| Washington State Open | |
|---|---|
| Tournament information | |
| Tour | USTA Circuit |
| Founded | 1890 |
| Editions | 130 |
| Location | Seattle, Washington, United States |
| Venue | Seattle TC |
| Surface | Hard |
| Prize money | $32,000 (combined) |
The Washington State Open is a USTA affiliated hard court tennis tournament founded in 1890 as the Washington State Championships. The tournament is played at the Seattle Tennis Club, Seattle, Washington in the United States.