The 1986 Boise State Broncos football team represented Boise State University as a member of Big Sky Conference during the 1986 NCAA Division I-AA football season.

Led by fourth-year head coach Lyle Setencich, the Broncos compiled an overall record of 5–6 with a mark of 3–4 in conference play, placing fifth in the Big Sky.

Prior to the season, BSU athletic director Gene Bleymaier had blue AstroTurf installed in Bronco Stadium, the first non-green field in the NCAA.

[1][2] Boise State struggled with injuries and had its first losing season in four decades; shortly after the season concluded in Boise with a fifth consecutive loss in the series with rival Idaho, Setencich resigned.

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