McClain's Law is an American crime drama television series that aired on NBC during the 1981–82 season.

The series starred former Gunsmoke lead James Arness in a rare non-western role as Jim McClain, a former police detective who was medically retired after being wounded in the leg in a gun battle in the line of duty.

He returns to duty fifteen years later to avenge the murder and robbery of a friend, and ends up coming out of retirement in order to share his expertise with a younger generation of police officers.

McClain is made to undergo physical fitness tests and a requalification and training program at the police academy.

On June 21, 2016, Warner Archive Collection released McClain's Law - The Complete Series on DVD in Region 1 for the very first time.