Castro is the name of the original owner of Yerba Buena Island, San Francisco Bay.
Castro (No. 621), a ferryboat launch, was constructed by the Mare Island Navy Yard in 1904. Commissioned in 1907, she was attached to the Naval Training Station, Yerba Buena, Calif., employed as a ferry between the Receiving Station and the docks at San Francisco until decommissioned on 15 August 1923. Castro was stricken from the Naval Register on 1 November 1926 and later sold.