| 1 Jan | Declaration of the United Nations signed by 26 nations. |
| 1 Jan | Soviet troops begins offensive against Finland. |
| 2 Jan | Japanese troops capture Manila, Phillipines. |
| 10 Jan | Japanese troops invade Netherlands East Indies. |
| 11 Jan | Japanese troops capture Kuala Lumpur, Malaysia. |
| 12 Jan | Japanese troops invade Burma. |
| 13 Jan | German U-boats begin an offensive along east coast of USA. |
| 13 Jan | Soviet troops recapture Kiev. |
| 20 Jan | SS-Obergruppenführer Reinhard Heydrich chairs to the Wannsee Conference to coordinate the "Final Solution of the Jewish Question". |
| 21 Jan | German troops in North Africa begins an offensive. |
| 25 Jan | Japanese troops land on the Salomon Islands. |
| 26 Jan | The first american troops arrive in Britain. |
| 15 Feb | Japanese troops capture Singapore. |
| 19 Feb | Japanese troops capture Bali. |
| 20 Feb | Japanese troops capture Timor. |
| 8 Mar | Japanese troops capture Rangoon, Burma. |
| 9 Mar | Japanese troops capture Java. |
| 20 Mar | First use of the gaschambers in Auschwitz-Birkenau. |
| Apr | Japanese-American sent to relocation camps. |
| 18 Apr | USA bombs Tokyo and Yokohama. (Doolittle raid) |
| 1 May | Japanese troops capture Mandalay, Burma. |
| 4 May | Battle of the Coral Sea. Japan loses aircraft carrier Shoho and USA loses USS Lexington. |
| 6 May | British troops capture Madagaskar. |
| 6 May | The american troops on Phillipines surrenders. |
| 8 May | German troops begin offensive on the Crimea. |
| 22 May | Mexico declare war on the axis powers. |
| 27 May | Assination attempt on Reinhard Heydrich in Prague. He dies 4 June. |
| 28 May | German troops capture Kharkov. |
| 4 June | Battle of Midway ends with one american aircraft (USS Yorktown) and four japanese (Akagi, Kaga, Soryu and Hiryu) aircraft carriers sunk. |
| 10 June |
German troops destroys Lidicie in retaliation of the murder of Heydrich. |
| 21 June | German troops capture Tobruk, Libya. |
| 24 June | German troops enter Egypt |
| 3 July | German troops capture Sevastopol. |
| 3 July | Japanese troops land at Guadalcanal. |
| 22 July |
Deportation of jews from Warsaw to Treblinka begins. |
| 27 July | German troops capture Rostov. |
| 7 Aug | American troops land on Guadalcanal. |
| 12 Aug | Churchill and Stalin meet in Moscow. |
| 19 Aug | Failed allied raid on Dieppe. |
| 22 Aug | Brazil declares war on Germany and Italy. |
| 31 Aug | German troops attack the british at El Alamein. |
| 16 Sep | German troops reach Stalingrad. |
| 23 Oct | Battle of El Alamein begins. |
| 8 Nov | The Allies land in north-west Africa (Operation Torch). |
| 11 Nov | German troops invade Vichy France. |
| 11 Nov | British troops enters Libya. |
| 13 Nov | British troops capture Tobruk. |
| 19 Nov | Soviet troops begin counter-offensive at Stalingrad. |
| 27 Nov |
The french fleet in Toulon is sunk. |
| 30 Nov | Fierce german resistance halts the allied offensive in North Africa. |
| 18 Dec | The allies declare that the crimes against jews will be avenged. |