| Year: | 2021 |
| Team: | Harvard Crimson |
| Sport: | football |
| Conference: | Ivy League |
| Short Conf: | Ivy |
| Record: | 8–2 |
| Conf Record: | 5–2 |
| Head Coach: | Tim Murphy |
| Hc Year: | 27th |
| Off Coach: | Mickey Fein |
| Oc Year: | 1st |
| Off Scheme: | Pro spread |
| Def Coach: | Scott Larkee |
| Dc Year: | 12th |
| Def Scheme: | 4–3 |
| Stadium: | Harvard Stadium |
| Prev Year: | 2019 |
The 2021 Harvard Crimson football team represented Harvard University in the 2021 NCAA Division I FCS football season as a member of the Ivy League. The team was led by 27th-year head coach Tim Murphy and played its home games at Harvard Stadium. Harvard averaged 11,201 fans per game.