| Year: | 2021 |
| Team: | Stony Brook Seawolves |
| Sport: | football |
| Conference: | Colonial Athletic Association |
| Short Conf: | CAA |
| Record: | 5–6 |
| Conf Record: | 4–4 |
| Head Coach: | Chuck Priore |
| Hc Year: | 16th |
| Cooff Coach1: | Chris Bache |
| Cooc1 Year: | 7th |
| Def Coach: | Rob Noel |
| Dc Year: | 2nd |
| Stadium: | Kenneth P. LaValle Stadium |
The 2021 Stony Brook Seawolves football team represented the Stony Brook University as a member of the Colonial Athletic Association (CAA) in the 2021 NCAA Division I FCS football season. The Seawolves, led by 16th-year head coach Chuck Priore, played their home games at Kenneth P. LaValle Stadium.