The New York Public Library (NYPL) is one of the largest public library systems in the world and the second-largest public library in the United States after the Library of Congress. It serves New York City—specifically the Bronx, Manhattan, and Staten Island (distinct from the Brooklyn Public Library and Queens Public Library)—with a vast collection of nearly 53 million items, including books, periodicals, maps, and digital resources. The NYPL operates 92 locations, comprising four major research libraries and 88 branch libraries, and functions as a private, non-governmental, independently managed nonprofit 501(c)(3) organization funded through a combination of private donations, endowments, and public financing from the City of New York.

Its flagship Stephen A. Schwarzman Building on Fifth Avenue and 42nd Street—a Beaux-Arts landmark often called the 'main branch'—houses the humanities and social sciences research collections (approximately 44 million items) and iconic features like the Rose Main Reading Room and the marble lions, Patience and Fortitude. The system also includes specialized facilities such as the Science, Industry and Business Library (SIBL) and the Schomburg Center for Research in Black Culture. Recent developments include the renovation of the Stephen A. Schwarzman Building and the opening of the Stavros Niarchos Foundation Library (SNFL), a state-of-the-art circulating branch funded by major philanthropic gifts.

The NYPL plays a crucial role in education, research, and community engagement, offering free access to knowledge, extensive collections, online classes, events, e-books, educational programs, and specialized services that inspire lifelong learning and advance cultural preservation. While generally celebrated for its public service, the institution has faced occasional controversies, such as a 2023 incident involving vandalism by pro-Palestinian protesters. Overall, the NYPL remains a cornerstone of New York City's intellectual and cultural landscape, promoting accessibility to information and fostering community strength.