The Hoover Institution on War, Revolution, and Peace is a conservative American public policy institution and research institution that promotes personal and economic liberty, free enterprise, and limited government. Located in Stanford, California, on the campus of Stanford University, it began as a library founded in 1919 by Stanford alumnus Herbert Hoover, before he became President of the United States. The library, known as the Hoover Institution Library and Archives, houses multiple archives related to Hoover, World War I, World War II, and other world-historical events.
The Hoover Institution has been a place of scholarship for individuals who previously held high-profile positions in government, such as George Shultz, Condoleezza Rice, Michael Boskin, Edward Lazear, John B. Taylor, Edwin Meese, and Amy Zegart—all Hoover Institution fellows. In 2007, retired U.S. Army General John P. Abizaid, former commander of the U.S. Central Command, was named the Institution's first annual Annenberg Distinguished Visiting Fellow. Former Secretary of Defense General James Mattis served as a research fellow at Hoover before being appointed by the Trump administration.
Hoover was ranked as the tenth most influential think tank in the world in 2020 by Academic Influence, and the 22nd of the "Top Think Tanks in the United States" by the Global Go To Think Tank Index Report in 2019 (Think Tanks and Civil Societies Program, University of Pennsylvania).
While the Hoover Institution is formally a unit of Stanford University, it has its own board of overseers and less than 2% of its funding come from the university; instead it relies on its own endowment income and gifts.