The 1928 United States Senate election in California was held on November 6, 1928. Incumbent Republican Senator Hiram Johnson was re-elected to his third term in office. He defeated Democrat Minor Moore and Prohibition Party nominee Los Angeles City Councilman Charles H. Randall.
Primaries were held on August 28.
Judge Minor Moore was unopposed on the ballot, but some primary voters wrote in Hiram Johnson or Charles Randall.