The International Workers League (Fourth International) (Spanish: Liga Internacional de los Trabajadores (Quarta Internacional)) is a Trotskyist international organisation. Its members include the International Socialist Leagues of the UK and Australia and parties in South America including Frente Obrero Socialista (FOS) in Argentina and Partido Socialista dos Trabalhadores Unificado in Brazil.

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See also: List of Trotskyist internationals