Shaun Paul Cassidy (born September 27, 1958) is an American television producer/creator, screenwriter, and former actor and singer. He is the eldest son of Academy Award-winning singer-actress Shirley Jones and Tony Award-winning singer-actor Jack Cassidy. His older half-brother is singer/actor David Cassidy.

In the late-1970s, Cassidy was a popular singer and actor. He starred in the television series The Hardy Boys Mysteries, and the short-lived Breaking Away. He had a number of hit records, and did numerous arena tours nationwide. In the 1980s Cassidy had a three-month stint on the daytime soap General Hospital and acted on Broadway and in the West End of London. Since the mid-1990s, Cassidy has worked exclusively as a writer/producer in television, creating a number of critically acclaimed television series, including American Gothic, Roar (with Heath Ledger in his American debut), and Invasion.