|Country||United States of America|
|Established||28 February 1942|
|Branch of||Harvard University Library|
Houghton Library, on the south side of Harvard Yard adjacent to Widener Library, is Harvard University's primary repository for rare books and manuscripts. It is part of the Harvard College Library, the library system of Harvard's Faculty of Arts and Sciences.
Harvard's first special collections library began as the Treasure Room of Gore Hall in 1908. The Treasure Room moved to the newly-built Widener Library in 1915. In 1938, looking to supply Harvard's most valuable holdings with more space and improved storage conditions, Harvard College Librarian Keyes DeWitt Metcalf made a series of proposals which eventually led to the creation of Houghton Library, Lamont Library, and the New England Deposit Library. Funding for Houghton was raised privately, with the largest portion coming from Arthur A. Houghton Jr., in the form of stock in Corning Glass Works. Construction was largely completed by the fall of 1941, and the library opened on February 28, 1942.
Along with much else, Houghton holds collections of papers of Samuel Johnson, Emily Dickinson, Henry Wadsworth Longfellow, Margaret Fuller, John Keats, Ralph Waldo Emerson and his family, Amos Bronson Alcott and his daughter Louisa May Alcott, along with the papers of other notable transcendentalists, Theodore Roosevelt, T.S. Eliot, E.E. Cummings, Henry James, William James, James Joyce, John Updike, Jamaica Kincaid, Gore Vidal, and many others.
Houghton has five main curatorial departments: