List of shipwrecks in April 1940

The list of shipwrecks in April 1940 includes all ships sunk, foundered, grounded, or otherwise lost during April 1940. Most of the ships listed here were lost in connection with World War II.

2 April

 * SS Signe (🇫🇮 Finland): World War II: Convoy HN 23A: The cargo ship straggled behind the convoy. She was torpedoed and sunk in the North Sea east of the Orkney Islands, United Kingdom by GS U-38 (1938) with the loss of all nineteen crew.

3 April

 * Gorspen (🇬🇧 United Kingdom): World War II: The trawler was bombed and severely damaged in the North Sea 20 nmi east by south of Muckle Flugga, Shetland Islands by a Heinkel He 111 aircraft of KG26, Luftwaffe and was abandoned by her crew. The Luftwaffe claimed she was sunk.
 * SS Produce (1905) (🇳🇴 Norway): The cargo ship ran aground in the Paracel Islands and was wrecked.
 * Sansonnet (🇬🇧 United Kingdom): World War II: The trawler was bombed and sunk in the North Sea 18 nmi east by south of Muckle Flugga by a Luftwaffe aircraft.

5 April

 * MV Bjørnhaug (1921) (🇳🇴 Norway): The cargo ship ran aground at Fife Ness, Fife, United Kingdom and was wrecked.

6 April

 * MV Esso Belgium (🇧🇪 Belgium): The tanker ran aground in the North Sea 5 nmi off Nieuwpoort, West Flanders.
 * HMT Leonora (GY20) (🇬🇧 United Kingdom): The trawler sank in the North Sea 60 nmi east of Scarborough, Yorkshire.
 * MV Navarra (1921) (🇳🇴 Norway): World War II: Convoy HN 10B: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Orkney Islands, United Kingdom (approximately (59°N, -4°W) by GS U-59 (1939) with the loss of twelve of the 26 people on board. Survivors were rescued by SS Atlas (1901) (🇫🇮 Finland).
 * GS U-1 (1935) : World War II: The Type IIA submarine reported by radio from the North Sea. No further trace
 * GS U-50 (1939) : World War II: The Type VIIB submarine struck a mine in the North Sea north of Terschelling, Friesland, Netherlands and sank with the loss of all 44 crew.

7 April

 * SS Curityba (🇩🇪 Germany): The cargo ship ran aground at Kullen, Sweden.
 * SS Elling (🇳🇴 Norway): The coaster ship sprang a leak and sank at Lindesnes, Vest-Agder. Later raised, repaired and returned to service.

8 April

 * HMS Glowworm (H92) : World War II: Operation Weserübung: The G-class destroyer was shelled and sunk in the Norwegian Sea north west of Trondheim, Norway while ramming the heavy cruiser GERMAN CRUISER Admiral Hipper with the loss of 115 of her 149 crew.
 * SS Okeania (🇬🇷 Greece): World War II: The cargo ship struck a mine and sank in the North Sea (51.3°N, 2.06667°W) with the loss of one crew member. The survivors were rescued by HMS Boadicea (H65) and SS Beverland (🇳🇱 Netherlands).
 * MS Rio de Janeiro (1914) : World War II: Operation Weserübung: The troopship was torpedoed and sunk off Lillesand, Norway (58.13°N, 8.49°W) by ORP Orzeł   with the loss of about 200 of the 380 people on board. Survivors were rescued by HNOMS Gyller (1938) and HNOMS Odin (1939) (both ) and various fishing boats.
 * MV Posidonia (1939) : World War II: The naval tanker was torpedoed and sunk on her maiden voyage off Stavern, Norway (58.9°N, 10.35°W) by HMS Trident (N52) . She was salvaged in June 1940, repaired and re-entered service as Stedingen.

