I Saw What You Did is a 1965 American thriller film released by Universal Pictures and starring Joan Crawford and John Ireland. The plot follows two teenage girls who find themselves in serious danger after making a prank phone call to a man who just murdered his wife. The screenplay by William P. McGivern was based upon the 1964 novel Out of the Dark by Ursula Curtiss. The film was produced and directed by William Castle.

John Benjamin Ireland was a Canadian-American actor and film director. Born in Vancouver, British Columbia and raised in New York City, he came to prominence with film audiences for his supporting roles in several high-profile Western films, including My Darling Clementine (1946), Red River (1948), Vengeance Valley (1951), and Gunfight at the O.K. Corral (1957). He was nominated for an Academy Award for his role as Jack Burden in All the King's Men (1949), making him the first British Columbia-born actor to receive an Oscar nomination.