| 5 Jan | The allies enter Libya. |
| 22 Jan | The allies captures Tobruk, Libya. |
| 6 Feb | The allies captures Benghazi, Libya. |
| 11 Feb | British forces invades Italian Somaliland. |
| 12 Feb | Erwin Rommel is made commander of the german Afrika Korps. |
| 16 Feb | Bulgaria and Turkey signs non-aggression pact. |
| 16 Feb | 10.000 jews deported from Vienna. |
| 25 Feb | The allies captures Mogadishu, Italian Somaliland. |
| 1 Mar | Bulgaria joins the axis powers. |
| 7 Mar | British troops arrive in Greece. |
| 9 Mar | Italian offensive in Greece. It is halted within a week. |
| 11 Mar | The Lend-Lease act is implemented. |
| 25 Mar | Yugoslavia joins the axis powers. |
| 27 Mar | The pro-german regime in Yugoslavia is toppled. |
| 30 Mar | German troops begin their offensive in North Africa. |
| 3 Apr | The pro-german general Rasch Ali Gailani takes power in Iraq. |
| 4 Apr | German troops captures Benghazi. |
| 4 Apr | The allies capture Addis Abeda. |
| 6 Apr | Germany invades Yugoslavia and Greece. |
| 10 Apr | German troops captures Zagreb. |
| 10 Apr | Croatia (Nezavisna Drzava Hrvatska) is declared independent. |
| 10 Apr | Danish Greenland is placed under US control. |
| 10 Apr | German troops besiege Tobruk. |
| 12 Apr | German troops captures Belgrade. |
| 13 Apr | Soviet and Japan sign non-aggression pact. |
| 17 Apr | Yugoslavia surrenders. |
| 17 Apr | British troops begin leaving the greek mainland. |
| 17 Apr | Croatia declares war on Britain. |
| 22 Apr | German troops captures Thessaloniki, Greece. |
| 24 Apr | The allied troops are evacuated from Greece. |
| 27 Apr | German troops captures Athens. |
| 2 May | British troops begin an offensive against the pro-german regime in Iraq. |
| 10 May | The german deputy Führer Rudolph Hess flies to Scotland on a peace mission. |
| 16 May | The italian forces in east Africa surrenders. |
| 20 May | German airborne assault on Crete. |
| 24 May | The german battleship Bismark is sunk by the British navy. |
| 31 May | The british forces on Crete surrenders. |
| 31 May | British troops troops captures Bagdad. |
| 8 June | The allies invades Vichy controlled Syria and Lebanon. |
| 22 June | Germany invades Soviet Union. |
| 22 June | Italy and Romania declare war on Soviet Union. |
| 25 June | Soviet Union bombs Finland. |
| 26 June | Finland and Hungary declare war on Soviet Union. |
| 28 June | German troops capture Minsk. |
| 29 June | Finland begins offensive against Soviet Union. |
| 15 July | German troops capture Smolensk. |
| 21 July | Germany bombs Moscow. |
| 24 July | Japanese troops occupy French Indo-China. |
| 31 July | Reichsmarshall Hermann Göring orders the SchutzStaffel (SS) to prepare the "total solution of the Jewish question". |
| 16 Aug | German troops capture Novogrod. |
| 25 Aug | British and soviet troops enter Iran. |
| 29 Aug | Finnish troops recapture Viborg. |
| 1 Sep | German jews ordered to wear a yellow star. |
| 5 Sep | German troops capture Estonia. |
| 15 Sep | The german siege of Leningrad begins. |
| 16 Sep | British and soviet troops occupy Iran. |
| 19 Sep | German troops capture Kiev. |
| 28 Sep | The Lend-Lease act is expanded to include the Soviet Union. |
| 1 Oct | Finnish troops capture Petrosadvosk. |
| 16 Oct | Soviet Union moves government to Kuibyshev. |
| 17 Oct | General Hideki Tojo made Prime Minister of Japan. |
| 16 Oct | Romanian troops capture Odessa. |
| 24 Oct | German troops capture Kharkov. |
| 3 Nov | German troops capture Kursk. |
| 14 Nov | British carrier HMS Ark Royal sunk. |
| 22 Nov | German troops capture Rostov. |
| 22 Nov |
Britain orders Finland to cease all offensive operations against Soviet Union within two weeks or face war. |
| 25 Nov | German troops begin attack on Moscow. |
| 5 Dec | German attack on Moscow is abandoned. |
| 6 Dec | Britain and Canada declare war on Finland. |
| 6 Dec | Soviet counter-offensive at Moscow. |
| 7 Dec | Japan boms Pearl Harbour. |
| 7 Dec | Japan declare war on USA. |
| 7 Dec | Japan invades Siam and Malaysia. |
| 8 Dec | The allies (not Soviet Union) declare war on Japan. |
| 8 Dec | Japan invades Phillipines. |
| 8 Dec | The first gassing of jews (in Chelmno, Polen). |
| 9 Dec | Egypt, Mexico, Panama, Cuba, Dominican Republic etc declare war on Japan. |
| 10 Dec | Nya Zealand, South Africa, India, Bolivia etc declare war on Japan. |
| 11 Dec | Germany and Italy declare war on USA. |
| 11 Dec | Guatemala, Costa Rica and Dominican Republic declare war on Germany. |
| 13 Dec | Bulgaria, Hungary, Croatia, Slovakia and Romania declare war on USA. |
| 19 Dec | Hitler takes complete personal command of the German Army. |
| 25 Dec | Japanese troops capture Hong Kong. |
| 25 Dec | British troops capture Benghazi. |