Amos Alonzo Stagg, American baseball player and coach (d. 1965)
Amos Alonzo Stagg (August 16, 1862 – March 17, 1965) was an American athlete and college coach in multiple sports, primarily American football. He served as the head football coach at the International YMCA Training School (now called Springfield College) (1890–1891), the University of Chicago (1892–1932), and the College of the Pacific (1933–1946), compiling a career college football record of 314–199–35 (.605). His undefeated Chicago Maroons teams of 1905 and 1913 were recognized as national champions. He was also the head basketball coach for one season at Chicago (1920–1921), and the Maroons' head baseball coach for nineteen seasons (1893–1905, 1907–1913).

At Chicago, Stagg also instituted an annual prep basketball tournament and track meet. Both drew the top high school teams and athletes from around the United States.

Stagg played football as an end at Yale University and was selected to the first All-America Team in 1889. He was inducted into the College Football Hall of Fame as both a player and a coach in the charter class of 1951 and was the only individual honored in both roles until the 1990s. Influential in other sports, Stagg developed basketball as a five-player sport. This five-man concept allowed his 10 (later 11) man football team the ability to compete with each other and to stay in shape over the winter. Stagg was elected to the Basketball Hall of Fame in its first group of inductees in 1959.

Stagg also forged a bond between sports and religious faith early in his career that remained important to him for the rest of his life.