Editing List of naval battles (section)

===[[World War II]] (1939–1945)===
* 1939–1945 [[Battle of the Atlantic (1939–1945)]]
* 1939
** 1 September [[Battle of Danzig Bay|Danzig Bay]] – German Stuka dive bombers destroy much of the Polish Navy
** 1–3 September [[Battle of Hel]] – Surviving Polish warships engage German invasion fleet. All Polish ships are sunk or captured.
** 1–25 September [[Worek Plan]] – Polish submarines attempt to defend coast against German landings.
** 13 December [[Battle of the River Plate|River Plate]] – British and New Zealand cruisers engage the German heavy cruiser [[German cruiser Admiral Graf Spee|''Admiral Graf Spee'']]. Damaged, she is later scuttled.
* 1940
** 8 April [[HMS Glowworm (H92)|Action of 8 April 1940]] – The German cruiser ''[[German cruiser Admiral Hipper|Admiral Hipper]]'' sinks the destroyer {{HMS|Glowworm|H92|6}} off of Norway
** 8 April Sinking of the ''Rio de Janeiro'' – German transport ship [[SS Rio de Janeiro (1914)|SS ''Rio de Janeiro'']] is sunk by the Polish submarine [[ORP Orzel (1938)|ORP ''Orzel'']].
** 9 April [[Battles of Narvik#Naval battle preceding the first naval battle of Narvik|Preceding Battle of Narvik]] – Flotilla of German destroyers engage and sink Norwegian coastal defense ships [[HNoMS Norge|HNoMS ''Norge'']] and [[HNoMS Eidsvold|HNoMS ''Eidsvold'']]
** 9 April [[Battle of Drøbak Sound]] Norwegian coastal defenses at [[Oscarsborg Fortress]] sink the German heavy cruiser [[German cruiser Blücher|''Blücher'']]
** 9 April [[Action off Lofoten]] German battleships ''Scharnhorst'' and ''Gneisenau'' engage British battlecruiser HMS ''Renown'' and her group of destroyers. No ship is lost and only suffers minimal damage, first engagement between capital ships of the war.
** 9 April [[Battle of Horten Harbour]] – [[German cruiser Emden|German cruiser ''Emden'']] and destroyers assault Norwegian naval base in Horten. Norwegian minesweepers attempt to defend the base, but fail.
** 9 April [[Battle of Kristiansand (1940)|Battle of Kristiansand]] – [[German cruiser Karlsruhe|German cruiser ''Karlsruhe'']] and supporting destroyers engage Norway's Odderøya coastal defense fortress. Fortress is later captured by German marines, while the fortress sinks the German transport ship [[MS Seattle|MS ''Seattle'']].
** 9 April [[Capture of Arendal]] – [[German torpedo boat Greif|German torpedo boat ''Greif'']] confronts the Norwegian [[2.-class torpedo boat]], HNoMS ''Jo'' in a bloodless engagement. ''Jo'' and the rest of the Norwegian defenders surrender the Port of Arendal. 
** 10 April [[Battles of Narvik#Second naval Battle of Narvik|First Battle of Narvik]] – British destroyer flotilla sinks two German destroyers and a flotilla of merchant ships
** 13 April [[Battles of Narvik#Second naval Battle of Narvik|Second Battle of Narvik]] – [[HMS Warspite (03)|HMS ''Warspite'']] and a force of supporting destroyers sinks all remaining German destroyers in Narvik.
** 26 May – 4 June [[Dunkirk evacuation]]
** 8 June [[Operation Juno]] – German battleships ''Gneisenau'' and ''Scharnhorst'' sink the aircraft carrier HMS ''Glorious'' and two destroyers off Norway
** 10–25 June [[Italian invasion of France]] – French and Italian naval forces skirmish in the opening hours of the invasion
** 14–15 June [[Convoy HX 47]] – Two German U-boats attack British convoy, sinking two merchant ships.
** 21–22 June [[Convoy HX 49]] – Three German U-boats attack British convoy, sinking three merchant ships.
** 28 June [[Battle of the Espero Convoy]] British cruiser [[HMS Orion (85)|HMS ''Orion'']] sinks Italian destroyer [[Italian destroyer Espero (1927)|''Espero'']]
** 3 July [[Destruction of the French Fleet at Mers-el-Kebir|Mers-el-Kebir]] – British fleet attacks French fleet in harbour in Algeria
** 3–6 July [[Convoy OA 178]] – German Stuka's attack British convoy, sinking several merchant ships and damaging more. 
** 9 July [[Battle of Calabria|Calabria (Punta Stilo)]] – British fleet attacks Italian fleet
** 19 July [[Battle of Cape Spada|Cape Spada]] – [[HMAS Sydney (1934)|HMAS ''Sydney'']] sinks Italian cruiser ''Bartolomeo Colleoni'' off Crete
** 24–27 August [[Convoy HX 65]] – 8 ships sunk in North Atlantic. First Canadian action of the war. 
** 25 August – Sinking of the ''Elli'' – Italian submarine [[Italian submarine Delfino (1930)|''Delfino'']] sinks the Greek cruiser [[Greek cruiser Elli (1912)|RHS ''Elli'']]
** 3–5 September [[Convoy FS 271]] – German E-boats attack British convoy, sinking five merchant ships. 
** 6–9 September [[Convoy SC 2]] – German U-boats attack Allied convoy, sinking three merchant ships.
** 20–22 September [[Convoy HX 72]] – 11 ships sunk in the North Atlantic.
** September 23–35 [[Battle of Dakar|Dakar]] – Vichy French fight off a British/Free French landing at [[Dakar]]
** 12 October [[Battle of Cape Passero (1940)|Battle of Cape Passero]] – British cruisers HMS ''Ajax'' and HMS ''York'' engage and sink three Italian destroyers.
