Encyclopedia > List of countries involved in World War II

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List of countries involved in World War II

Formal Participants in World War II

Axis Powers (signers of the Tripartite Treaty)

co-signers of the Tripartite Treaty

Countries that were annexed by Axis Powers before the World War II

Allied Powers

Countries that were at war with Axis Powers before the World War II

  • China (at war with Japan since 1931)

Supporters of the Allies

Countries that were attacked, occupied, or switched sides during the war
(Most countries below had declared their neutrality before being assaulted.)

Countries that remained nominally neutral


  1. Slovakia proclaims independence of Czechoslovakia on March 14th, 1939. Slovakia became a German protectorate. The rest of Czechoslovakia, the provinces Bohemia and Moravia, were occupied by Germany March 15th 1939.
  2. Egypt was technically neutral,but Cairo soon became a major military base for the British forces. This was because of a 1936 treaty by which Britain argued it had 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.

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