2021 NCAA Division III football rankings

Two human polls and a committee's selections comprise the 2021 National Collegiate Athletic Association (NCAA) Division III football rankings. Unlike in Division I's Football Bowl Subdivision (FBS), the NCAA, Division III's college football's governing body, bestows a national championship on the winner of the Stagg Bowl – the championship round of a 32-team postseason tournament. The main weekly poll that begins in the preseason is the D3Football.com Poll which ranks the top 25 colleges in Division III football. One additional poll is released midway through the season, the AFCA Division III Coaches' Poll.