List of undefeated Division I-A football teams

This is a list of undefeated NCAA Division I football teams, which describes all teams that finished a college football season in the NCAA's Division I, or historic equivalent, without any losses.

NCAA Division I Football Bowl Subdivision (FBS) is currently the highest division of play in college football. However this nomenclature and these categories of divisional play have only existed since 2006 and 1978, respectively. Prior to the formation of the NCAA in 1906, there was no differentiation between the level of play from one college to another, and thus all intercollegiate teams can be thought of as having played in the same division. Likewise, even after the formation of the NCAA, there was no differentiation into divisions until 1956, when play was separated in the upper "University" division and lower "Collegiate" division. In 1973, a three division reorganization occurred placing teams into NCAA Division I (highest), Division II, or Division III (lowest). In 1978, Division I was further subdivided into Division I-A (highest) and Division I-AA. In 2006, these subdivisions were renamed Division I Football Bowl Subdivision (FBS) and Football Championship Subdivision (FCS), respectively.

The following categories represent the historical equivalents of the highest level of play over the history of college football, and the subsequent tables list the teams for each season that went undefeated while competing in these highest categories:

These teams finished the season having won every game in which they played, thus completing a "perfect season".

note: in 1917, 1918, 1943 and 1944, football teams from military training facilities competed alongside college programs

These teams all finished the season with no losses, but with ties.

Teams ordered by the number of undefeated seasons in the top division. Teams in italics no longer compete in Division I FBS.

Coaches ordered by the number of undefeated seasons in the top division.

Coaches with three undefeated seasons include Don Coryell, Fritz Crisler, Don Faurot, T. A. Dwight Jones, John McKay, Ace Mumford, Frank Murray, William D. Murray, Tom Osborne, Ara Parseghian, Frank Thomas, Wallace William Wade and George Washington Woodruff.

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