| Election Name: | 2004 United States Senate election in Idaho |
| Country: | Idaho |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1998 United States Senate election in Idaho |
| Previous Year: | 1998 |
| Next Election: | 2010 United States Senate election in Idaho |
| Next Year: | 2010 |
| Election Date: | November 2, 2004 |
| Image1: | Mike Crapo official photo.jpg |
| Nominee1: | Mike Crapo |
| Party1: | Republican Party (United States) |
| Popular Vote1: | 499,796 |
| Percentage1: | 99.18% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Mike Crapo |
| Before Party: | Republican Party (United States) |
| After Election: | Mike Crapo |
| After Party: | Republican Party (United States) |
The 2004 United States Senate election in Idaho took place on November 2, 2004, 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 Senator Mike Crapo ran for won a second term in office in a landslide, as he was the only voting option besides a write-in campaign. Democrat Scott McClure conducted a write-in campaign but only received 4,136 votes, or 0.82% of those cast.
On ballot
Write-in
Crapo won every county with over 90% of the vote. His weakest performance by far was in Democratic-leaning Latah County, where he got 95.6% of the vote to McClure's 4.4%.