The U.S. Post Office in San Pedro, California, is a historic Streamline Moderne post office built in 1936. Designed by supervising architect Louis A. Simon with architects Gordon Kaufmann and W. Horace Austin, the San Pedro Post Office was listed in the National Register of Historic Places in 1985. The building also formerly served as a U.S. Customs Office. The building's use of marble, bronze and milk glass are typical of 1930s architecture for U.S. government buildings.