** 16–19 October [[Convoy SC 7]] – 20 ships sunk in North Atlantic
** 19–20 October [[Convoy HX 79]] – 12 ships sunk in North Atlantic
** 20–21 October [[Attack on Convoy BN 7]] – Allied fleet engages a flotilla of Italian destroyers, sinking one of them
**5 November [[Convoy HX 84]] – 5 ships sunk in North Atlantic
** 9 November [[Battle of Gabon]] – Free French aviso [[French aviso Savorgnan de Brazza|''Savorgnan de Brazza'']] sinks Vichy French aviso [[French aviso Bougainville|''Bougainville'']] 
** 11 November [[Battle of Taranto|Taranto]] – British air attack on Italians anchored at Taranto, inspiring the Japanese attack on Pearl Harbor
** 12 November [[Battle of the Strait of Otranto (1940)|Strait of Otranto]] – British and Australian ships engage and destroy an Italian convoy.
** 27 November [[Battle of Cape Spartivento|Cape Spartivento (Cape Teulada)]] – British fight back an Italian interception
** 30 November – 27 December [[Operation Nordseetour]] – German cruiser ''Admiral Hipper'' carry's out raids in the North Atlantic, sinking a merchant vessel and damaging two British cruisers. 
** 1–3 December [[Convoy HX 90]] – 11 ships sunk in North Atlantic
** 6–8 December and 27 December [[German attacks on Nauru]] – German merchant raiders destroy Allied merchant ships off Nauru.
* 1941
** 10–11 January [[Operation Excess]] – Royal Navy engages maritime strike Luftwaffe
** 12 January-2 February [[Convoy SC 19]] – German U-boats intercept Allied convoy, sink four merchant ships.
** 17 January [[Battle of Ko Chang|Ko Chang]] – Vichy France defeats Thailand
** 22 January – 22 March [[Operation Berlin (Atlantic)|Operation Berlin]] – ''Scharnhorst'' and ''Gneisenau'' sink and capture 22 British merchant ships.
** 22 January-8 February [[Convoy SC 20]] – German U-boats intercept Allied convoy, sink five merchant ships.
** 30 January-18 February [[Convoy HX 106]] – German U-boats attack British convoy, sinking two merchant ships.
** 31 January [[Attack on Convoy AN 14]] – Italian destroyers intercept an Allied convoy, disabling a merchant ship
** 8–11 February [[Convoy HG 53]] – 9 ships sunk and 1 German [[Fw 200 Condor]] shot down
** 25–28 February [[Operation Abstention]] – British attempt to land on the Italian-occupied Greek island of [[Kastelorizo]], but are repelled by Italian naval and air forces
** 27 February [[Action of 27 February 1941]] – New Zealand cruiser [[HMNZS Leander|HMNZS ''Leander'']] sinks Italian merchant raider [[Italian auxiliary cruiser Ramb I|''Ramb I'']]
** 2–8 March [[Convoy OB 293]] – 3 ships and 2 U-boats sunk in North Atlantic
** 4 March [[Operation Claymore]] – British destroyers and commandos raid a fish oil plant in occupied-Norway, sinking several German merchant ships
** 15–17 March [[Convoy HX 112]] – German U-boats attack Allied convoy, Allies suffer minimal losses and sink two U-boats.
** 26 March [[Raid on Souda Bay]] – Italian destroyers launch explosive motor boats which sink British cruiser HMS ''York'' and Norwegian tanker ''Pericles''
** 28 March [[Battle of Cape Matapan|Cape Matapan]] – British fleet defeats Italian fleet in night action
** 2–5 April [[Convoy SC 26]] – 10 ships sunk and 1 U-boat destroyed in North Atlantic
** 4 April – [[Action of 4 April 1941]] – German merchant raider [[German auxiliary cruiser Thor|''Thor'']] engages and sinks British merchant raider HMS ''Voltair'' off Cape Verde
** 6 April – Action of 6 April 1941 – British cruiser [[HMS Capetown (D88)|HMS ''Capetown'']] is torpedoed by Italian MAS boat ''MAS-213'', damaging her.
** 16 April – [[Battle of the Tarigo Convoy]] ''Duisburg''. ''Lampo'', ''Tarigo'' and'' Baleno'' are sunk, as well as [[HMS Mohawk (F31)|HMS ''Mohawk'']]
** 7–10 May [[Convoy OB 318]] – 7 ships sunk and 1 U-boat captured in North Atlantic
** 8 May – [[Action of 8 May 1941]] – British cruiser [[HMS Cornwall (56)|HMS ''Cornwall'']] engages and sinks the German merchant raider [[German auxiliary cruiser Pinguin|''Pinguin'']]
** 10–28 May [[Convoy HX 126]] – Nine German U-boats attack British convoy and sink nine merchant ships. 
** 21 May – 1 June – [[Battle of Crete]] – Royal Navy loses three cruisers and 6 destroyers to Axis air attacks
** 24 May – [[Battle of the Denmark Strait]] – ''Bismarck'' and ''Prinz Eugen'' sink HMS ''Hood''
** 24–27 May – [[Bismarck Chase|Hunt for the German battleship ''Bismarck'']] ends in her sinking
** 9 June [[Battle of the Litani River]] – Two Vichy French destroyers engage Australian amphibious forces, chased away by Allied ships
** 16 June-3 July [[Convoy HX 133]] – German U-boats attack Allied convoy, sinking six merchant ships.
** 18 June-12 July [[Convoy SL 78]] – Four German U-boats sink eight Allied merchant ships.
** 22 June-3 August [[Gulf of Riga campaign]] – Series of light engagements between German and Soviet ships, results in German control of the Gulf of Riga
** 22 June 1941 – 27 December 1942 [[Soviet Navy surface raids on Western Black Sea|Western Black Sea raids]] – Series of raids conducted by the Soviet Navy along Romanian and Bulgarian coasts, fails to disrupt Axis shipping
** 26 June [[Raid on Constanța]] – Soviet Black Sea Fleet attempts raid on Romanian port, attack is successfully repelled by Romanian destroyers
** 26 June [[Action of 26 June 1941]] – Romanian torpedo boats engage Soviet gunboats, damaging and capture one
** 9 July [[Action of 9 July 1941]] – Three Romanian torpedo boats engage and sink a Soviet submarine
** 13–14 July [[Operation München]] – Romanian monitor [[NMS Mihail Kogălniceanu|NMS ''Mihail Kogălniceanu'']] engages two Soviet monitors and forces their retreat
** 13–28 July [[Operation Substance]] – [[Force H]] is attacked by Italian torpedo boats, submarines, and aircraft en route to Malta
