-war.
 * JAPANESE MINESWEEPER W-20 : World War II: The  was torpedoed and sunk in the Yellow Sea by USS Trepang (SS-412).

6 May

 * GERMAN MOTOR TORPEDO BOAT S-226 : World War II: The Schnellboot was sunk in an air attack.
 * GS U-853 : World War II: The Type IXC/40 submarine was depth charged, hedgehogged and sunk in the Atlantic Ocean off Point Judith, Rhode Island, United States (41.21667°N, -71.45°W) by USS Atherton (DE-169) and USS Moberly (PF-63) (both ) with the loss of all 55 crew.
 * GS U-881 (: World War II: The Type IXC/40 submarine was depth charged and sunk in the Atlantic Ocean (43.3°N, -47.73333°W) by USS Farquhar (DE-139) with the loss of all 54 crew.
 * GS U-3523 : World War II: The Type XXI submarine was depth charged and sunk in the Skagerrak (57.86667°N, 10.81667°W) by a Consolidated B-24 Liberator aircraft on 86 Squadron, Royal Air Force with the loss of all 58 crew.

7 May

 * SS Avondale Park (🇬🇧 United Kingdom): World War II: Convoy EN 491: The cargo ship was torpedoed and sunk in the North Sea (56.08333°N, -2.53333°W) by GS U-2336 ( with the loss of two of her 38 crew.
 * SS Kashima Maru (🇯🇵 Japan) World War II: The cargo ship struck a mine and was beached in the Kanmon Strait, (33.9°N, 130.86667°W).
 * GERMAN MINESWEEPER M-22 : World War II: The minesweeper was scuttled off Kiel, Germany.
 * HNOMS NYMS 382 : World War II: The YMS-1 class minesweeper was torpedoed and sunk off Lyme Bay by GS U-1023. 22 crewmen were killed, with 10 survivors rescued by HNOMS NYMS 379, HNOMS NYMS 380 and HNOMS NYMS 381 (all ).
 * GERMAN MOTOR TORPEDO BOAT S-191 and GERMAN MOTOR TORPEDO BOAT S-301 (both): World War II: The Schnellboots sank each other in a collision.
 * SS Sneland I (1922) (🇳🇴 Norway): World War II: Convoy EN 491: The cargo ship was torpedoed and sunk in the North Sea 56.16°N, -2.52333°W) by GS U-2336 with the loss of seven of her 29 crew. Survivors were rescued by HMT Leicester City (FY223) and HMT Valse (T151) (both ).
 * SS Teika Maru (🇯🇵 Japan) World War II: The cargo ship struck a mine and was run aground west of Shimonoseki, Japan (34.1°N, 130.78333°W). 3 crewmen killed.
 * GS U-1406 : End of World War II: The Type XVIIB submarine was scuttled at Cuxhaven, Lower Saxony. The wreck was later raised and used by the United States Navy. Scrapped in 1948.
 * GS U-1407 : End of World War II: The Type XVIIC submarine was scuttled at Cuxhaven. She was salvaged by the Royal Navy, repaired and entered service as HMS Meteorite. Scrapped in September 1949.
 * JAPANESE MINESWEEPER W-29 : World War II: The  was mined and sunk in the Kanmon Strait (34.03333°N, 130.9°W). 43 crewmen were listed as missing.

8 May

 * SS Horace Binney (🇺🇸 United States): World War II: The Liberty ship struck a mine in the North Sea off Vlissingen, Zeeland, Netherlands. She was beached at Deal, Kent, United Kingdom but broke in two, a total loss.
 * GS U-37 (1938) : End of World War II: The Type IXA submarine was scuttled in Sonderberg Bay (54.91667°N, 9.78333°W). The wreck was later scrapped.
 * GS U-320 : World War II: The Type VIIC/41 submarine was depth charged and damaged in the North Sea off Bergen, Hordaland, Norway (61.53333°N, 1.88333°W) by a Consolidated PBY Catalina aircraft of 210 Squadron, Royal Air Force. She was consequently scuttled off Sotre Island.
 * GS U-382 : End of World War II: The Type VIIC submarine was scuttled at Wilhelmshaven, Lower Saxony.
 * GS U-2365 : End of World War II: The Type XXIII submarine was scuttled in the Kattegat north west of Anholt Island, Denmark (56.85°N, 11.81667°W). She was raised in June 1956, repaired and commissioned into the Bundesmarine as U-Hai on 15 August 1957.
 * GS U-2538 : End of World War II: The Type XXI submarine was scuttled off Ærø, Denmark (54.88472°N, 10.25194°W). The wreck was scrapped in 1950.
 * GS U-3030 : End of World War II: The Type XXI submarine was scuttled in Eckerförder Bay (54.51333°N, 10.10333°W).
 * GS U-3503 : End of World War II: The Type XXI submarine was scuttled in the Kattegat west of Gothenburg, Sweden (57.65°N, 11.73333°W). The wreck was raised in 1946 and scrapped.

