Two human polls and a committee's selections comprise the 2021 National Collegiate Athletic Association (NCAA) Division I Football Bowl Subdivision (FBS) football rankings, in addition to various publications' preseason polls. Unlike most sports, college football's governing body, the NCAA, does not bestow a national championship at the FBS level. Instead, that title is bestowed by one or more different polling agencies. There are two main weekly polls that begin in the preseason—the AP Poll and the Coaches Poll. One additional poll, the College Football Playoff (CFP) ranking, is usually released starting midway through the season. The CFP rankings determine who makes the four-team playoff that determines the College Football Playoff National Champion.