** 19 July-1 August [[Convoy OG 69]] – German and Italian submarines inflict heavy casualties on British convoy.
** 26 July [[Battle of Bengtskär]] – Soviet Naval Infantry attempt to capture the island of Bengtskär, landings are repelled by Finnish gunboats who sink a Soviet patrol boat
** 10–15 August [[Convoy HG 70]] – British convoy defends itself from German and Italian submarines with minimal losses.
** 13–25 August [[Convoy OG 71]] – 10 ships sunk in North Atlantic
** 25 August [[Anglo-Soviet invasion of Iran|Battle of Khuzestan]] – British and Australian sloops engage and sink Iranian sloops IIS ''Babr'' and IIS ''Palang''
** 27 August – [[HMS Graph|Capture of ''U-570'']] – British and Canadian destroyers capture German U-boat ''U-570''
** 27–31 August – [[Soviet evacuation of Tallinn]]
** 9–11 September [[Convoy SC 42]] – 14 ships and 2 U-boats sunk in North Atlantic
** 17 September – 1 October [[Convoy HG 73]] – 9 ships sunk in North Atlantic
** 27 September [[Operation Halberd]] – Royal Navy successfully defends convoy from Italian fleet and air attacks
** 14–18 October [[Convoy SC 48]] – 11 ships sunk in North Atlantic
** 22 October-5 November [[Convoy HX 156]] – Allied convoy successfully defends against U-boat attacks.
** 30 October – 4 July 1941 [[Siege of Sevastopol (1941–1942)|Siege of Sevastopol]] – Soviet Black Sea Fleet attempts to defend Sevastopol from Axis small craft and aircraft, ultimately fails
** 6 November – [[Crimean campaign]] – Romanian submarine [[NMS Delfinul|NMS ''Delfinul'']] sinks the Soviet cargo ship SS ''Uralets''
** 8–9 November [[Battle of the Duisburg Convoy]] – Royal Navy intercepts and destroys an Italian convoy
** 19 November – [[Sinking of HMAS Sydney|HMAS ''Sydney'' and the German surface raider ''Kormoran'']] destroy each other in a single ship action off Western Australia; ''Sydney'' is lost with all hands
** 6 December [[Action of 6 December 1941]] – Bulgarian submarine chasers, ''Chernomorets'' and ''Belomorets'' engage and sink the Soviet submarine ''Shch-204''
** 7 December '''[[Attack on Pearl Harbor|Pearl Harbor]]''', also starting the [[Pacific War]] – Japanese naval and air forces launch surprise raid on American naval base at Pearl Harbor, forces United States to enter World War II
** 8–23 December [[Battle of Wake Island]] – American coastal and air defenses at Wake Island hold off Japanese invasion for 15 days, sinking several Japanese warships in the process
** 8–25 December [[Battle of Hong Kong]] – British destroyers and gunboats are engaged by Japanese gunboats and aircraft
** 10 December South China Sea – [[HMS Prince of Wales (53)|HMS ''Prince of Wales'']] and [[HMS Repulse (1916)|HMS ''Repulse'']] [[Sinking of Prince of Wales and Repulse|sunk by Japanese air attack]]
** 13 December [[Battle of Cape Bon (1941)|Cape Bon]] – British and Dutch destroyers sink Italian cruisers
** 17 December [[First Battle of Sirte|First Sirte]] – Indecisive British-Italian fight off Libya
** 17 December [[Battle of Jibrieni]] – Soviets attack an Axis convoy, losing a submarine
** 19 December [[Raid on Alexandria (1941)|Raid on Alexandria]] – Italian frogmen cripple several British warships in Alexandria Harbor
** 19–23 December [[Convoy HG 76]] – 4 ships sunk and 5 U-boats destroyed
** 24–25 December [[Battle of Borneo (1941–1942)|Battle of Borneo]] – Dutch submarines engage several Japanese warships and transports during the opening days of the invasion
* 1942
** 12 January [[HNLMS Prins van Oranje|Action of 12 January 1942]] – Dutch minelayer, HNLMS ''Prins van Oranje'' is intercepted and sunk by the Japanese destroyer [[Japanese destroyer Yamakaze|''Yamakaze'']].
** 14 January [[Operation Postmaster]] – British commando unit aboard an armed trawler board and capture the three Axis merchant ships in the neutral Spanish Guinea port of Santa Isabel. 
** 23–25 January [[Battle of Balikpapan (1942)|Battle of Balikpapan]] – American and Dutch destroyers and submarines intercept and sink several Japanese transports
** 26–27 January [[Battle off Endau]] – Australian destroyer, [[HMAS Vampire (D68)|HMAS ''Vampire'']] is sunk by a Japanese fleet.
** 30 January-3 February [[Battle of Ambon]] – Japanese fleet lands invasion force on [[Ambon Island]]. Japanese minesweeper, ''W-9'' strikes a Dutch mine and is sunk, with two more Japanese minesweepers damaged. [[USS Heron (AM-10)|USS ''Heron'']] is severely damaged by Japanese aircraft, but survives.
** 30 January-15 February [[Convoy SC 67]] – Allied convoy defends itself against U-boat attacks. 
** 1 February [[Marshalls-Gilberts raids]] – American carriers launch airstrikes against Japanese bases
** 4 February [[Battle of Makassar Strait]] – Japanese aircraft launch attack on an American-Dutch fleet
** 11–13 [[Channel Dash]] – Major Kriegsmarine surface units escape from occupied-France to Germany, British attempt to intercept with disastrous results
** 13 February [[Battle of Palembang]] – British gunboat [[HMS Li Wo|HMS ''Li Wo'']] intercepts a Japanese convoy and engages it alone, she sinks a transport, but is later sunk by overwhelming fire from escort ships
** 16 February [[Attack on Aruba]] – Several German U-boats sink several Allied oil tankers in coordinated attack
** 16 February – 23 March [[Operation Neuland]] – German & Italian submarines carry out unrestricted submarine warfare in the Caribbean Sea.