9 April

 * HNOMS A-2 : World War II: The A-class submarine was attacked by R-22 and R-23 (both ) in Oslofjord off Tønsberg and was damaged beyond repair.
 * HNOMS Æger (1936) : World War II: Operation Weserübung: The was bombed and sunk off Stavanger by Luftwaffe aircraft with the loss of eight of her 75 crew.
 * SS Amasis (1923) (🇩🇪 Germany): World War II: The cargo ship was torpedoed and sunk off Måseskär, Sweden (58.21667°N, 11.21667°W) by HMS Sunfish (81S) . All 51 crew were rescued.
 * GERMAN CRUISER Blücher : World War II: Battle of Drøbak Sound: The was sunk in Oslofjord, Norway by Norwegian coastal artillery and shore-based torpedoes with the loss of around 1,000 of her 1,382 crew.
 * SS Bockenheim (1924) ( Nazi Germany): World War II: Operation Weserübung: The cargo ship was scuttled off Narvik, Norway by her crew who mistakenly believed that the German destroyers attacking Narvik were British.
 * Dagny (🇸🇪 Sweden): World War II: The fishing vessel struck a mine and sank north of Hantsholm, Norway with the loss of six crew.
 * HNOMS Eidsvold : World War II: First battle of Narvik: The was torpedoed off Narvik by GERMAN DESTROYER Z21 Wilhelm Heidkamp  and sunk with the loss of 175 of her 181 crew.
 * HMS Gurkha (F20) : World War II: Operation Weserübung: The destroyer was bombed and sunk in the North Sea south east of Bergen, Norway by Luftwaffe aircraft with the loss of 15 of her 219 crew.
 * GERMAN CRUISER Karlsruhe : World War II: Operation Weserübung: The Königsberg-class cruiser was torpedoed in the Skagerrak near Kristiansand, Norway HMS Truant (N68) and severely damaged. She was subsequently scuttled by GERMAN TORPEDO BOAT Greif.
 * MS Kattegat (1928) : World War II: The naval tanker was scuttled in Glomfjord, Ørnes, Norway whilst under attack from HNOMS Nordkapp.
 * SS Main (1927) : World War II: Operation Weserübung: The supply ship was captured in the North Sea, off Haugesund, Norway by HNOMS Draug (1908) . She was later bombed and severely damaged by Luftwaffe aircraft and was scuttled by HNoMS Draug.
 * HNOMS Norge : World War II: First Battle of Narvik: The was torpedoed and sunk off Narvik by GERMAN DESTROYER Z11 Bernd von Arnim  with the loss of 101 of her 191 crew.
 * GERMAN MINESWEEPER R 17 : World War III: The R boat was shelled and sunk off Horten, Norway by HNOMS Rauma (1939) and HNOMS Olav Tryggvason (both ).
 * MS Roda (1928) : World War II: Operation Weserübung: The supply ship was captured off Stavanger, Norway by HNOMS Æger (1936) and sunk.
 * SS Sao Paulo (1921) : World War II: Operation Weserübung: The supply ship struck a mine off Bergen, Norway (60.5°N, 5.16667°W) and sank.
 * MS Seattle (1928) (🇩🇪 Germany): World War II: Operation Weserübung: The cargo liner was sunk off Kristiansand, Norway by Norwegian coastal artillery.
 * MS Sørland (1920) (🇳🇴 Norway): World War II: Battle of Drøbak Sound: The cutter was shelled and set on fire in Oslofjord by R-18 and R-19 (both ) and was beached with the loss of two of her five crew. She was a total loss.
 * HNOMS Tor (1939) : World War II: Operation Weserübung: The was scuttled off Fredrikstad to avoid capture by German forces. She was salvaged by the Germans, repaired and entered service as Tiger. She survived the war and was taken back into Royal Norwegian Navy service as Tor in 1945.

