Socialist League may refer to one of several organisations:
Socialist League (Canada) Socialist League (Finland) Socialist League (Germany) Socialist League (Italy) Socialist League (Sweden) Socialist League (Venezuela) Socialist League (UK, 1885), a split from the Social Democratic Federation associated with William Morris Socialist League (UK, 1932), a split from the Independent Labour Party associated with Stafford Cripps Socialist Action (UK), founded 1982, originally officially known as the Socialist League Socialist League of Palestine