Axis Powers (signers of the Tripartite Treaty)

• Germany
• Italy
• Japan

• Hungary (November 20th, 1940)
• Romania (November 23rd, 1940)
• Slovakia⁽¹⁾ (November 24th, 1940)
• Bulgaria (March 1st, 1941)
• Yugoslavia (March 25th, 1941)⁽³⁾

• Austria (annexed by Germany, "Anschluss", March 13th, 1938)
• Czechoslovakia (Sudetenland annexed by Germany, October 10th, 1938)
• Ethiopia (annexed by Italy in 1936, after the Abyssinia crisis, independence restored in 1941)
• Korea (made a colony of Japan in 1910)
• Republic of China (at war with Japan since 1931)

• Australia
• Brazil
• Canada
• France ⁽⁴⁾ and her colonies⁽⁵⁾
• New Zealand
• Poland
• South Africa
• Soviet Union (from June 1941)
• United Kingdom and the British Empire.
• United States (from December 1941)

• Albania (occupied by Italy April 7th 1939, by Germany September 26th 1943)
• Belgium (invaded by Germany May 10th 1940)
• 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 (annexed by the Soviet Union June 18th 1940, occupied 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)
• 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)
• Iran (occupied by Great Britain and the Soviet Union, August 1941 to May 1946)
• Latvia (annexed by the Soviet Union June 18th 1940, occupied by Germany June 25th 1941, re-annexed by the Soviet Union in 1944)
• Lithuania (annexed by the Soviet Union June 18th 1940, occupied by Germany June 22nd 1941, re-annexed by the Soviet Union in 1944)
• Luxembourg (invaded by Germany May 10th 1940)
• The Netherlands (invaded by Germany May 10th 1940)
• New Guinea (occupied by Japan, September 1942-August 1945)
• Norway (invaded by Germany April 9th 1940)
• Philippines (occupied by Japan, December 1941-June 1945)
• Syria (occupied by Free French and British, June 1940-April 1946
• Thailand (Occupied by Japan, declared war on the United States and United Kingdom on January 25 1942)
• Tunisia (Used by Italian and German troops to attack Egypt. Later occupied by Allied forces)

• 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

• Andorra
• Ireland
• Liechtenstein
• Portugal
• Spain
• Sweden (with exception for the Winter War)
• Switzerland

1. Slovakia proclaimed independence of Czechoslovakia on March 14th, 1939. Nazi German influence and Wehrmacht presence was considerable until the German occupation in September 1944. The rest of Czechoslovakia, the provinces Bohemia and Moravia, were occupied by Germany March 15th 1939, and proclaimed German protectorates. Czech nationals fought extensively on the Allied side.
2. Egypt was technically neutral, but Cairo soon became a major military base for the British forces. This was because of a 1936 treaty which gave Britain the right to station troops on Egyptian soil in order to protect the Suez Canal.
3. Yugoslavia began the war as a neutral but Yugoslavia's Regent signed the Tripartite Treaty on March 25th, 1941, and met an anti-Nazi coup d'état when he returned on March 27th. This led to German occupation from April 6th 1941.
4. France surrendered to Germany on June 22nd 1940, and the Vichy government was installed, which cooperated with the Germans. However, substantial French forces escaped the German advance or switched sides and continued to fight on the Allied side as Free French.
5. French colonies initially fought alongside their parent country. When France surrendered most recognised the Vichy government.