Anthony Sebastian Cristillo (December 10, 1902 – September 13, 1990), professionally known as Pat Costello, was an American actor, producer, stunt double and brother of comedian Lou Costello. He is credited as the executive producer for the American television sitcom The Abbott and Costello Show.

Costello was born in Paterson, New Jersey to Sebastiano Cristillo and Helen Rege. He served in the army during World War I and played the saxophone for bandleader Paul Whiteman as well as his own orchestra.

Costello started his career as an actor in the 1941 Abbott and Costello film Buck Privates. He also served as his brother's stunt double on the first ten Abbott and Costello films.

In 1959, after Lou Costello died of a heart attack, Pat retired from show business.

In 1966, Costello had a bit role in the Jerry Lewis film Three on a Couch.^{[citation needed]}

Costello died in September 1990 of heart failure at his home in Encino, California, at the age of 87.