William Earl Potteiger (February 11, 1893 – April 7, 1959) was a professional American football running back and coach. Potteiger played professionally in both baseball and football and coached professionally in basketball, baseball and football. He is most famous as a player-coach for the New York Giants when they won their first NFL championship in 1927. He also played minor league baseball from 1913 to 1917, in 1919, and from 1926 to 1927. He managed in the minors from 1926 to 1927 and in 1932.