The Grays Harbor Transportation Authority, doing business as Grays Harbor Transit (and abbreviated as GH Transit), is a public transit agency serving Grays Harbor County in the U.S. state of Washington. It operates ten fixed bus routes traveling through the county's major cities and connecting to Olympia in Thurston County and Centralia in Lewis County, as well as paratransit service, dial-a-ride routes and a vanpool fleet. The agency, one of the first county transit authorities to be established in Washington state, began operations on June 16, 1975, and is one of few in the state that are not governed as a public transportation benefit area.