Shaun Paul Cassidy (born September 27, 1958) is an American singer, actor, writer and producer. He has created and/or produced a number of television series including American Gothic, Roar and Invasion. Cassidy was also an executive producer and writer for NBC's medical drama New Amsterdam.

While in high school, Cassidy signed a contract with Warner Bros. Records, leading to his albums Shaun Cassidy, Born Late, Under Wraps, Room Service, and Wasp. Almost concurrently, Cassidy starred in the ABC television series The Hardy Boys Mysteries, as well as Breaking Away and had a stint on the daytime soap General Hospital.

While appearing on Broadway in the hit musical drama Blood Brothers, he wrote his first television pilot, American Gothic. In 2020, Cassidy returned to the stage with his one-man show The Magic of a Midnight Sky. Cassidy is the eldest son of Academy Award–winning actress Shirley Jones and Tony Award-winning actor Jack Cassidy.

He is the younger half-brother of David Cassidy.