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