The Revolutionary Socialist League (German: Revolutionär Sozialistischen Bund, RSB) is a small Trotskyist group in Germany. It was formed in 1994 as a split from the Association for Solidarity Perspectives (VsP). The RSB generally considers itself to be more radical than the VsP, and unlike the VsP it is very critical of the Left Party. Along with the International Socialist Left, the RSB is one of the two factions which form the German section of the United Secretariat of the Fourth International.
RSB publishes the monthly magazine Avanti.