Robert Wallace Foster Jr., known professionally as Robert Forster, was an American actor, known for his roles as John Cassellis in Medium Cool (1969), Captain Dan Holland in The Black Hole (1979), Abdul Rafai in The Delta Force (1986), and Max Cherry in Jackie Brown (1997), for which he was nominated for the Academy Award for Best Supporting Actor.

Medium Cool is a 1969 American drama film written and directed by Haskell Wexler and starring Robert Forster, Verna Bloom, Peter Bonerz, Marianna Hill and Harold Blankenship. It takes place in Chicago in the summer of 1968. It was notable for Wexler's use of cinéma vérité-style documentary filmmaking techniques, as well as for combining fictional and non-fictional content.