** 18–20 February [[Battle of Badung Strait]] – Allied fleet engages Japanese fleet, losing a destroyer
** 19 February '''[[Bombing of Darwin]]''' – Japanese carrier task force attacks Australia
** 21–25 February [[Convoy ON 67]] – 8 ships sunk in North Atlantic
** 25–28 February [[Operation Abstention]] – British attempt to land on [[Kastelorizo]], but an Italian destroyer flotilla intercepts the landing fleet. British forced to retreat. 
** 27 February '''[[Battle of the Java Sea|Java Sea]]''' – Japanese invasion convoy escorts destroy ABDA fleet
** 27 February [[USS Langley (CV-1)|Sinking of the ''Langley'']] – Japanese aircraft attack Allied convoy centered around USS ''Langley'', she is severely damaged and forced to be scuttled.
** 28 February – 1 March [[Battle of Sunda Strait]] – Continuation of the Battle of the Java Sea, Japanese force sinks USS ''Houston'' and HMAS ''Perth''
** 1 March [[Second Battle of the Java Sea]] – Continuation of the Battle of the Java Sea, Japanese force sinks HMS ''Exeter'', HMS ''Encounter'', and USS ''Pope''
** 1 March [[USS Alden (DD-211)|Battle of the Bali Strait]] – Continuation of the Battle of the Java Sea, four surviving American destroyers skirmish with the Japanese, but escape to Australia
** 3 March [[USS Perch (SS-176)|Scuttling of USS ''Perch'']] – American submarine USS ''Perch'' is engaged by Japanese destroyers, suffers damaged and it scuttled, crew is later captured.
** 4 March [[HMAS Yarra (U77)|Last Stand of HMAS ''Yarra'']] – Australian sloop HMAS ''Yarra'' escorts a small convoy, but is intercepted by Japanese cruisers, engages them alone and is sunk.
** 6–13 March [[Operation Sportpalast]] – [[German battleship Tirpitz|German battleship ''Tirpitz'']] leads a fleet to intercept an Arctic convoy, but fails to locate it, British counter with aircraft, but also fail in finding the German fleet
** 22 March [[Second Battle of Sirte|Second Sirte]] – Italian fleet obstacles a British convoy to Malta, hit escorts, but failed to sink the cargo ships. Delay of the convoy led to the loss of four freighters by air attack
** 27 March [[Action of 27 March 1942]] – German submarine ''U-123'' sinks American Q-ship, USS ''Atik''.
** 28 March – [[St Nazaire Raid]] – British destroyer, [[HMS Campbelltown (I42)|HMS ''Campbelltown'']] crashes into Normandie dry dock, rending it useless for the rest of the war. 
** 28–29 March [[Convoy PQ 13]] – British cruiser HMS ''Trinidad'' and destroyers defend convoy against attacking German destroyers.
** 31 March – 1 April [[Battle of Christmas Island]] – Japan invades and occupies [[Christmas Island]], [[Japanese cruiser Naka|Japanese cruiser ''Naka'']] is severely damaged by American submarine, [[USS Seawolf (SS-197)|USS ''Seawolf'']]
** 31 March – 10 April '''[[Indian Ocean Raid]]''' – Japanese task force attacks Ceylon
**14 April [[Convoy OG 82]] – 1 U-boat sunk
** 19 April [[Bombardment of Curaçao]] – German U-boat [[German submarine U-130|''U-130'']] attempts to shell Dutch oil refinery on [[Curaçao]]. U-130 is engaged by Dutch shore batteries, but escapes.
** 3–4 May [[Invasion of Tulagi (May 1942)|Invasion of Tulagi]] – [[USS Yorktown (CV-5)|USS ''Yorktown'']] and her battlegroup engage the Japanese invasion fleet, sinking several small warships, but fail to prevent the capture of [[Tulagi]].
** 5 May-6 November [[Battle of Madagascar]] – Allied forces invade Vichy-controlled Madagascar. Allied fleet engages Vichy French and Japanese warships, before securing the island. 
** 6–21 May [[Convoy ON 92]] – German U-boats inflict heavy casualties upon Allied convoy.
** 8 May '''[[Battle of the Coral Sea|Coral Sea]]''' – Japanese invasion convoy turned back by US carrier aircraft. First carrier battle in history.
* 1942–44 German U-Boats campaign in [[Battle of the St. Lawrence|Gulf of St. Lawrence]]
** 22-27 May [[Action of 22 May 1942]] – [[Italian submarine Barbarigo|Italian submarine ''Barbarigo'']] sinks the Brazilian merchant ship, SS ''Comandante Lyra '', causing Brazilian Navy B-25's to give chase for five days, but eludes destruction.
** 31 May-8 June [[Attack on Sydney Harbour]] – Japanese submarines raid Sydney Harbour, and sink [[HMAS Kuttabul (ship)|HMAS ''Kuttabul'']]
** 3–4 June [[Battle of Dutch Harbor]] – Japanese carrier-based aircraft attack US Navy base in Dutch Harbor, Alaska. [[SS Northwestern|SS ''Northwestern'']] is sunk in the attack.
** 4–5 June '''[[Battle of Midway|Midway]]''' – invasion convoy retreats after US sinks four Japanese carriers and one Japanese heavy cruiser
** 6 June [[Action of 6 June 1942]] – [[German auxiliary cruiser Stier|German merchant raider ''Stier'']] sinks American Liberty Ship, SS ''Stanvac Calcutta.''
** 8 June [[Shelling of Newcastle]] – [[Japanese submarine I-21|Japanese submarine ''I-21'']] shells the Australian port of Newcastle, but do no damage. Australian coastal artillery engages, but ''I-21'' escapes.
