| Bill Warner | |
| Birth Date: | 24 January 1881 |
| Birth Place: | Springville, New York, U.S. |
| Death Place: | Portland, Oregon, U.S. |
| Player Years1: | 1899–1902 |
| Player Team1: | Cornell |
| Player Years2: | 1902 |
| Player Team2: | Syracuse A. A. |
| Player Positions: | Guard |
| Coach Years1: | 1903 |
| Coach Team1: | Cornell |
| Coach Years2: | 1904 |
| Coach Team2: | Sherman Institute (CA) |
| Coach Years3: | 1905 |
| Coach Team3: | North Carolina |
| Coach Years4: | 1906–1907 |
| Coach Team4: | Colgate |
| Coach Years5: | 1908 |
| Coach Team5: | Sherman Institute (CA) |
| Coach Years6: | 1909 |
| Coach Team6: | Saint Louis |
| Coach Years7: | 1910–1911 |
| Coach Team7: | Oregon |
| Overall Record: | 28–20–5 |
| Awards: |
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| Cfbhof Year: | 1971 |
| Cfbhof Id: | 1224 |
William Jay Warner (January 24, 1881 – February 12, 1944) was an American football player and coach. Warner graduated from Cornell University in 1903 and was a member of the Sphinx Head Society. He was elected to the College Football Hall of Fame in 1971.
Following his playing career at Cornell University, Warner was the head football coach at Cornell University, the University of North Carolina, Colgate University, Saint Louis University, and the University of Oregon. He also coached football at Sherman Institute—now known as Sherman Indian High School—in Riverside, California.[1]
Warner was the brother of famed football coach Pop Warner. In 1902, Bill and Glenn both played pro football for the Syracuse Athletic Club during the first World Series of Football, held at Madison Square Garden. It was during this event, that Warner played in the first professional indoor football game as his Syracuse squad upset the heavily favored "New York" team. While Glenn was injured during the event with a head injury, Bill and the rest of the Syracuse team went on to win the event.