David Bruce Cassidy (born April 12, 1950) is an American prolific character actor of stage, singer, occasional songwriter and guitarist. He is best known for his role as Shirley Jones's eldest son, Keith Partridge, in the 1970s musical/sitcom The Partridge Family from 1970 to 1974 (Jones is Cassidy's stepmother in real life.) He enjoyed a successful pop career in the 1970s, and still performs today.

David Cassidy was born at Flower and Fifth Avenue Hospital in New York, New York, the son of actor Jack Cassidy and actress Evelyn Ward. As his parents were frequently touring on the road, he spent his early years being raised by his grandparents in a middle class neighborhood in West Orange, New Jersey. In 1956, he found out from neighbor children that his parents had been divorced for over two years and had not even told him.

In 1956, his father married actress Shirley Jones, and three half-brothers were born: Shaun (1958), Patrick (1962) and Ryan (1966).