State Route 302 (SR 302) is a 16.87-mile-long (27.15 km) state highway in the U.S. state of Washington, connecting the communities of Allyn-Grapeview and Purdy on the Kitsap Peninsula, located in Mason and Pierce counties. The highway travels southeast from SR 3 in Allyn-Grapeview along North Bay and turns east along Henderson Bay to Purdy. SR 302 intersects its spur route and turns south, ending at an interchange with SR 16 at the north end of Gig Harbor.