Golden Gate Transit (GGT) is a public transportation system serving the North Bay region of the San Francisco Bay Area in California, United States. It primarily serves Marin and Sonoma counties, and also provides limited service to San Francisco and Contra Costa County.
Golden Gate Transit is one of three transportation systems owned and operated by the Golden Gate Bridge, Highway and Transportation District; the others are the Golden Gate Bridge and Golden Gate Ferry, both of which connect San Francisco and Marin County. Funding for cross-bridge "Transbay" bus service is partially subsidized by Golden Gate Bridge tolls, in addition to the traditional federal and state sources. GGT provides some bus service within Marin County under contract with Marin Transit.