World War II: Declarations of War 1939–45

Declared by

Against

Date

Germany	Poland	none; invaded September 1, 1939
UK, France, Australia, New Zealand	Germany	September 3, 1939
Canada	Germany	September 10, 1939
USSR	Poland	none; invaded September 17, 1939
USSR	Finland	November 13, 1939
Germany	Denmark, Norway	none; invaded April 9, 1940
Germany	Holland, Belgium	none; invaded May 10, 1940
Italy	UK, France	June 10, 1940
Italy	Greece	none; invaded October 28, 1940
Bulgaria	Allies	April 6, 1941
Germany	Greece, Yugoslavia	none; invaded April 6, 1941
Italy	Yugoslavia	none; invaded April 6, 1941
Germany	USSR	none; invaded June 22, 1941
USSR	Germany	June 22, 1941
Italy, Romania	USSR	June 22, 1941
Hungary, Slovakia	USSR	June 27, 1941
Finland	USSR	June 26, 1941
UK	Finland, Hungary, Romania	December 5, 1941
Japan	UK, United States	December 7, 1941
United States	Japan	December 8, 1941
United States	Germany, Italy	December 11, 1941
Germany, Italy	United States	December 11, 1941
Hungary	United States	December 11, 1941
Brazil	Germany, Italy	August 22, 1942
Bolivia	Germany, Italy, Japan	April 7, 1943
Iran	Germany	September 9, 1943
Italy	Germany	October 13, 1943
Liberia	Germany, Japan	January 26, 1944
Romania	Germany	August 25, 1944
Bulgaria	Germany	September 7, 1944
Ecuador	Germany, Japan	February 2, 1945
Peru	Germany, Japan	February 11, 1945
Chile	Japan	February 14, 1945
Venezuela	Germany, Japan	February 16, 1945
Turkey	Germany, Japan	February 23, 1945
Uruguay	Germany, Japan	February 22, 1945
Egypt	Germany, Japan	February 24, 1945
Syria	Germany, Japan	February 26, 1945
Lebanon	Germany, Japan	February 27, 1945
Saudi Arabia	Germany, Japan	March 1, 1945
Iran	Japan	March 1, 1945
Finland	Germany	March 4, 1945, but a state of war was held to have existed from September 15, 1944
Argentina	Germany, Japan	March 27, 1945
Brazil	Japan	June 6, 1945
USSR	Japan	August 8, 1945

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World War II

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