Socialist Union may refer to:
Arab Socialist Union (disambiguation), several organizations People's Socialist Union, an Ivorian political party based in London, founded in 1996 Socialist Union of America, a Trotskyist group active from 1954 to 1959 Socialist Union of Catalonia, active from 1923 to 1936 Socialist Union (Chile) Socialist Union (Internationalist), an ex-Posadist group active in the early 1970s Socialist Union of Popular Forces, the largest political party in Morocco, founded in 1959 Socialist Union (UK), a social democratic group active from 1885 to 1887 Socialist Union (UK, 1950s), a social democratic group active in the Labour Party from 1950 to 1959 Sudanese Socialist Union
See also Socialist Unionists, a Nasserist political party in Syria, founded in 1961 Socialist Unity (disambiguation)