One Down, Two to Go is a 1982 American independent blaxploitation action drama film written and directed by Fred Williamson and starring Williamson, Jim Brown, Richard Roundtree and Jim Kelly. This is the third film to star Williamson, Brown, and Kelly, following Three the Hard Way and Take a Hard Ride. Williamson, Brown, and Roundtree would reunite nearly fifteen years later in Original Gangstas.

Frederick Robert Williamson, also known as "the Hammer", is an American actor and former professional football defensive back who played mainly in the American Football League (AFL) during the 1960s. Williamson has had a busy film career, starring as Tommy Gibbs in the 1973 crime drama film Black Caesar and its sequel Hell Up in Harlem. Williamson also had roles in other 1970s blaxploitation films such as Hammer (1972), That Man Bolt (1973) and Three the Hard Way (1974).