World War 2 Countries
Axis Powers (signers of the Tripartite Treaty)
Germany
Italy
Japan
Co-signers of the Tripartite Treaty
Bulgaria (March 1st, 1941)
Hungary (November 20th, 1940
Romania (November 23rd, 1940)
Slovakia(1) (November 24th, 1940)
Countries that were annexed by, or at war with, Axis Powers before the World War II
Austria (annexed to Germany, "Anschluss", March 13th, 1938)
Ethiopia (annexed by Italy in 1936, after the Abyssinia crisis, independence restored in 1941
Republic of China (at war with Japan since 1931)
Allied Powers
Australia
Brazil
Canada
Newfoundland
New Zealand
South Africa
Soviet Union (from June 1941)
United Kingdo
United States (from December 1941)
Supporters of the Allies
Argentina
Bolivia
Chile
Colombia
Costa Rica
Cuba
Dominican Republic
Ecuador
Egypt(2)
El Salvador
Guatemala
Haiti
Honduras
Iraq
Lebanon
Liberia
Mexico
Mongolia
Nicaragua
Panama
Paraguay
Peru
Saudi Arabia
Turkey
Uruguay
Venezuela
Countries that were attacked, occupied, or switched sides during the war
Algeria
Albania (occupied by Italy April 7th 1939, by Germany September 26th 1943)
Belgium (invaded by Germany May 10th 1940)
Burma
Czechoslovakia(1) (Bohemia and Moravia occupied by Germany March 15th 1939)
Denmark (occupied by Germany April 9th 1940, Greenland occupied by USA April 9th, 1941)
Estonia (occupied by the Soviet Union from June 18th 1940, by Germany September, 5th 1941, re-annexed by the Soviet Union in 1944)
Finland (attacked by the Soviet Union November 30th 1939 and June 26th 1941)
France (surrendered to Germany June 22nd 1940)
Greece(invaded by Italy October 28th 1940, German occupation from April 6th, 1941)
Iceland (occupied by Great Britain May 10th 1940, by USA from July, 1941)
India
Iran
Latvia(occupied by the Soviet Union from June 18th 1940, by Germany June 25th, 1941, re-annexed by the Soviet Union in 1944)Lithuania (occupied by the Soviet Union from June 18th 1940, by Germany June 22nd, 1941, re-annexed by the Soviet Union in 1944)
Luxembourg (invaded by Germany May 10th 1940
Morocco
The Netherlands (invaded by Germany May 10th 1940)
New Guinea
Norway (invaded by Germany April 9th 1940
Philippines
Poland (invaded by Germany and the Soviet Union in September, 1939)
Singapore
Syria
Thailand
Tunisia(Occupied by USA in 1943
Yugoslavia(3) (German occupation from April 6th 1941)
Countries that remained nominally neutral
Ireland
Portugal
Spain
Sweden (with exception for the Winter War
Switzerland
Axis Powers (signers of the Tripartite Treaty)
Germany
Italy
Japan
Co-signers of the Tripartite Treaty
Bulgaria (March 1st, 1941)
Hungary (November 20th, 1940
Romania (November 23rd, 1940)
Slovakia(1) (November 24th, 1940)
Countries that were annexed by, or at war with, Axis Powers before the World War II
Austria (annexed to Germany, "Anschluss", March 13th, 1938)
Ethiopia (annexed by Italy in 1936, after the Abyssinia crisis, independence restored in 1941
Republic of China (at war with Japan since 1931)
Allied Powers
Australia
Brazil
Canada
Newfoundland
New Zealand
South Africa
Soviet Union (from June 1941)
United Kingdo
United States (from December 1941)
Supporters of the Allies
Argentina
Bolivia
Chile
Colombia
Costa Rica
Cuba
Dominican Republic
Ecuador
Egypt(2)
El Salvador
Guatemala
Haiti
Honduras
Iraq
Lebanon
Liberia
Mexico
Mongolia
Nicaragua
Panama
Paraguay
Peru
Saudi Arabia
Turkey
Uruguay
Venezuela
Countries that were attacked, occupied, or switched sides during the war
Algeria
Albania (occupied by Italy April 7th 1939, by Germany September 26th 1943)
Belgium (invaded by Germany May 10th 1940)
Burma
Czechoslovakia(1) (Bohemia and Moravia occupied by Germany March 15th 1939)
Denmark (occupied by Germany April 9th 1940, Greenland occupied by USA April 9th, 1941)
Estonia (occupied by the Soviet Union from June 18th 1940, by Germany September, 5th 1941, re-annexed by the Soviet Union in 1944)
Finland (attacked by the Soviet Union November 30th 1939 and June 26th 1941)
France (surrendered to Germany June 22nd 1940)
Greece(invaded by Italy October 28th 1940, German occupation from April 6th, 1941)
Iceland (occupied by Great Britain May 10th 1940, by USA from July, 1941)
India
Iran
Latvia(occupied by the Soviet Union from June 18th 1940, by Germany June 25th, 1941, re-annexed by the Soviet Union in 1944)Lithuania (occupied by the Soviet Union from June 18th 1940, by Germany June 22nd, 1941, re-annexed by the Soviet Union in 1944)
Luxembourg (invaded by Germany May 10th 1940
Morocco
The Netherlands (invaded by Germany May 10th 1940)
New Guinea
Norway (invaded by Germany April 9th 1940
Philippines
Poland (invaded by Germany and the Soviet Union in September, 1939)
Singapore
Syria
Thailand
Tunisia(Occupied by USA in 1943
Yugoslavia(3) (German occupation from April 6th 1941)
Countries that remained nominally neutral
Ireland
Portugal
Spain
Sweden (with exception for the Winter War
Switzerland