The Pacific-Union Club is a social club located at 1000 California Street in San Francisco, California, at the top of Nob Hill. It is considered to be the most elite club of the West Coast, and one of the most elite clubs in the United States, along with the Knickerbocker Club in New York, the Metropolitan Club in Washington D.C., and the Somerset Club in Boston.

California Street is a major thoroughfare in San Francisco, California. It is one of the longest streets in San Francisco, and includes a number of important landmarks. It runs in an approximately straight 5.2 mi (8.4 km) east–west line from the Financial District to Lincoln Park in the far northwest corner of the city.