10 April

 * SS Aachen (1923) (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, Norway in a battle between British and German destroyers.
 * GERMAN TORPEDO BOAT Albatros : World War II: The Raubvogel-class torpedo boat ran aground in Oslofjord, Norway whilst engaged in a battle with Oslofjord Fortress and was wrecked.
 * SS Altona (1921) (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * SS Antares (1937) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the Skaggerak off Lysekil, Sweden (58.18333°N, 11.28333°W) by HMS Sunfish (81S).
 * Anton Schmitt : World War II: First Battle of Narvik: The was torpedoed and sunk in the Norwegian Sea off Narvik, Norway by HMS Hunter (H35).
 * SS Blythmoor (🇬🇧 United Kingdom): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, Norway, in a battle between British and German destroyers.
 * SS Boden (🇸🇪 Sweden): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * SS Elrid (1915) (🇳🇴 Norway): World War II: First Battle of Narvik: The cargo ship was sunk off in the Norwegian Sea Narvik, in a battle between British and German destroyers.
 * SS Friedenau (1920) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the Skaggerak off the Pater Noster Lighthouse, Sweden by HMS Triton (N15).
 * SS Frielinghaus (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * HMS Hardy (1936) : World War II: First Battle of Narvik: The H-class destroyer was shelled, damaged and beached in Ofotfjord, Norway. She subsequently capsized and sank with the loss of 36 of her 175 crew.
 * SS Hein Hoyer (1937) (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * HMS Hunter (H35) : World War II: First Battle of Narvik: The H-class destroyer was shelled, damaged and ran aground in Ofotfjord, Norway. She was then rammed by HMS Hotspur (H01) and sunk with the loss of 122 of her 166 crew.
 * Ines (🇸🇪 Sweden): World War II: The fishing vessel struck a mine and sunk in the Skaggerak north west of Hantsholm, Norway with the loss of all six crew.
 * GERMAN CRUISER Königsberg : World War II: Operation Weserübung: The cruiiser was bombed and sunk at Bergen, Norway by Blackburn Skua of 800 and 803 Naval Air Squadron, Fleet Air Arm.
 * SS Martha Heindrik Fisser (1911) (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * SS Muansa (🇩🇪 Germany): World War II: The cargo ship struck a mine and sunk in Oslofjord.
 * MV Neuenfels (1925) (🇩🇪 Germany): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * SS Planet (1922) (🇩🇪 Germany): World War II: The cargo ship was scuttled beneath GERMAN TANKER Jan Wellem to protect the latter against torpedoes; this occurred off Narvik, Norway.
 * SS Rauenfels (1928) : World War II: Operation Weserübung: The supply ship was shelled and sunk in Ofotfjord, near Narvik, Norway by HMS Havock (H43) and HMS Hostile (H55) (both ).
 * SS Romansby (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Norwegian Sea at Narvik, Norway.
 * Saphir (🇳🇴 Norway): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers. The wreck was raised in May 1958 and scrapped.
 * SS Stråssa (1921) (🇸🇪 Sweden): World War II: First Battle of Narvik: The cargo ship was sunk in the Norwegian Sea off Narvik, in a battle between British and German destroyers.
 * MV Sveaborg (🇸🇪 Sweden): World War II: The tanker was torpedoed and sunk in the Atlantic Ocean west of the Faroe Islands (62.86667°N, -7.56667°W) by GS U-37 (1938) with the loss of five of her 34 crew. Survivors were rescued by HMT Northern Chief (.
 * HMS Tarpon (N17) : World War II: The T-class submarine was depth charged and sunk in the Skagerrak by GERMAN AUXILIARY CRUISER Schürbek with the loss of all 59 crew.
 * HMS Thistle (N24) : World War II: Operation Weserübung: The T-class submarine was torpedoed and sunk in the North Sea off Norway by GS U-4 (1935) with the loss of all 59 crew.
 * MV Tosca (1920) (🇳🇴 Norway): World War II: The cargo ship was torpedoed and sunk in the Atlantic Ocean west of the Faroe Islands (62.86667°N, -7.56667°W) by GS U-37 (1938) ( with the loss of two of her 34 crew. Survivors were rescued by HMT Northern Chief.
 * GERMAN PATROL BOAT V-705 : World War II: The vorpostenboot was torpedoed and sunk.
 * GERMAN PATROL BOAT V-1507 : World War II: Operation Weserübung: The vorpostenboot was torpedoed and sunk in the Skagerrak off the Pater Noster Lighthouse by HMS Triton (N15).
 * SS Wigbert (1921) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the Skagerrak off the Pater Noster Lighthouse by HMS Triton (N15).
 * GERMAN DESTROYER Z21 Wilhelm Heidkamp : World War II: First Battle of Narvik: The was torpedoed and sunk in the Norwegian Sea off Narvik, Norway by HMS Hardy (1936).

11 April

 * SS August Leonhardt (1922) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the Skagerrak (56.5°N, 11.5°W) by HMS Sealion (72S).
 * SS Ionia (1922) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the Baltic Sea off Larvik, Norway (58.5°N, 10.58333°W) by HMS Triad (N53).
 * MF Oscarsborg-Narvik (🇳🇴 Norway): World War II: The car ferry was shelled and sunk without loss of life off Narvik, Norway.
 * GERMAN PATROL BOAT Schiff 9 : World War II: The auxiliary patrol boat (requisitioned trawler Koblenz) struck a mine off Bergen, Norway and sank.
 * GERMAN PATROL BOAT Vp-105 : World War II: The auxiliary patrol boat (requisitioned trawler Cremon) struck a mine and sank off Bergen, Norway.

12 April

 * Chasseur 107 : The submarine chaser collided with SS Shelspra (🇫🇷 France) in the Loire and sank.
 * HNOMS Michael Sars : World War II: The disarmed offshore patrol vessel was bombed and damaged by British Fairey Swordfish aircraft from HMS Furious (47) in Narvik harbour. She sank the next day. Later raised and pressed into Kriegsmarine service.
 * MV Moonsund (1937) : World War II: The naval tanker was intercepted in the Skagerrak off Larvik, Norway by HMS Snapper (39S) and was shelled and sunk.
 * SS Stancliffe (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the North Sea north east of the Shetland Islands by GS U-37 (1938) with the loss of 22 of her 38 crew.
 * HNOMS Senja (1937) : World War II: The captured Norwegian offshore patrol vessel, manned by a prize crew from GERMAN DESTROYER Z17 Diether von Roeder, was bombed and sunk by British Fairey Swordfish aircraft from HMS Furious (47) in Narvik harbour. Later raised and pressed into Kriegsmarine service.
 * HNOMS Storm (1898) : The torpedo boat ran aground at Stangholmene, Norway. She was beached, and sank the next day.
 * MV Velocitas (🇳🇱 Netherlands): World War II: The coaster struck a mine and sank in the North Sea east of Margate, Kent, United Kingdom (51.41667°N, 1.83333°W) with the loss of three of her five crew. The survivors were rescued by SS Mavis (1930) (🇬🇧 United Kingdom).

