The 1978 Idaho gubernatorial election was held on Tuesday, November 7, and incumbent Democrat John Evans defeated Republican nominee Allan Larsen with 58.75% of the vote. It was the third consecutive win for the Democrats (1970, 1974, 1978), but the only significant victory for the party in Idaho in 1978. As of 2022, this is the most recent Idaho gubernatorial election in which both major party candidates are now deceased.