Belfair State Park, State park in Mason County, United States.

Belfair State Park covers 94 acres on Hood Canal, three miles southwest of Belfair in Mason County, Washington. Its 3,720-foot saltwater shoreline fronts tidal flats, wetlands and beaches, and the land rises only about 3 metres above sea level. The park is used for camping, fishing, swimming, clam digging, crabbing, birdwatching and field sports.

The park was established in 1952 by the Washington State Parks and Recreation Commission to provide public access to natural areas in western Washington. This creation reflected a broader effort to protect coastal landscapes across the region.

The park lies on Hood Canal in Mason County, on the traditional territory of the Twana (Skokomish) people, whose name for the Belfair area is recorded as "twanoh." The nearby town of Belfair grew from a settlement called Clifton in the 1880s. Clam digging and crabbing remain popular activities on the tidal flats.

The park lies on Hood Canal, three miles southwest of Belfair in Mason County. Its 3,720-foot shoreline of tidal flats, wetlands and beaches is exposed at low tide, so time clam digging and crabbing around the tide tables. Camping, fishing, swimming, birdwatching and field sports are the activities on offer.

The park's 3,720-foot shoreline on Hood Canal gives access to tidal flats exposed at low tide, where visitors dig clams and set crab pots. Birdwatchers scan the flats and wetlands for shorebirds. The park lies three miles southwest of Belfair and 4.4 km from the town center.