13 April

 * GERMAN DESTROYER Z11 Bernd von Arnim : World War II: Second Battle of Narvik: The was scuttled in the Norwegian Sea off Narvik, Norway.
 * SS Cate B (🇳🇴 Norway): World War II: The cargo ship was torpedoed sunk in the Norwegian Sea off Narvik in a battle between British and German warships. She was hit by a torpedo from a Royal Navy ship and one from GERMAN DESTROYER Z18 Hans Lüdemann . She was salvaged and scrapped in 1955.
 * GERMAN DESTROYER Z17 Diether von Roeder : World War II: Second Battle of Narvik: The was sunk in the Norwegian Sea off Narvik by HMS Warspite (03)  and other Royal Navy destroyers.
 * GERMAN DESTROYER Z12 Erich Giese : World War II: Second Battle of Narvik: The was sunk in the Norwegian Sea off Narvik by HMS Warspite (03)  and other Royal Navy destroyers.
 * GERMAN DESTROYER Z13 Erich Koellner : World War II: Second Battle of Narvik: The was shelled and damaged in the Norwegian Sea off Narvik by HMS Warspite (03)  and other Royal Navy destroyers. She was subsequently scuttled. Thirty-one of her 186 crew were killed.
 * HNOMS Frøya : World War II: Norwegian Campaign: The minelayer was scuttled in Trondheimsfjord, then torpedoed and destroyed by GS U-34 (1936)
 * Gazelle (🇩🇪 Germany): World War II: The trawler was sunk by enemy action.
 * GERMAN DESTROYER Z2 Georg Thiele : World War II: Second Battle of Narvik: The was scuttled in the Norwegian Sea off Narvik.
 * GERMAN DESTROYER Z18 Hans Lüdemann : World War II: Second Battle of Narvik: The was scuttled in the Norwegian Sea off Narvik.
 * GERMAN DESTROYER Z19 Hermann Künne : World War II: Second Battle of Narvik: The was sunk in the Norwegian Sea off Narvik by HMS Eskimo (F75).
 * GERMAN TANKER Jan Wellem : World War II: The Fleet tanker was sunk in the Norwegian Sea off Narvik in a battle between British and German warships.
 * HNOMS Kelt : World War II: The disarmed patrol boat was bombed and sunk by British Fairey Swordfish aircraft from HMS Furious (47) in Narvik harbour.
 * GERMAN MINESWEEPER M-1108 : World War II: The minesweeper was sunk in a collision the Great Belt, south-west of Omø, Denmark. (55.08333°N, 11.06667°W)
 * SS Öxelösund (🇸🇪 Sweden): World War II: The cargo ship was sunk in the Norwegian Sea off Narvik in a battle between British and German warships.
 * MV Rødskjæl (1914) (🇳🇴 Norway): World War II: The tanker was sunk in the Norwegian Sea off Narvik in a battle between British and German warships.
 * Styrbjörn (🇸🇪 Sweden): World War II: The tug was sunk in the Norwegian Sea off Narvik in a battle between British and German warships.
 * SS Torne (🇸🇪 Sweden): World War II: The cargo ship was sunk in the Norwegian Sea off Narvik in a battle between British and German warships.
 * GS U-64 (1939) : World War II: Second Battle of Narvik: The Type IXB submarine was bombed and sunk in the Herjangsfjord off Bjerkvik, Norway, by a Fairey Swordfish aircraft from HMS Warspite (03) with the loss of eight of her 46 crew.
 * GERMAN DESTROYER Z9 Wolfgang Zenker : World War II: Second Battle of Narvik: The was scuttled in the Norwegian Sea off Narvik.

14 April

 * SS Bärenfels (1921) : World War II: The supply ship was bombed and sunk at Bergen, Norway by Blackburn Skua aircraft of 800 and 803 Naval Air Squadrons, Fleet Air Arm.
 * GERMAN TRAINING SHIP Brummer : World War II: Operation Weserübung: The auxiliary gunnery training ship was torpedoed and severely damaged in the Kattegat by HMS Sterlet (2S) . She capsized and sank the next day.
 * SS Disperser (🇬🇧 United Kingdom): The cargo ship sank in the North Sea off Kirkwall, Orkney Islands.
 * MV Florida (1939) : World War II: Operation Weserübung: The troopship was torpedoed and sunk in the North Sea off Orust, Sweden (57.98333°N, 10.85°W) by HMS Snapper (39S).
 * GERMAN MINESWEEPER M-1101 : World War II: The minesweeper struck a mine laid by HMS Narwhal (N45) in Kattegat. She was beached in the Oslofjord the next day.
 * MV Nyborg (🇩🇰 Denmark): World War II: The ferry struck a mine and sank in the Kattegat off Sprogø.
 * SS Oldenburg (1936) : World War II: The U-boat support ship was torpedoed and sunk in the Skagerrak (57.83333°N, 11.25°W) by HMS Sunfish (81S).
 * MV Ölschiff 3 : World War II: The tanker was intercepted in the Arctic Ocean north west of Vågsøy, Norway and was scuttled by her crew.
 * MV Skagerrak (1928) : World War II: The naval tanker was intercepted in the Norwegian Sea north west of Vågsøy (64.08333°N, 2°W) by HMS Suffolk (55) and was scuttled.
 * HNOMS Teist (1907) : World War II: The was scuttled in the Skagerrak off Herad to prevent capture by German forces.

15 April

 * HNOMS A-3 : World War II: The A-class submarine was scuttled at Tønsberg.
 * HNOMS A-4 : World War II: The A-class submarine was scuttled at Tønsberg.
 * SS Bernisse (🇳🇱 Netherlands): World War II: The cargo ship was captured by the Kriegsmarine in the Norwegian Sea off Narvik, Norway and scuttled.
 * GERMAN MINESWEEPER Carsten Janssen : World War II: The minesweeper was torpedoed and sunk in the Kattegat (57.91667°N, 10.88333°W) by HMS Snapper (39S).
 * GERMAN MINESWEEPER H M Behrens : World War II: The minesweeper was torpedoed and sunk in the Kattegat (57.91667°N, 10.88333°W) by HMS Snapper (39S).
 * SS Mersington Court (1920) (🇬🇧 United Kingdom): World War II: The cargo ship was captured in the Norwegian Sea off Narvik by German forces and was scuttled.
 * SS North Cornwall (🇬🇧 United Kingdom): World War II: The cargo ship was captured in the Norwegian Sea off Narvik by German forces and was scuttled.
 * GS U-49 (1939) : World War II: The Type VIIB submarine was depth charged and sunk in the Norwegian Sea off Harstad, Norway by HMS Brazen (H80) and HMS Fearless (H67) (both ) with the loss of one of her 42 crew.
 * GERMAN AUXILIARY PATROL BOAT Vp-811 : The vorpostenboot sank in the North Sea. She was later salvaged, repaired and returned to service.

16 April

 * SS Favorit (1919) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in the Atlantic Ocean (60.1°N, -8.53333°W) by Luftwaffe aircraft. All 23 crew were rescued by the trawler Commander Horton (🇬🇧 United Kingdom) and HMS Lincoln (G42).
 * SS Mertainen (🇸🇪 Sweden): World War II: The cargo ship was bombed and sunk in the Trondheimsfjord, Norway by Luftwaffe aircraft.
 * GS U-1 (1935) : World War II: The Type IIA submarine struck a mine and sank in the North Sea with the loss of all 24 crew.
 * GERMAN PATROL BOAT V-1703 : World War II: The vorpostenboot was torpedoed and sunk by HMS Narwhal (N45) . She was later repaired and returned to service.

17 April

 * MV Juanita (🇬🇧 United Kingdom): World War II: The tanker was scuttled as a blockship at Scapa Flow, Orkney Islands.
 * SS Swainby (1917) (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the North Sea 25 nmi north east of Muckle Flugga, Shetland Islands (61.05°N, -0.23333°W) by GS U-13 (1935) . All 38 crew were rescued.

18 April

 * HNOMS Grib (1905) : World War II: The was scuttled south of Lyngør, Norway, to prevent capture by German forces.
 * SS Hamm (1925) : World War II: The troopship was torpedoed and damaged in the Skagerrak south east of Skagen, Denmark (58.15°N, 10.53333°W) by HMS Seawolf (47S) . She sank in the early hours of the next day.
 * HNOMS Jo (1905) : World War II: The was run aground and scuttled south of Lyngør to prevent capture by German forces.
 * HNOMS Ravn (1903) : World War II: The was scuttled south of Lyngør to prevent capture by German forces.
 * HNOMS Sæl : World War II: The Norwegian Campaign: The  was sunk in Hardangerfjord during a battle with three E-boats.
 * HMS Sterlet (2S) : World War II: The S-class submarine was sunk in the Skagerrak south of Larvik, Norway.

