| Election Name: | 1998 United States Senate election in Washington |
| Country: | Washington |
| Type: | presidential |
| Ongoing: | no |
| Previous Election: | 1992 United States Senate election in Washington |
| Previous Year: | 1992 |
| Next Election: | 2004 United States Senate election in Washington |
| Next Year: | 2004 |
| Election Date: | November 3, 1998 |
| Image1: | Patty Murray official portrait.jpg |
| Nominee1: | Patty Murray |
| Party1: | Democratic Party (United States) |
| Popular Vote1: | 1,103,184 |
| Percentage1: | 58.41% |
| Nominee2: | Linda Smith |
| Party2: | Republican Party (United States) |
| Popular Vote2: | 785,377 |
| Percentage2: | 41.59% |
| Map Size: | 270px |
| U.S. Senator | |
| Before Election: | Patty Murray |
| Before Party: | Democratic Party (United States) |
| After Election: | Patty Murray |
| After Party: | Democratic Party (United States) |
The 1998 United States Senate election in Washington was held November 3, 1998. Incumbent Democratic U.S. Senator Patty Murray won re-election to a second term.
The election was not close, with Murray winning by 16.8% of the vote. Murray won in a landslide victory by racking up huge margins in Western Washington. Specifically, Murray trounced Smith in the state’s most populous county, King County. Murray also won six counties in the historically conservative eastern part of the state. Murray was sworn in for a second term on January 3, 1999.