The Fourth International can refer to:

• The Fourth International - World Party of Socialist Revolution, founded by Trotskyists in 1938, which organisationally continues as the Fourth International (post-reunification)
• Various groups which claim the political heritage of the Fourth International:
  • The Fourth International Posadist
  • The International Committee of the Fourth International
• The Communist Workers' International of left communists, founded in 1923.

See also

• List of Trotskyist internationals

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