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 Kingdom
- 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 remained nominally neutral
- Ireland
- Portugal
- Spain
- Sweden (with exception for the Winter War)
- Switzerland
History 