| Election Name: | 1968 United States Senate election in Washington |
| Country: | Washington |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1962 United States Senate election in Washington |
| Previous Year: | 1962 |
| Next Election: | 1974 United States Senate election in Washington |
| Next Year: | 1974 |
| Election Date: | November 5, 1968 |
| Image1: | File:WarrenGMagnuson (cropped).jpg |
| Nominee1: | Warren Magnuson |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 796,183 |
| Percentage1: | 64.41% |
| Nominee2: | Jack Metcalf |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 435,894 |
| Percentage2: | 35.26% |
| Map Size: | 250px |
| U.S. Senator | |
| Before Election: | Warren Magnuson |
| Before Party: | Democratic Party (United States) |
| After Election: | Warren Magnuson |
| After Party: | Democratic Party (United States) |
The 1968 United States Senate election in Washington was held on November 5, 1968. Incumbent Democratic U.S. Senator Warren Magnuson won a fifth term in office, defeating Republican State Senator Jack Metcalf.
The blanket primary was held on September 17, 1968.