9 May

 * HMS ML 591 : World War II: The Fairmile B motor launch sank in the Sittaung River, Burma.
 * HMS ML 905 : World War II: The Fairmile B motor launch sank in the Sittaung River, Burma.
 * USS Oberrender (DE-344) : World War II: The John C. Butler-class destroyer escort was damaged in the Pacific Ocean off Okinawa, Japan by a kamikaze aircraft attack with the loss of 24 of her 215 crew. She was towed to the Kerama Islands but was declared beyond repair. Her hulk was sunk as a target on 6 November.
 * Strelnieks ( Nazi Germany): World War II: The Tug was shelled and sunk off Gotland, Sweden by Soviet Navy vessels. Two schooners and a barge were scuttled by the Soviets.

10 May

 * GERMAN SUPPORT SHIP Carl Peters : The E boat support ship struck a mine and sank off Geltinger Bucht, Germany.
 * JAPANESE TRANSPORT Tatsuwa Maru : World War II: The transport struck a mine and sank off Shimonoseki. Raised in 1946 and repaired by 1949 and put in commercial service.

11 May

 * SS Aitoku Maru (🇯🇵 Japan): World War II: The Transport was bombed and sunk in Kataoka Bay, Shimushu Ialand by 11th Air Force B-24s.

13 May

 * MV Steiner (🇳🇴 Norway): The coaster struck a mine and sank in Sognefjord with the loss of one crew member.
 * JAPANESE OILER Yosei Maru : World War II: The Yosei Maru class oiler was torpedoed and sunk in the Java Sea (-6.51667°N, 111.31667°W) by USS Baya (SS-318) . 16 Crewmen were killed.

14 May

 * SS Dai Maru ( Empire of Japan): World War II: The cargo ship was bombed and sunk by aircraft off Makassar, Dutch East Indies.
 * JAPANESE HOSPITAL SHIP Baikal Maru : World War II: The hospital ship ran aground off Himeshima. Refloated and repaired sometime in 1945 and put in commercial service post War.

15 May

 * SS Tottori Maru (🇯🇵 Japan): World War II: The Transport was torpedoed and sunk in the Gulf of Thailand (9.96667°N, 101.08333°W). by USS Hammerhead (SS-364) . 52 crewmen killed. 19 survivors rescued by JAPANESE MINELAYER Hatsutaka.

16 May

 * SS Eiju Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea by USS Raton (SS-270).
 * JAPANESE CRUISER Haguro : World War II: Battle of the Malacca Strait: The Myōkō-class cruiser was torpedoed, shelled and sunk in the Malacca Strait 55 nmi off Penang, Malaya by Royal Navy Destroyers.
 * JAPANESE MINELAYER Hatsutaka : World War II: The was torpedoed and sunk in the Gulf of Thailand (4.81667°N, 103.51667°W) by USS Hawkbill (SS-366)  . She sank a half mile off shore, survivors refused rescue by USS Hawkbill (SS-366) and an unknown number of survivors, including her C.O., swam to shore.
 * GS U-287 : The Type VIIC submarine struck a mine and sank in the Elbe Estuary.

17 May

 * SS Chosan Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Yellow Sea or East China Sea by USS Shad (SS-235).
 * SS Tairyu Maru : World War II: The Peacetime Standard Type transport was sunk in the Inland Sea 3 miles south east of the Wada-misaki Lighthouse (34.6°N, 135.21667°W) near Kobe by a mine. Salvaged post War.

