Andrew Jackson Leonard (June 1, 1846 – August 21, 1903) was a professional baseball player of the 19th century, who played outfield and was also a utility infielder. He played left field for the original Cincinnati Red Stockings, the first fully professional baseball team. He was one of five men to play regularly for both the Cincinnati and the Boston Red Stockings, the latter winning six championships during his seven seasons. He played several infield positions on lesser teams in his early twenties but left field was his regular professional position.