James Allnut Cason Jr. (July 25, 1927 – November 24, 2013) was an American professional football safety and halfback who played eight seasons in the All-America Football Conference (AAFC) and the National Football League (NFL), mainly for the San Francisco 49ers. He was selected for two Pro Bowls. He also started one game at quarterback in 1954 after Y. A. Tittle broke his left hand. However, Cason was relieved by Tittle in the fourth quarter of the game. He was the backfield coach for the American Football League's (AFL) Denver Broncos in the team's inaugural season in 1960. He died November 24, 2013, in Harlingen, Texas.