Langdell Hall is the largest building on the campus of Harvard Law School in Cambridge, Massachusetts. It is home to the school's library, the largest academic law library in the world, and is named for pioneering law school dean Christopher Columbus Langdell. It is built in a modified neoclassical style.
The building was commissioned in 1905 by law school dean James Barr Ames, as the school was outgrowing H.H. Richardson's Austin Hall. It was designed by Richardson's successor, the firm Shepley, Rutan and Coolidge. The southern wing of the current building was completed and occupied by 1907. The same firm, rechristened Coolidge, Shepley, Bulfinch and Abbott, completed the northern and western wings in 1929. In 1997, the firm was appointed once again, this time to renovate the building. The renovations expanded the library, which now takes up most of the building, with the exception of two classrooms.
Other notable parts of the building include the Caspersen Room, which houses rare books, manuscripts, and paintings. The lobby of the building is graced by a statue of Joseph Story, Harvard professor and Supreme Court justice, sculpted by his son, William Wetmore Story.