19 April

 * SS Jaunjelgava (🇱🇻 Latvia): The cargo ship collided with another ship in the Baltic Sea and sank.

20 April

 * SS Hawnby (1936) (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea off the north coast of Kent (51.53333°N, 1.21667°W). All 39 crew were rescued by MTB-4.
 * SS Mersey (1906) (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in The Downs, Kent (51.28333°N, 1.46667°W) with the loss of fourteen of her 21 crew.
 * HMS Rutlandshire : World War II: The ASW trawler was bombed and sunk in the Namsenfjorden off Namsos, Norway by Luftwaffe aircraft.
 * HNOMS Smart : World War II: The auxiliary patrol vessel was shelled and sunk at Uskedal by GERMAN TRAINING SHIP Bremse.
 * HNOMS Stegg (1921) : World War II: Norwegian Campaign: The was sunk in Hardangerfjord  by GERMAN PATROL BOAT Schiff 221.

21 April

 * MV Cedarbank (🇬🇧 United Kingdom): World War II: Convoy AP 1: The cargo ship was torpedoed and sunk in the Norwegian Sea off Norway (62.81667°N, 4.16667°W by GS U-26 (1936) with the loss of fifteen of her 45 crew. Survivors were rescued by HMS Javelin (F61).
 * Hercules II (🇬🇧 United Kingdom): World War II: The trawler was bombed and sunk in the North Sea by Luftwaffe aircraft.
 * SS Jurgen Fritzen (🇩🇪 Germany): The cargo ship ran aground and sunk in the Kattegat off Landsort, Sweden.
 * Penn (🇬🇧 United Kingdom): World War II: The trawler was bombed and sunk in the North Sea by Luftwaffe aircraft.

22 April

 * Bep (🇳🇱 Netherlands): World War II: The fishing vessel was sunk in the North Sea of Terschelling, Friesland by an E boat. The crew were rescued.
 * SS Bravore (1915) (🇳🇴 Norway): World War II: The cargo ship struck a mine and sank in the North Sea off Ramsgate, Kent, United Kingdom with the loss of eighteen of the 24 people on board.
 * SS Delamore (🇳🇴 Norway): The coaster struck a rock and sank at Marsteinen. Salvage attempts were unsuccessful.
 * SS Sigurd Jarl (1894) (🇳🇴 Norway): World War II: The cargo ship was bombed and set on fire in Moldefjord by Luftwaffe aircraft. She sank the next day. Raised in 1942 but not repaired, sold for scrapping in 1947.
 * Wocana (🇳🇱 Netherlands): World War II: The skoot was intercepted by, and collided with, HMS Pintail (L21) in the North Sea off Great Yarmouth, Norfolk and sank.

23 April

 * SS Daghestan (🇬🇧 United Kingdom): World War II: The CAM ship/tanker was torpedoed and sunk in the North Sea east of the Orkney Islands by GS U-57 (1938) ( with the loss of three crew.
 * SS Lolworth (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea east of Ramsgate, Kent (51.36667°N, 1.43333°W) with the loss of two of her 24 crew.
 * SS Sayn (1898) ( Nazi Germany): World War II: The cargo ship struck a mine and sank in the Wadden Sea off Borkum, Lower Saxony.
 * GERMAN MINESWEEPER Schwaben : World War II: The minesweeper struck a mine in the Kattegat and sank.
 * GERMAN AUXILIARY SUBMARINE HUNTER UJ B : World War II: The auxiliary submarine hunter was torpedoed and sunk in the Skagerrak (58.35°N, 10.4°W) by HMS Tetrarch (N77) . There were only three survivors.

24 April

 * SS Cronshagen (1904) (🇩🇪 Germany): World War II: The cargo ship struck a mine off Copenhagen, Denmark and sank.
 * SS Girasol (🇬🇧 United Kingdom): The cargo ship collided with SS Contractor (🇬🇧 United Kingdom) in the North Sea north of Margate, Kent and sank. All eleven crew were rescued by ST Richard (🇧🇪 Belgium.
 * SS Haxby (🇬🇧 United Kingdom): World War II: The cargo ship was torpedoed and sunk in the Caribbean Sea north east of the Dominican Republic (31.5°N, -51.5°W) by GERMAN AUXILIARY CRUISER Orion with the loss of 17 of her 40 crew.
 * SS Riverton (1928) (🇩🇪 Germany): World War II: The cargo ship was shelled and sunk in the Norwegian Sea at Narvik, Norway by HMS Effingham (D98).
 * SS Rydal Force (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the North Sea off Ramsgate, Kent with the loss of eleven of her thirteen crew. The survivors were rescued by HMT Sarah Hide.
 * SS Stokesley (🇬🇧 United Kingdom): World War II: The cargo ship struck a mine and sank in the Thames Estuary north of Birchington, Kent (51.53333°N, 1.26667°W) with the loss off fifteen crew.

