A Red-footed Booby (Sula sula) visited Southeast Farallon Island, 43 km west of San Francisco, California, on 26 August 1975. A second individual visited the same locality on 12 October 1975. These are the first reported occurrences of the species in the western continental United States. The other mainland United States records have been in Florida, Texas, and Louisiana (Woolfenden 1965, Palmer 1962).