1915 Idaho football team

The 1915 Idaho football team represented the University of Idaho in the 1915 college football season. Idaho was led by first-year head coach Charles Rademacher and played as an independent; they joined the Pacific Coast Conference seven years later in 1922. Idaho had two home games in Moscow on campus at MacLean Field, with none in Boise.

In the season opener, Idaho fell to Montana for the first time in the series' third meeting, losing 15–3 in Missoula. Idaho dropped a second consecutive shutout to Washington State in the Battle of the Palouse, falling 0–41 at home. Eight years later, the Vandals won the first of three consecutive, their only three-peat in the rivalry series.

Idaho opened the season with four losses, then won and tied a game for a 1–4–1 record. They scored just nine points all season, and the only touchdown was an interception return, which defeated. Their only points on offense came on a drop-kick field goal in the first quarter of the opener at Montana.

A fatality occurred at practice on October 6; a part-time player, Chauncey Lyman of Idaho Falls, was knocked unconscious after his head impacted a ball carrier's thigh. Lyman died about an hour later, and the cause of death was a basilar skull fracture. |undefined