** 12–15 June [[Operation Vigorous]] – 6 ships sunk from convoy to Malta. The rest of the convoy is driven back
** 14–15 June [[Operation Harpoon (1942)|Operation Harpoon]] – 6 ships sunk from convoy to Malta when the convoy is intercepted by an Italian cruiser squadron
** 14–17 June [[Convoy HG 84]] – German wolfpack attacks British convoy, sinking five merchant ships.
** 2–4 July [[Convoy PQ 17]] – 24 ships sunk from Arctic convoy to Soviet Union
** 5 July [[Action of 5 July 1942]] – American submarine [[USS Growler (SS-215)|USS ''Growler'']] sinks [[Japanese destroyer Arare (1937)|Japanese destroyer ''Arare'']]
** 5-8 July [[Convoy QS-15]] – German submarine ''U-132'' attacks an Allied convoy sinking three merchant ships.
** 8–10 July [[Battle of Someri]] – Finnish and German gunboats engage and sink Soviet gunboats in the Gulf of Finland
** 17–31 July [[Convoy ON 113]] – Wolfpack intercepts Allied convoy, sinking five merchant ships.
** 24 July-8 August [[Convoy ON 115]] – Wolfpack intercepts Allied convoy, sinks three merchant ships and loses one U-boat.
** 3 August [[Attack on the Dureenbee|Attack on the ''Dureenbee'']] – [[Japanese submarine I-175|Japanese submarine ''I-175'']] attacks and damages the Australian fishing trawler ''Dureenbee''
** 3 August [[Action of 3 August 1942]] – British submarine [[HMS Saracen (P247)|HMS ''Saracen'']] sinks German submarine [[German submarine U-335|''U-335'']] off the Faroe Islands.
** 5–10 August [[Convoy SC 94]] – 11 ships and 2 U-boats sunk in North Atlantic
** 8 August [[Battle of Savo Island|Savo Island]] – Japanese sink 4 cruisers escorting Guadalcanal invasion convoy
** 11–15 August [[Operation Pedestal]] – 13 ships sunk from convoy to Malta
** 16–30 August [[Operation Wunderland]] – German fleet successfully raids Soviet shipping in the Kara Sea, sinking several ships.
** 22–25 August [[Convoy ON 122]] – German U-boats inflict casualties on Allied convoy, demonstrated importance of radar. 
** 24 August '''[[Battle of the Eastern Solomons|Eastern Solomons]]''' – Japanese aircraft carrier ''Ryujo'' sunk while attacking Guadalcanal
** 27-28 August [[Convoys SG-6/LN-6]] – Two German submarines sink two Allied merchant ships.
** 2–21 September [[Operation Orator]] – Allies defend [[Convoy PQ 18]] from German attacks. Convoy losses 13 merchant ships, as to Germany's loss of four U-boats, majority of convoy makes it to Arkhangelsk. 
** 4 September – 2 November [[Battle of Bell Island]] – Two German submarines sink four Canadian ore ships off Newfoundland with heavy casualties. 
** 6-10 September [[Convoy QS-33]] – Two German submarines sink four Allied merchant ships and one Canadian armed yacht. 
** 10–14 September [[Convoy ON 127]] – 7 ships sunk in North Atlantic
** 12–16 September [[Convoy TAG 5]] – 2 ships sunk in Caribbean Sea
** 12-16 September [[Convoy SQ-36]] – Two German submarines sink three Allied merchant ships.
**12-24 September [[Laconia incident|''Laconia'' Incident]] – German U-boat [[German submarine U-156|''U-156'']] torpedoes and sinks British transport [[RMS Laconia (1921)|RMS ''Laconia'']]. Axis submarines and warships attempt to rescue survivors before being attacked by American aircraft, and forced to call off rescue efforts.
** 12–28 September [[Convoy SC 100]] – German U-boats attack Allied convoy, sinking five merchant ships.
** 13–14 September [[Operation Agreement]] – British forces attempt to land in [[Tobruk]], German and Italian torpedo boats and coastal defenses repel invasion, sinking several British warships.
** 13–26 September [[Convoy QP 14]] – German U-boats sink five allied ships of the convoy, while Allies sink one U-boat and damage five. 
** 27 September [[Action of 27 September 1942]] – [[German auxiliary cruiser Stier|German merchant raider ''Stier'']] engages American Liberty ship [[SS Stephen Hopkins|SS ''Stephen Hopkins'']]. Both ships sink each other in the engagement.  
** 1 October [[Battle of Cape Burnas]] – Romanian gunboats engage and sink Soviet submarine after it sank a German transport.
** 12 October [[Battle of Cape Esperance|Cape Esperance]] US cruisers intercept Japanese cruiser force approaching Guadalcanal
** 12–16 October [[Convoy SC 104]] – 8 ships and 2 U-boats sunk in North Atlantic
** 22 October [[Battle of Sukho Island]] – Germany attempts amphibious invasion of Sukho Island, but are repelled by Soviet gunboats, which sink several German transports.
** 26 October '''[[Battle of the Santa Cruz Islands|Santa Cruz Islands]]''' – USS ''Hornet'' sunk in aircraft carrier battle near Guadalcanal
** 26–29 October [[Convoy HX 212]] – 6 ships sunk in North Atlantic
** 27–31 October [[Convoy SL 125]] – 11 ships sunk decoying U-boats away from [[Operation Torch]]
** 1–4 November [[Convoy SC 107]] – 15 ships and 1 U-boat sunk in North Atlantic
** 2–8 November [[Convoy TAG 18]] – 6 ships sunk in Caribbean Sea
** 6–11 November [[Convoy TAG 19]] – 2 ships sunk in Caribbean Sea
** 8 November [[Naval Battle of Casablanca|Casablanca]] – French fleet in harbour an shore batteries attempt to defend Moroccan neutrality but are defeated by a US Navy fleet
** 11 November [[MV Ondina|Attack on the ''Ondina'']] – Dutch oil tanker MV ''Ondina'' and Indian corvette, [[HMIS Bengal (J243)|HMIS ''Bengal'']] defend themselves against two Japanese merchant raiders, sinking one of them.
** 12–15 November '''[[Naval Battle of Guadalcanal|Guadalcanal]]''' – decisive US victory, last offensive Japanese operation attempted in the Guadalcanal campaign, 11 transports and 2 battleships sunk. heavy losses on both sides in 2 night surface actions.
** 15–18 November [[Convoy ON 144]] – German U-boats inflict high casualties upon an Allied convoy.
** 30 November [[Battle of Tassafaronga|Tassafaronga]] US cruisers intercept Japanese destroyers resupplying Guadalcanal, but suffer heavy losses from torpedo attack
** 2 December [[Battle of Skerki Bank]] – Allied fleet intercepts Italian convoy and sinks all four transport ships and most of their escorting destroyers.
