The 1946 Idaho gubernatorial election was held on November 5. Republican nominee C. A. Robins defeated Democratic incumbent Arnold Williams with 56.37% of the vote.
Idaho changed the term for governor from two to four years starting with this election, and the winner was not allowed to run for a second term (self-succession) until 1958. Williams had become governor in November 1945, following the resignation of Charles Gossett, whom Williams immediately appointed to the U.S. Senate.
Primary elections were held on June 11, 1946.