18 May

 * SS Enkyo Maru : World War II: The Cargo ship was bombed and sunk by US Navy PB4Ys off Saishu-To, Chosen, Korea (33.23333°N, 120.83333°W). 24 crew members were lost. 2,400 passengers are rescued by JAPANESE ESCORT SHIP CD-81.
 * USS Longshaw (DD-559) : World War II: The Fletcher-class destroyer ran aground off Naha, Okinawa, Japan. She was shelled and damaged by Japanese shore-based artillery and was abandoned with the loss of 86 of her 273 crew. She was later scuttled by United States Navy warships.

19 May

 * SS Daishin Maru (🇯🇵 Japan): World War II: The cargo ship was sunk in the western half of the Tsushima Strait in a collision with JAPANESE CRUISER Kashima.

20 May

 * USS LST-808 : World War II: The LST-1-class tank landing ship  was damaged by a Kamakaze and abandoned off Okinawa (26.7°N, 127.78333°W). Ship grounded off Ie Jima and the wreck was destroyed 11 November 1945.
 * GS U-963 : End of World War II: The Type VIIC submarine was scuttled off Nazaré, Portugal (39.6°N, -9.08333°W). All 48 crew survived.

21 May

 * JAPANESE MINESWEEPER W-34 : World War II: The  was torpedoed and sunk in the Java Sea off Kepulauan, Java (-6.3°N, 116.23333°W)  by USS Chub (SS-329) . 78 survivors rescued, 20 crewmen killed, 25 wounded, 2 missing.

22 May

 * JAPANESE SUBMARINE CHASER CH-37 : World War II: The was sunk in the East China Sea west of the Satsunan Islands(29.75°N, 129.16667°W) by US Navy aircraft from USS Bennington (CV-20)  and USS Hornet (CV-12)
 * JAPANESE SUBMARINE CHASER CH-58 : World War II: The  was  sunk in the East China Sea  west of the Satsunan Islands  (29.75°N, 129.16667°W)  by US Navy aircraft from USS Bennington (CV-20)  and USS Hornet (CV-12)
 * JAPANESE GUNBOAT Hashidate : World War II: The  was torpedoed and sunk in the South China Sea southwest of Luzon, The Philippines (12.3°N, 117.2°W)  by USS Picuda (SS-382)  while towing Tsukuba Maru.
 * GERMAN MINESWEEPER M-515 : World War II: The Type M 1915 minesweeper was mined and sunk at Fehmarn.
 * JAPANESE LANDING SHIP NO. 173 T-173 : World War II: The  was  sunk in the East China Sea  west of the Satsunan Islands    (29.75°N, 129.16667°W)  by US Navy aircraft from USS Bennington (CV-20)  and USS Hornet (CV-12)
 * SS Tsukuba Maru (🇯🇵 Japan): World War II: The cargo ship's engine room was damaged by near misses by four 14th Air Force B-24s on May 20. She was torpedoed and severely damaged in the South China Sea southwest of Luzon, The Philippines (12.3°N, 117.2°W) by USS Picuda (SS-382)  while being towed by JAPANESE GUNBOAT Hashidate . She was finished off by US Army aircraft the next day.

24 May

 * GS U-979 : End of World War II: The Type VIIC submarine ran aground and was scuttled at Amrum, Schleswig-Holstein (54.63333°N, 8.38333°W).

25 May

 * USS Barry (DD-248) : World War II: The high-speed transport, a former Clemson-class destroyer, was damaged in the Pacific Ocean 35 nmi north west of Okinawa, Japan by a kamikaze aircraft and was abandoned without loss of crew. She was declared a constructive total loss and subsequently used as a decoy, being sunk at Kerama Retto on 21 June by a further kamikaze attack.
 * USS Bates (DE-68) : World War II: The high-speed transport, a former Buckley-class destroyer escort, was sunk in the Pacific Ocean 2 nmi south of Ie Shima, Okinawa by three Japanese kamikaze aircraft with the loss of 21 of her 213 crew.
 * SS Brazil Maru : World War II: The Daifuku Maru No. 1 class transport was sunk in the Inland Sea 1.5 miles off the Wada-misaki Lighthouse near Kobe by a mine.
 *  S.S. William B. Allison (🇺🇸 United States): World War II: The Liberty ship was torpedoed and damaged in the Pacific Ocean by Japanese Aircraft. 1 stevedore and 6 crewmen killed. She was towed to Okinawa and beached. Declared a constructive total loss. 30 July, 1945 commissioned as USS Inca for use as a dry storage hulk, later sank in a Typhoon. Raised, and sold for scrapping by a Chinese company in 1948.
 * USS LSM-135 : World War II: The LSM-1-class landing ship medium was sunk in the Pacific Ocean off the Ryukyu Islands by a Japanese kamikaze aircraft. Eleven survivors were rescued by USS Fleming (DE-32).
 * SS Nittei Maru (🇯🇵 Japan): World War II: The cargo ship was sunk off Borneo.