25 April

 * SS Afrika (1920) (🇩🇪 Germany): World War II: The cargo ship, which had been captured by the torpedo boat HNOMS Stegg (1921) on 9 April, was scuttled in Hardangerfjord off Ulvik, Norway during a German attempt at recapture.
 * SS Bobby (1905) (🇵🇦 Panama): The cargo ship collided with SS Midsland (🇳🇱 Netherlands) in the English Channel, 3 nmi south east of Dungeness, Kent, United Kingdom and sank. All 28 crew were rescued by Midsland.
 * HMT Bradman : World War II: The naval trawler was bombed and sunk in the Norwegian Sea off the west coast of Norway by Luftwaffe aircraft.
 * MS Brand IV (🇳🇴 Norway): World War II: The hospital ship was bombed in the Norwegian Sea off Ålesund by Luftwaffe aircraft and ran aground.
 * SS Folden (1905) (🇳🇴 Norway): World War II: The coaster was bombed and damaged off Tonnes, Nordland by Luftwaffe aircraft. She was beached with the loss of at least six of the 21 people on board. Although condemned as a total loss, she was repaired and returned to service in July 1944.
 * SS Haardraade (1922) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk at Leirvik, Hordaland by Royal Air Force aircraft with the loss of one crew member. Later raised, repaired and returned to service as Hodnaberg.
 * HMT Hammond : World War II: The naval trawler was bombed and sunk in the Norwegian Sea off the west coast of Norway by Luftwaffe aircraft. She was salvaged by the Germans in 1942, repaired and entered Kriegsmarine service as Salier in 1945.
 * HMT Larwood : World War II: The naval trawler was bombed and sunk in Fannefjord off Molde, Norway by Luftwaffe aircraft. She was salvaged by the Germans in 1940, repaired and entered Kriegsmarine service as Franke.
 * SS Margham Abbey (🇬🇧 United Kingdom): World War II: Convoy FS 53: The cargo ship struck a mine and sank in the Thames Estuary north of Herne Bay, Kent. All crew were rescued.
 * MV San Miguel (1920) (🇳🇴 Norway): World War II: The cargo ship was scuttled off Ulvik in the Hardangerfjord by Norwegian troops during a German attempt at capture. Later raised, repaired and returned to service
 * GERMAN AUXILIARY Schiff 18 : World War II: The armed auxiliary was severely damaged at Kinsarvik by Norwegian troops firing machine guns and a lorry-mounted naval gun, and forced to beach at Utne, Norway.
 * HNOMS Trygg (1919) : World War II: Battle of Åndalsnes: The was bombed and sunk in the Romsdalsfjord off Åndalsnes by Luftwaffe aircraft. She was salvaged by the Germans, repaired and entered Kriegsmarine service as Zick.
 * Willy (🇳🇱 Netherlands): World War II: The fishing vessel struck a mine and sank in the North Sea off Terschelling, Friesland with the loss of all hands.

26 April

 * HNOMS Garm (1913) : World War II: The was bombed and sunk in Sognefjord by Luftwaffe aircraft.
 * SS Lily (1920) (🇩🇰 Denmark): World War II: The cargo ship was torpedoed and sunk in the North Sea off Kinlochbervie, Sutherland, United Kingdom by GS U-13 (1935) with the loss of 24 crew.
 * GERMAN PATROL BOAT Schiff 37 : World War II: The auxiliary patrol boat (requisitioned trawler Schleswig) was shelled and sunk west of Ålesund, Norway. (62.61667°N, 4°W)

27 April

 * HMT Athelstan (GY-648) (🇬🇧 United Kingdom): The trawler was last seen by Claire at 54°N, 1.91667°W. No further trace, lost with all nine crew.
 * SS Nyhaug (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk at Lepsøya by Luftwaffe aircraft. She was later raised, repaired and returned to service as Holla.
 * SS Thornhill (🇬🇧 United Kingdom): The coaster collided with SS Circe (🇫🇷 France) in the English Channel off Start Point, Devon and sank with the loss of one crew member.

