The 1984 United States Senate election in Idaho was held on November 6. Incumbent Senator Jim McClure was re-elected to a third term in office.
Senator McClure was unopposed for re-nomination by the Republican Party.
The campaign was largely uneventful given McClure's large lead in polls and the Republican tendency of Idaho.
During the campaign, Pete Busch was involved in a minor plane crash. Two years later in April 1986, Busch and his wife died in a similar crash while running for Congress.