Belfair is a census-designated place in Mason County, Washington, United States. Located on the Union River, headwaters of the Hood Canal, a branch of Puget Sound, it serves as the commercial center of North Mason County. The population of the surrounding area swells in the summertime as tourists and nature lovers flock to the Canal and the Olympic Peninsula. The population within the Urban Growth Area (UGA) is an estimated 700.
Belfair was originally called Clifton, as were several other towns in the state. To avoid confusion, it was renamed in 1925 by Mrs. Murray, the postmaster, who submitted the name Belfair from a book that she was then reading.Belfair is home to "The Taste of Hood Canal", an annual event falling on the second Saturday in August. This festival features local artists, foods, a classic car show and is sponsored by the North Mason Rotary Club.