| Year: | 1921 |
| Team: | The Citadel Bulldogs |
| Sport: | football |
| Conference: | Southern Intercollegiate Athletic Association |
| Short Conf: | SIAA |
| Record: | 3–3–2 |
| Conf Record: | 1–2–1 |
| Head Coach: | Harry J. O'Brien |
| Hc Year: | 5th |
| Stadium: | College Park Stadium |
The 1921 The Citadel Bulldogs football team represented The Citadel, The Military College of South Carolina in the 1921 college football season. Harry J. O'Brien served as head coach for the second consecutive and fifth season overall The Bulldogs played as members of the Southern Intercollegiate Athletic Association and played home games at College Park Stadium in Hampton Park.[1] [2] [3]