The Pacific-Union Club is a social club located at 1000 California Street in San Francisco, California, at the top of Nob Hill. It was founded in 1889 as a merger of two earlier clubs: the Pacific Club (founded 1852) and the Union Club (founded 1854). The clubhouse was built as the home for the silver magnate James Clair Flood. The former Flood Mansion is located in the Nob Hill neighborhood. It was designed by Willis Polk. It is considered the first brownstone constructed west of the Mississippi River. Along with the Fairmont Hotel across the street, it was the only structure in the area to survive the San Francisco earthquake and fire of 1906.
This club figured prominently in the history of the west coast of the United States. Many prominent citizens have been active among its membership.
- Caspar Weinberger, Secretary of Defense
- John Barneson, Founder General Petroleum Corporation, General Pipe Line Company
- R.A.F. Penrose, Jr., Prominent Geologist
- Samuel F. B. Morse
- Robert McNamara, Secretary of Defense
- Randolph Apperson Hearst
- Tirey L. Ford, California Attorney General
- William Randolph Hearst, Jr.
- William Randolph Hearst III
- William S. Mailliard
- William Henry Draper III, Businessman
- Benjamin Dillingham
- Charles R. Schwab, Founder, Charles Schwab Corporation
- William Redington Hewlett, Co-founder Hewlett Packard
- David Packard, Co-founder Hewlett Packard and former U.S. Deputy Secretary of Defense
- Warren A. Bechtel, Founder Bechtel Corporation
- Stephen Bechtel, Jr., Former CEO Bechtel Corporation
- Riley P. Bechtel, CEO Bechtel Corporation
- Walter A. Haas, Jr., CEO (1958-1976) and chairman (1970-1981) of Levi Strauss & Co
- Henry J. Kaiser, Engineer and founder of Kaiser Family Foundation
- Paul B. Fay, Former Undersecretary of the Navy and PT-109 crewmate of John F. Kennedy.
- Benjamin Biaggini, Former President and CEO, Southern Pacific Railroad
- William Lane Booker, British diplomat.
- Donald J. Russell, Former President, Southern Pacific Railroad
- Henry F. Grady, First US Ambassador to India; Dean of the Commerce department at the University of California, Berkeley; President of American President Lines