Cannon was a detective series which ran on CBS from 1971 to 1976. It starred William Conrad as the overweight detective Frank Cannon, who charged high fees to his well-to-do clients so that he could work for poorer clients at little or not charge. He also used it to indulge his high-priced lifestyle, which included maintenance on his Lincoln Continental, which was frequently wrecked.

Frank Cannon frequently crossed over to appear on Barnaby Jones.