* December 1942-June 1943 [[Operation Lilliput]] – Royal Australian Navy provides escort to New Guinea convoys, defends them from Japanese air attacks
** 11–31 December [[Convoy ON 153]] – German U-boats intercept Allied convoy, sink three merchant ships.
** 26–30 December [[Convoy ON 154]] – 14 ships and 1 U-boat sunk in North Atlantic
** 30 December 1942 – 3 January 1943 [[Convoy JW 51B]] – British cruisers and destroyers defend convoy against attacking German cruiser-destroyer force. 
** 31 December [[Battle of the Barents Sea|Barents Sea]] – British escorts fight off German surface attack on convoy JW 51B
* 1943
** 3–12 January [[Convoy TM 1]] – 7 ships sunk in North Atlantic
** 14 January-18 February [[Operation Ke]] – Japan withdraws from the Solomon Islands, Allied and Japanese fleets conduct final engagements of the Guadalcanal Campaign.
**19-20 January [[Battle off Zuwarah]] – British destroyers sink Italian minesweeping force
** 23 January – 3 February [[SS Dorchester|Convoy SG-19]] – German submarine ''U-223'' sinks American troopship, SS ''Dorchester'' with a loss of 674 out of 904 of her crew. Greatest American loss of life from a single ship in a convoy. 
**28 January [[Shelling of Port Gregory]] – [[Japanese submarine I-165|Japanese submarine ''I-165'']] shells Australian port of Port Gregory, there are no casualties.
**29 January [[Battle of Rennell Island|Rennell Island]] – USS ''Chicago'' lost
** 4–7 February [[Convoy SC 118]] – 8 ships and 1 U-boat sunk in North Atlantic
** 21–25 February [[Convoy ON 166]] – 11 ships and 2 U-boats sunk in North Atlantic
** 2–4 March [[Battle of the Bismarck Sea|Bismarck Sea]] – aircraft sink 12 ships from a Japanese troop convoy to [[New Guinea]]
** 6 March [[Battle of Blackett Strait]] – an American task force intercepts 2 Japanese destroyers and sinks them both.
** 6–9 March [[Convoy SC 121]] – 7 ships sunk in North Atlantic
** 10–11 March [[Convoy HX 228]] – 5 ships and 2 U-boats sunk in North Atlantic
** 16–19 March [[Convoys HX 229/SC 122]] – 22 ships and 1 U-boat sunk in largest North Atlantic U-boat [[Wolfpack (naval tactic)|wolfpack]] attack
** 25 March-10 April [[Convoy HX 231]] – German U-boats attack Allied convoy, sink six merchant ships.
** 26 March [[Battle of the Komandorski Islands|Komandorski Islands]] – US cruiser force intercepts a Japanese [[Aleutian Islands]] convoy
** 28 March [[Convoy RS 3]] – German U-boats destroy Convoy RS 3. 
** 1–16 April [[Operation I-Go]] – Japanese launch ariel counteroffensive against Allies in the Solomon Islands, sinking a small number of ships.
** 16 April [[Battle of the Cigno Convoy]] – Italian destroyers defend transport against attacking pair of British destroyers
** 30 April-1 May [[Convoy TS 37]] – ''U-515'' attacks a convoy alone and sinks seven Allied merchant ships.
** 3–4 May [[Battle of the Campobasso Convoy]] – British destroyers sink Italian transport and destroyer
** 9–13 May [[Convoy HX 237]] – German U-boats attack Allied convoy, sinking three merchant ships. Allies counter and sink three U-boats.
** 11–13 May [[Convoy SC 129]] – British defend against large U-boat attack, sinking three U-boats and minimal losses to convoy. 
** 14 May [[AHS Centaur|Attack on AHS ''Centaur'']] – [[Japanese submarine I-177|Japanese submarine ''I-177'']] sinks Australian hospital ship AHS ''Centaur'' with a heavy loss of life.
** 15 May [[German submarine U-176|Sinking of U-176]] – Cuban submarine chasers sink ''U-176'' in the Caribbean. 
** 18–20 May [[Convoy SC 130]] – 3 U-boats sunk in North Atlantic
** 29 April – 6 May [[Convoy ONS 5]] – 12 ships and 6 U-boats sunk in last major North Atlantic U-boat [[Wolfpack (naval tactic)|wolfpack]] attack
** 15–20 June [[Convoy GP55]] – Japanese submarine [[Japanese submarine I-174|''I-174'']] intercepts Allied convoy and sinks American transport and damages an LST.
** 6 July [[Battle of Kula Gulf|Kula Gulf]]
** 8–12 July [[Convoy Faith]] – German aircraft attack Allied convoy, sinking two Allied troopships with heavy casualties. 
** 10-12 July [[Battle of Gela (1943)|Battle of Gela]] - Allied Fleet engages Italian coastal batteries during the [[Allied Invasion of Sicily]].
** 12–13 July [[Battle of Kolombangara]] – Japan defeats a US and New Zealand fleet
** 17–18 July [[Operation Scylla]] – Italian cruiser [[Italian cruiser Scipione Africano|''Scipione Africano'']] repels attack by British torpedo boats, sinking one.
* 31 July [[Action of 31 July 1943]] – [[German submarine U-199|German submarine ''U-199'']] is attacked and sunk by US & Brazilian naval aircraft off Rio de Janeiro.
* August 1943-October 1944 [[Kara Sea U-boat campaign]] – German U-boats attempt to disrupt Soviet shipping in the Kara Sea, scoring several kills
** 6–7 August [[Battle of Vella Gulf]] – American destroyers intercept the "[[Tokyo Express]]" and sink 3 Japanese destroyers.
** 17–18 August [[Battle off Horaniu]] – American destroyers intercept Japanese convoy evacuation the Solomon Islands
** 29 August [[Battle of Isefjord]] – Danish coastal defense ship, [[HDMS Niels Juel (1918)|HDMS ''Niels Juel'']] is sunk by German  warships and aircraft while attempting to flee to Sweden.
