| Election Name: | 2004 United States Senate election in Oregon |
| Country: | Oregon |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1998 United States Senate election in Oregon |
| Previous Year: | 1998 |
| Next Election: | 2010 United States Senate election in Oregon |
| Next Year: | 2010 |
| Election Date: | November 2, 2004 |
| Nominee1: | Ron Wyden |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 1,128,728 |
| Percentage1: | 63.39% |
| Nominee2: | Al King |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 565,254 |
| Percentage2: | 31.75% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Ron Wyden |
| Before Party: | Democratic Party (United States) |
| After Election: | Ron Wyden |
| After Party: | Democratic Party (United States) |
The 2004 United States Senate election in Oregon was held on November 2, 2004. Incumbent Democratic U.S. Senator Ron Wyden won re-election to a second full term. As of, this is the most recent United States Senate election in Oregon in which any Eastern Oregon counties voted for the Democratic nominee, and it is Oregon's most recent senatorial election in which the winning candidate carried the majority of the state's counties.
Wyden was unopposed in the Democratic primary.
|-| | colspan=5 |Democrat hold
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