Division I Football Championship Subdivision
This section covers teams that competed in the second tier of Division I since it was split in 1978:
- Division I-AA from 1978 to 2005
- Football Championship Subdivision (FCS) from 2006
Note that Division I FCS features a single-elimination championship tournament, reducing the likelihood of multiple teams finishing the season with undefeated records. However, several conferences voluntarily do not compete in the tournament, thus there exists a chance to have multiple undefeated teams in the same year.
In both lists in this section, teams in bold competed in the I-AA or FCS playoffs, thereby winning the national title.
Read more about this topic: List Of Undefeated NCAA Division I Football Teams
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