| Year: | 1915 |
| Team: | Illinois Fighting Illini |
| Sport: | football |
| Conference: | Western Conference |
| Short Conf: | Western |
| Record: | 5–0–2 |
| Conf Record: | 3–0–2 |
| Head Coach: | Robert Zuppke |
| Hc Year: | 3rd |
| Stadium: | Illinois Field |
| Champion: | Western Conference co-champion |
The 1915 Illinois Fighting Illini football team was an American football team that represented the University of Illinois during the 1915 college football season. In their third season under head coach Robert Zuppke, the Illini compiled a 5–0–2 record and finished as co-champions of the Western Conference.[1] Center John W. Watson was the team captain.[2]
| Player | Position |
| John Wesley Watson (captain) | Center |
| Amos Lloyd Brennememan | Right end |
| Reynold Kraft | Right end |
| Ross Petty | Right tackle |
| Olay Madsen | Right tackle |
| Roland A. Cowell | Right tackle |
| Frank Stewart | Right guard |
| Phillip Harry Potter | Center |
| Clarence Applegran | Left guard |
| Fred R. Hanschman | Left guard |
| Elmer Rundquist | Left Tackle |
| Harlan Brown Graham | Left tackle |
| George Kasson Squier | Left end |
| Henry W. Markwardt | Left end |
| George Clark | Quarterback |
| Frank Pursell | Quarterback |
| Bart Macomber | Right halfback |
| Frank Howard Pethybridge | Right halfback |
| John Ward Nelson | Fullback |
| Bernard Hallstrom | Fullback |
| Harold Pogue | Left halfback |
| David E. Connell | Left halfback |