State Route 26 (SR 26) is a state highway in the Grant, Adams, and Whitman counties, in the U.S. state of Washington. It extends 133.61 miles (215.02 km) from Interstate 90 (I-90) east of the community of Vantage, east to U.S. Route 195 (US 195) in Colfax. SR 26 intersects SR 24, SR 17, US 395, and SR 261 before ending in Colfax. The route serves as a connector between Vantage, Royal City, Othello, Washtucna, La Crosse, and Colfax.SR 26 has its own spur route located in Colfax.