The 1998 United States Senate election in Idaho was held November 3, 1998 alongside other elections to the United States Senate in other states as well as elections to the United States House of Representatives and various state and local elections. Incumbent Republican U.S. Senator Dirk Kempthorne decided to retire after one term to run for governor. Republican nominee Mike Crapo won the open seat.

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1998 United States Senate election in Idaho

← 1992 November 3, 1998 2004 →

Nominee Mike Crapo Bill Mauk Party Republican Democratic Popular vote 262,966 107,375 Percentage 69.54% 28.39%

County results Crapo:      40–50%      50–60%      60–70%      70–80%      80–90%      >90%

U.S. senator before election Dirk Kempthorne Republican Elected U.S. Senator Mike Crapo Republican

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• 1998 United States Senate elections