The 1981 NCAA Division I-AA football season, part of college football in the United States organized by the National Collegiate Athletic Association at the Division I-AA level, began in August 1981 and concluded with the 1981 NCAA Division I-AA Football Championship Game on December 19, 1981, at Memorial Stadium in Wichita Falls, Texas. The Idaho State Bengals won their first I-AA championship, defeating the Eastern Kentucky Colonels in the Pioneer Bowl, 34−23.

Conference changes and new programs

Conference standings

Conference champions

Postseason

After holding four-team playoffs after the first three I-AA seasons, the NCAA increased the bracket size to eight this postseason. It grew to twelve in 1982 and sixteen in 1986. The eight-team field was determined via automatic bids to five conference champions (Idaho State, South Carolina State, Eastern Kentucky, Jackson State, and Rhode Island), a bid to the top-ranked independent team (Tennessee State), and two at-large bids (Boise State and Delaware).

NCAA Division I-AA playoff bracket

• Next to team name denotes host institution
• Next to score denotes overtime Source: