John Williams was a British stage, film, and television actor. He is remembered for his role as Chief Inspector Hubbard in Alfred Hitchcock's Dial M for Murder, as the chauffeur in Billy Wilder's Sabrina, as Mr. Brogan-Moore in Witness for the Prosecution (1957), and as the second "Mr. French" on TV's Family Affair in its first season (1967).

Dial M for Murder is a 1954 American crime thriller film directed by Alfred Hitchcock, starring Ray Milland, Grace Kelly, Robert Cummings, Anthony Dawson, and John Williams. Both the screenplay and the successful stage play on which it was based were written by English playwright Frederick Knott. The play premiered in 1952 on BBC Television, before being performed on stage in the same year in London's West End in June, and then New York's Broadway in October.