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v t e Librarians of Congress
John J. Beckley (1802–1807) Patrick Magruder (1807–1815) George Watterston (1815–1829) John Silva Meehan (1829–1861) John Gould Stephenson (1861–1864) Ainsworth Rand Spofford (1864–1897) John Russell Young (1897–1899) Herbert Putnam (1899–1939) Archibald MacLeish (1939–1944) Luther H. Evans (1945–1953) Lawrence Quincy Mumford (1954–1974) Daniel J. Boorstin (1975–1987) James H. Billington (1987–2015) David S. Mao* (2015) Carla Hayden (2016–present)
Acting librarian*

v t e United States national libraries
Department of Agriculture: National Agricultural Library Congress: Library of Congress Department of Transportation: National Transportation Library Department of Health and Human Services / National Institutes of Health: National Library of Medicine Department of Education: National Library of Education
Other related libraries and services Law Library of Congress National Archives and Records Administration (NARA) Federal Depository Library Program Presidential library system List of U.S. state libraries and archives

Library of Congress