The New York Public Library (NYPL) is one of the leading public libraries of the world and is one of the five most important libraries in the United States.

The Humanities and Social Science Library of New York Public Library, more widely known as the library system's "Main Branch" or simply as New York Public Library, is the flagship building in the system and a prominent historic landmark in Midtown Manhattan. The branch, opened in 1911, is one of four research libraries in the library system.

The famous main reading room of the library (Room 315) is a majestic 78 feet (23.8 m) wide by 297 feet (90.5 m) long, with 52 feet (15.8 m) high ceilings. The room is lined with thousands of reference works on open shelves along the floor level and along the balcony, lit by massive windows and grand chandeliers, and furnished with sturdy wood tables, comfortable chairs, and brass lamps.