U-44 (Kriegsmarine Type IXA submarine): Struck a mine in the North Sea north of Terschelling, the Netherlands and sank.
Tama Maru No. 2 (IJN auxiliary minesweeper, former whaler): Sank off New Guinea due to damage inflicted on her by aircraft from USS Lexington and USS Yorktown on 10 March.
Kasuga Maru No. 2 (IJN auxiliary transport): Torpedoed and sunk in Port Blair Harbor, Andaman Islands, in the Indian Ocean by HNLMS O 21.
No. 92 (Soviet Navy G-5-class motor torpedo boat): Lost on this date.
U-163 (Kriegsmarine Type IXC submarine): Depth charged and sunk in the Atlantic Ocean northwest of Cape Finisterre, Spain by HMCS Prescott.
M 3113 (Kriegsmarine KSK-2-class naval drifter/minesweeper): Lost on this date.
Tatsuta (IJN Tenryū-class light cruiser): Torpedoed and sunk in the Pacific Ocean south of Hachijō-jima by USS Sand Lance.
U-575 (Kriegsmarine Type VIIC submarine): Depth charged, shelled and sunk in the Atlantic Ocean by HMCS Prince Rupert, USS Haverfield, USS Hobson and aircraft from USS Bogue and the RAF.
CD-66 (IJN Type D escort): Sunk in the South China Sea east of Swatow, China by USAF aircraft.
Keihin Maru (IJN auxiliary submarine chaser): Torpedoed and sunk in the Java Sea by USS Bream.
HMS Sealion (RN S-class submarine, decommissioned): Scuttled as an ASDIC target off the Isle of Arran, Scotland.
UJ 320 (Kriegsmarine KSK-2-class naval drifter/submarine chaser): Sank due to damage she took the day before from Soviet aircraft.
UJ 1414 Treff I (Kriegsmarine naval whaler/auxiliary submarine chaser): Shelled and sunk at Lorient, Morbihan, France by Allied shore-based artillery.