26 May

 * USS PC-1603 : World War II: The Patrol Craft/Sub Chaser, a former Adroit-class minesweeper, was heavily damaged in the Pacific Ocean off Okinawa, Japan by  Japanese kamikaze aircraft and not repaired. Decommissioned and sunk as a breakwater post war. 3 Crewmen killed and 15 wounded.

28 May

 * JAPANESE ESCORT CD-29 : World War II: The Type C escort ship struck a mine off Sasebo causing extensive damage to her engines, not repaired and scrapped post-war.
 * USS Drexler (DD-741) : World War II: The Allen M. Sumner-class destroyer was sunk in the Pacific Ocean off Okinawa, Japan (27.1°N, 127.63333°W) by two Japanese kamikaze aircraft with the loss of 158 of her 336 crew.

29 May

 * HMS LCT 357 : World War II: The (LCT (Mk 3)-class Landing Craft, Tank) was sunk by an explosion at Suda Bay, Crete.
 * SS Kuretake Maru (1938) (🇯🇵 Japan): World War II: The cargo ship was torpedoed and damaged in the Sea of Okhotsk east of Sakhalin (46.6°N, 144.36667°W) by USS Sterlet (SS-392) . She sinks the next day. 272 troops and 6 crewmen killed. 400 survivors rescued by JAPANESE ESCORT Shimushu.
 * SS Tenryo Maru (🇯🇵 Japan): World War II: The cargo ship was torpedoed and sunk in the Pacific Ocean by USS Sterlet (SS-392) . 773 men of the 23rd Air Defence Battalion, 26 Gunners and 83 crewmen killed.
 * MS Tsuruga Maru (1938) (🇯🇵 Japan): World War II: The cargo ship struck a mine and sank off Niigata, Japan.

31 May

 * SS Hebrides (🇬🇧 United Kingdom): The cargo ship was beached in Gunna Sound, Inner Hebrides.
 * JAPANESE SUBMARINE I-361 : World War II: The I-361 class submarine   was  torpedoed  and sunk in the Pacific Ocean 400 miles southeast of Okinawa (20.36667°N, 134.15°W) by a TMB Avenger from USS Anzio (CVE-57) . 76 crewmen and 5 Kaiten pilots killed.

Unknown date

 * SS Edmund F. Dickens (🇺🇸 United States): World War II: The Liberty ship struck a mine and was damaged in the Pacific Ocean. She was declared a constructive total loss.
 * GERMAN MINESWEEPER M-18 : World War II: The minesweeper was scuttled at Kiel, Germany, sometime in May 1945. Later scrapped.
 * GERMAN MINESWEEPER M-120 : World War II: The minesweeper was bombed and sunk by aircraft at La Spezia.
 * SS Samlistar (🇬🇧 United Kingdom): The cargo ship ran aground off Quebec, Canada. Refloated and arrived at Quebec City on 31 May.
 * Nymphe : End of World War II: The flak ship ran aground north of Narvik, Norway whilst being returned to the Royal Norwegian Navy
 * GS U-290 : End of World War II: The Type VIIC submarine was scuttled in Kupfermühlen Bay.
 * USS YC-961 : World War II: The non-self-propelled Covered Lighter was lost from grounding at Biorka Island, Alaska Territory sometime in May, 1945 or July, 1944.
 * USS YO-156 and USS YO-157 : World War II: The self-propelled fuel oil barges were lost at Sitka, Alaska Territory, sometime in May.