** 8 September [[Operation Zitronella]] – German task force led by ''Tirpitz'' and ''Scharnhorst'' destroy Norwegian coastal defenses in Svalbard
** 8 September-22 November [[Dodecanese campaign]] – German forces invade and occupy the Italian Dodecanese Islands, Allied and Italian fleets take heavy losses.
** 9 September [[Action off Bastia]] – Italian destroyers and coastal defenses engage a small German auxiliary fleet, sinking all of them. 
** 9 September [[Battle of the Straits of Bonifacio]] – Main Italian fleet attempts to sail to Sardinia following Armistice. German aircraft intercept Italian fleet. [[Italian battleship Roma (1940)|Italian battleship ''Roma'']] is sunk by German aircraft with a [[Fritz X]] radio-controlled bomb. 
** 19–23 September [[Convoys ONS 18/ON 202]] – German U-boats simultaneously attack two convoys, but Allies defend them with minimal losses. 
** 28 September-12 October [[Convoy SC 143]] – German U-boats attack Allied convoy, Allied fleet successfully defends it, sinking three U-boats.
** 6 October – [[Naval Battle of Vella Lavella]]
** 15–18 October [[Convoys ONS 20/ON 206]] – Allied convoys defend themselves against large U-boat attack, with only a single ship lost.
** 22–23 October [[Battle of Sept-Îles]] – German light force defeats similar British force
** 26–29 October Convoy ON 207 – 3 U-boats sunk by a combination of air and naval support in the North Atlantic
** 27–31 October [[Convoy SL 138/MKS 28]] – 1 ship and 1 U-boat destroyed in North Atlantic
** 2 November [[Battle of Empress Augusta Bay|Empress Augusta Bay]]
** 6 November [[Action off Cape Bougaroun]] – German aircraft attack Allied convoy off Algeria, sinking several ships.
** 13 November [[Action of 13 November 1943]] – British submarine [[HMS Taurus (P339)|HMS ''Taurus'']] sinks Japanese submarine ''I-34''
** 18–21 November [[Convoy SL 139/MKS 30]] – 1 ship and 3 U-boats sunk
** 24 November-5 December [[Convoy SL 140/MKS 31]] – Allied convoy defends against attacking U-boats, sinking six of them.
** 26 November [[Battle of Cape St. George]] – American destroyers intercept the "Tokyo Express" and sink 3 Japanese destroyers.
** 13 December [[Action off Silba]] – Three British torpedo boats attack the grounded Croatian cruiser ''Zniam'' and permanently disabling her and sinking a tug.
** 20–30 December [[Convoy JW 55B]] – German battleship ''Scharnhorst'' and escorts sortie to locate Allied convoy. Preludes Battle of the North Cape. 
** 26 December [[Battle of North Cape|North Cape]] – convoy JW 55B escorts sink ''Scharnhorst'' off northern [[Norway]]
** 28 December [[Operation Stonewall]] – Allied ships and aircraft sink three German destroyers in the [[Bay of Biscay]]
* 1944
** 11 January [[Action of 11 January 1944]] – British submarine HMS ''Tally-Ho'' sinks Japanese light cruiser ''Kuma'' off Penang 
** 12-27 January [[Convoy JW 56A]] – German U-boats sink and damage half of the convoy. 
** 14 February [[Action of 14 February 1944]] – British submarine HMS ''Tally-Ho'' sinks German submarine ''UIT-23'' off Penang 
** 17 February [[Operation Hailstone]] – Allied fleet attacks former Japanese naval stronghold at Truk Lagoon in the central Pacific, Japanese defenders lose many aircraft and merchant ships
** 29 February [[Battle of Ist]] – Free French destroyers intercept German convoy and sink a corvette and freighter 
** 1–16 March [[Indian Ocean raid (1944)|Second Indian Ocean Raid]] – Japanese heavy cruiser ''Tone'' sinks British freighter ''Behar''. The crew of ''Behar'' are later executed aboard ''Tone''.
** 29 March [[Action of 29 March 1944]] – Colombian destroyer ARC ''Caldas'' defends convoy against German submarine ''U-154'', and damages her. 
** 19 April – [[Action of 19 April 1944]] – Norwegian submarine [[HNoMS Ula (1943)|HNoMS ''Ula'']] attacks sinks the [[German submarine U-974|German submarine ''U-974'']].
** 22 April-31 May [[Convoy UGS-40]] – German aircraft attack Allied convoy in Mediterranean, but fail to score a single hit. Allies suffer no losses, while Germany loses 19 aircraft.  
** 26 April [[Action of 26 April 1944]] – British light cruiser HMS ''Black Prince'' and escorting destroyers intercept a flotilla of German destroyers, sinking one of them.
** 28 April [[Exercise Tiger|Battle of Lyme Bay]] – German E-boat's raid Lyme Bay and sink two American tank landing ships. 
** 6 May [[Action of 6 May 1944]] – German submarine ''U-66'' is sunk by aircraft from {{USS|Block Island|CVE-21}} and rammed by {{USS|Buckley|DE-51}}
** 13 May [[Action of 13 May 1944]] – Japanese submarine ''RO-501'' is sunk by American destroyer escorts off the Azores.
** 4 June [[German submarine U-505|Capture of ''U-505'']] – German submarine ''U-505'' is captured by {{USS|Guadalcanal|CVE-60}} and her destroyer escorts off Cape Verde.
** 6 June '''[[Invasion of Normandy]]''' – Allied fleets launch the largest amphibious invasion ever conducted in Occupied-France. Allied warships do battle against German coastal defenses and torpedo boats, losing several warships in the invasion.
** 6 June [[German submarine U-744|Capture of ''U-744'']] – British and Canadian warships capture and later scuttle the German submarine ''U-744''
** 9 June [[Battle of Ushant (1944)|Battle of Ushant]] – Allied 10th destroyer flotilla (UK/Canadian/Polish ships) engage and defeat remnants of the German 8th destroyer flotilla off Brittany
** 19 June '''[[Battle of the Philippine Sea|Philippine Sea]]''' – US invasion of Saipan initiates the largest aircraft carrier battle in history including "The Great Marianas Turkey Shoot"
** 19–20 June [[Battle of Nerva Island]] – Soviet gunboats and torpedo boats repel attack by two German destroyer escorts, ''T-30'' and ''T-31''. ''T-31'' is sunk.
