Twanoh State Park is a public recreation area located 16 miles (26 km) southwest of Belfair on the east side of Hood Canal in Mason County, Washington.

The state park's 188 acres (76 ha) include 3,167 feet (965 m) of saltwater shoreline and 2.5 miles (4.0 km) of inland hiking trails.

Evidence of the area's logging history of the 1890s can be seen on the park's woodland hiking trails.

The well-preserved complex of structures created in the 1930s by the Civilian Conservation Corps led to the park's being named to the National Register of Historic Places in 2014.

[3] Park activities include camping, hiking, boating, fishing, swimming, waterskiing, crabbing, oyster harvesting, beachcombing, bird watching, wildlife viewing, and horseshoes.