| Year: | 1920 |
| Team: | LSU Tigers |
| Sport: | football |
| Conference: | Southern Intercollegiate Athletic Association |
| Short Conf: | SIAA |
| Record: | 5–3–1 |
| Conf Record: | 1–3 |
| Head Coach: | Branch Bocock |
| Hc Year: | 1st |
| Captain: | Roy L. Benoit |
| Stadium: | State Field |
The 1920 LSU Tigers football team represented the University of Louisiana (now known as Louisiana State University or LSU) as a member of the Southern Intercollegiate Athletic Association (SIAA) during the 1920 college football season. Led by first-year head coach Branch Bocock, the Tigers compiled an overall record of 5–3–1, with a mark of 1–3 in conference play, and finished tied for 18th in the SIAA. LSU played home games at State Field in Baton Rouge, Louisiana.