28 April

 * SS Capella (1885) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in Tingvollfjorden, Møre og Romsdal by Luftwaffe aircraft. Raised in 1943, repaired and returned to service as Hillevaag in July 1943.
 * HMT Cape Siretoko : World War II: The naval trawler was bombed and sunk in the Norwegian Sea off the west coast of Norway by Luftwaffe aircraft. Raised, repaired and put in Kriegsmarine service as Gote V-6113.
 * MV Gallus (1919) (🇳🇴 Norway): World War II: The coaster was bombed and sunk off Kristiansund, Møre og Romsdal by Luftwaffe aircraft. Later raised and returned to service.
 * SS Svanholm (1917) (🇳🇴 Norway): World War II: The coaster was bombed and sunk off the island of Tustna, Møre og Romsdal by Luftwaffe aircraft. Raised in 1940, repaired and returned to service in 1942 as Bergfin.

29 April

 * SS Begonia (1890) (🇪🇪 Estonia): World War II: The cargo ship was bombed and damaged in Aurlandsfjord off Flåm, Norway by Luftwaffe aircraft on 25 April. She was scuttled by the Norwegian military four days after the bombing.
 * HMT Cape Chelyuskin (FY 119) : World War II: The naval trawler was bombed and in the Norwegian Sea sunk off Trondheim, Norway by Luftwaffe aircraft.
 * HMT Jardine (FY 169) : World War II: The naval trawler was bombed and damaged in the Norwegian Sea off Trondheim, Norway by Luftwaffe aircraft. She was judged to be unfit to cross the North Sea and was scuttled by the Royal Navy the next day. She was later salvaged by the Germans and entered service as V-6117.
 * SS Ørland (1917) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in the North Sea off Midsund by Luftwaffe aircraft. All crew survived.
 * HMS Unity (N66) : The U-class submarine collided with SS Atle Jarl (1919) (🇳🇴 Norway) off the mouth of the Tyne (55.21667°N, -1.31667°W) and sank with the loss of two of her 27 crew.
 * SS Whitetoft (🇬🇧 United Kingdom): The cargo ship ran aground at Robin Hood's Bay, Yorkshire and was wrecked.

30 April

 * HMT Aston Villa : World War II: Namsos Campaign: The ASW trawler was bombed and damaged in the Norwegian Sea off Namsos, Norway, by Junkers Ju 87 aircraft of the Luftwaffe. She was scuttled on 3 May.
 * Athelstan (🇬🇧 United Kingdom): World War II: The trawler was bombed and sunk in the North Sea by Luftwaffe aircraft.
 * HMS Bittern (L07) : World War II: Namsos Campaign: The was bombed and damaged in the Norwegian Sea off Namsos by Luftwaffe aircraft. She was subsequently scuttled by HMS Carlisle (D67).
 * RFA Boardale : World War II: The tanker ran aground off Straume, Nordland, Norway (68.71667°N, 14.40833°W). She sank on 2 May.
 * HMS Dunoon (J52) : World War II: The minesweeper struck a mine and sank in the North Sea off Great Yarmouth, Norfolk (52.75°N, 2.38333°W) with the loss of 26 of her 73 crew.
 * HMT Gaul : World War II: The naval trawler was bombed and damaged in the Norwegian Sea off Namsos by Luftwaffe aircraft. She was scuttled on 3 May.
 * GERMAN TORPEDO BOAT Leopard : The 1924 Raubtier-class torpedoboat collided with the minelayer GERMAN MINELAYER Preussen in the Skagerrak and sank.
 * FRENCH DESTROYER Maillé Brézé : The was sunk at Greenock, Renfrewshire, United Kingdom by the accidental explosion of two of its own torpedoes with the loss of 25 of her 220 crew.
 * MV Saturnus (1930) (🇳🇴 Norway): World War II: The cargo ship was bombed and sunk in Todalsfjord by Luftwaffe aircraft. Later raised, repaired and returned to service.
 * HMT St Goran : World War II: Namsos Campaign: The ASW trawler was bombed and severely damaged off Namsos by Luftwaffe aircraft. She was subsequently bombed again and sunk the next day.
 * HMT Warwickshire (FY 113) : World War II: The naval trawler was bombed and sunk in the Norwegian Sea off Trondheim, Norway by Luftwaffe aircraft. She was salvaged by the Germans and entered Kriegsmarine service as Alame.

Unknown date

 * MS Ruhrort (1936) (🇩🇪 Germany): World War II: The cargo ship was captured in the Norwegian Sea off Vemøya, Møre og Romsdal, Norway on 12 April by HNOMS Commonwealth, HNOMS Sleipner (1936), and HNOMS Trygg (1919) (all ). She was later abandoned and thereafter sunk by Luftwaffe aircraft.
 * SS Seminole (🇬🇧 United Kingdom): World War II: Convoy HX 34: The cargo ship struck a mine and was beached. She was later refloated, repaired and returned to service.
 * SS Tugela (1921) (🇳🇴 Norway): World War II: The cargo ship was scuttled at Oslo. She was later raised, repaired and entered German service.