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. 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.