1920 Idaho Vandals football team

The 1920 Idaho Vandals football team represented the University of Idaho in the 1920 college football season. Idaho was led by first-year head coach Thomas Kelley in their penultimate season as an independent before joining the Pacific Coast Conference in 1922. The Vandals had one home game in Moscow on campus at MacLean Field, with one in Boise at the state fairgrounds.

Idaho dropped a sixth consecutive game to Washington State in the Battle of the Palouse, falling 7–14 in the opener in Moscow. Three years later, the Vandals won the first of three consecutive, their only three-peat in the rivalry series.

After coming up six points short at Oregon to start with two losses, Idaho won its last four games.