William Castle Rhodes was American football player and coach. Rhodes played tackle at Yale University from 1887 to 1890 and was selected for the 1890 College Football All-America Team. After playing for the Cleveland Athletic Club and coaching at Western Reserve in 1891, Rhodes return to his alma mater to serve as head coach for the Yale Bulldogs football team in 1893 and 1894, compiling a record of 26–1. Rhodes' 1894 team won all 16 of its games and was later recognized as a national champion by a number of selectors.

The Allegheny Athletic Association was an athletic club that fielded the first ever professional American football player and later the first fully professional football team. The organization was founded in 1890 as a regional athletic club in Allegheny, Pennsylvania, which is today the North Side of Pittsburgh.