Fritz William Weaver (Pittsburgh, Pennsilvània, 19 de gener de 1926 - Manhattan, Nova York, 26 de novembre de 2016) va ser un actor nord-americà. Va aparèixer en més de 170 produccions de teatre, televisió i cinema en una carrera de gairebé 60 anys.

Fritz William Weaver (January 19, 1926 − November 26, 2016) was an American actor in television, stage, and motion pictures. He portrayed Dr. Josef Weiss in the 1978 epic television drama Holocaust, for which he was nominated for a Primetime Emmy Award. In cinema, he made his debut in the film Fail Safe (1964) and also appeared in Marathon Man (1976), Creepshow (1982), and The Thomas Crown Affair (1999). Among many television roles, he performed in the movie The Legend of Lizzie Borden (1975). He also worked in science fiction and fantasy, especially in television series and movies like The Twilight Zone, 'Way Out, Night Gallery, The X-Files, The Martian Chronicles, and Demon Seed.