Fourth International (disambiguation)

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.