** 24 June [[Action off Murter Island]] – Two British torpedo boats engage German and Croatian torpedo boats off Murter Island. Croatian torpedo boat ''T7'' is damaged and beached. 
** 17 July [[Action of 17 July 1944]] – British submarine HMS ''Telemachus'' sinks Japanese submarine ''I-166'' off Penang
** 17 July [[Operation Mascot]] – Royal Navy launches carrier assault against German battleship ''Tirpitz'', but fails.
** 17 July-3 August [[Convoy HX 300]] – Largest convoy of the war, despite German U-boat attacks, Allies successfully defend merchant ships with no losses. 
** 15 August [[Battle of Port Cros]] – American destroyer {{USS|Somers|DD-381}} sinks a German aviso and corvette
** 15 August-14 September [[Operation Dragoon]] – Combined Allied fleet launches amphibious assault in Southern France. Allied warships exchange fire against German coastal artillery.
** 18–19 August [[Convoy Hi-71]] – American submarines sink Japanese convoy and escort carrier ''Taiyo''
** 7 September [[Shin'yo Maru incident|''Shin'yo Maru'' Incident]] – American submarine USS ''Paddle'' attacks Japanese convoy and sinks cargo ship ''Shin'yo Maru'' killing several American POW's
** 23–26 October '''[[Battle of Leyte Gulf|Leyte Gulf]]''' – US invasion of the Philippines produces a decisive battle with the Japanese fleet including four main actions – the [[Sibuyan Sea]], [[Surigao Straits]], off [[Samar (island)|Samar]] and [[Cape Engaño (Luzon)|Cape Engano]]. First use of Kamikaze tactics by the Japanese.
** 6 October [[Action of 6 October 1944]] – Dutch submarine HNLMS ''Zwaardvisch'' sinks German submarine ''U-168'' in the Java Sea
** 12–16 October [[Formosa Air Battle]] – American carrier-based aircraft and Japanese naval aircraft do battle over Formosa
** 23 October [[Battle of Maun Island]] – Yugoslav Partisan Navy gunboats engage two German submarine chasers in a minor skirmish. Yugoslav Partisans retreat after taking damage. 
** 1 November [[Action of 1 November 1944|Battle of Pag Island]] – Two British destroyers ambush and sink a German destroyer and two corvettes
** 9 November-21 December [[Battle of Ormoc Bay]] – American destroyers attack sink several Japanese destroyers and merchant ships
** 10 November [[Action of 10 November 1944]] – American submarine USS ''Flounder'' sinks German submarine ''U-537'' in the Java Sea
** 15–18 November [[Convoy Hi-81]] – American submarines intercept Japanese convoy and sink escort carriers ''Shinyo'' and ''Akitsu Maru''
** 24 December [[SS Léopoldville (1928)|Convoy WEP 3]] – Belgian troopship SS ''Leopoldville'' is torpedoed and sunk by German submarine ''U-486'' with a loss of 819 lives.
* 1945
** 10–20 January [[South China Sea raid]] – American fleet successfully disrupts Japanese shipping in the South China Sea
** 14 March [[German submarine U-174|Sinking of ''U-174'']] – South African frigate [[HMSAS Natal|HMSAS ''Natal'']] sinks ''U-174'' on her maiden voyage.
** 18 March [[Battle of the Ligurian Sea]] – Two British destroyers sink two German destroyer escorts
** 19 March [[Attack on Kure (March 1945)|First Bombing of Kure]] – American carrier-based aircraft damage Japanese warships at anchor in Kure
** 1 April – 25 May '''[[Battle of Okinawa]]''' – The Japanese lose their last significant naval force, including the battleship [[Japanese battleship Yamato|''Yamato'']]. Large scale systematic Kamikaze operations conducted by Japanese air forces.
** 6 April-22 June [[Operation Kikusui]] – Japanese ''Kamikaze'' campaign against Allied warships begins
** 12 April [[German submarine U-1024|Capture of ''U-1024'']] – Two British frigates capture German submarine ''U-1024'' in the Irish Sea
** 12 April-7 May [[Operation Teardrop]] – Allied anti-submarine warfare campaign along the North American East coast.
** 16 April [[Action of 16 April 1945]] – [[Italian Social Republic]] [[MT explosive boat]] hits the [[French destroyer Trombe|French destroyer ''Trombe'']] off [[Liguria]], Italy. She survives, but is damaged beyond repair. 
** 23 April [[Action of 23 April 1945]] – German submarine ''U-183'' is sunk by American submarine USS ''Besugo'' in the Java Sea
** 5–6 May [[Battle of Point Judith]] – American destroyers sink German submarine ''U-853'' in the Long Island Sound.
** 7-8 May [[Actions of 7-8 May 1945]] – Three German U-boats attack and sink three Allied ships. ''U-320'' is sunk in the action, becoming the last U-boat to sunk. Final German naval action of the war. 
** 15–16 May [[Battle of the Malacca Strait]] – British 26th Destroyer Flotilla ambush and sink the Japanese heavy cruiser ''Haguro''.
** 8 June [[Action of 8 June 1945]] – Two British submarines intercept and sink Japanese heavy cruiser ''Ashigara''.
** 18 July [[Attack on Yokosuka]] – Allied naval aircraft bomb and damage Japanese warships in Yokosuka
** 22–23 July [[Battle of Sagami Bay]] – American destroyers intercept Japanese convoy fleeing Tokyo Bay, last surface battle of the war.
** 24 July [[Action of 24 July 1945]] – American destroyer escort USS ''Underhill'' is sunk by Japanese ''kaiten'' (suicide-torpedoes)
** 24–28 July [[Attacks on Kure and the Inland Sea (July 1945)|Second Bombing of Kure]] – Allied naval aircraft sink all remaining Japanese capital ships in Kure
** July–August [[Allied naval bombardments of Japan during World War II|Allied naval bombardments of Japan]] – Allied warships bombard strategic sites on the Japanese coast