John "Jack" Leonard (1876 – after 1899) was an English professional footballer who played in the Football League for Small Heath.Leonard was born in Gloucester. A clever dribbler on the right wing, he had a fine season in the Southern League with Bedminster, but fell out of favour and joined Small Heath in November 1899. He went straight into the starting eleven, making his debut in the Football League Second Division on 11 November in a 3–0 defeat at New Brighton Tower.