The National Library of Chile is the national library of Chile. It is located on the Avenida Libertador General Bernardo O'Higgins in Santiago, in a building completed in 1925, though its history reaches to the early nineteenth century before it was relocated to its current home.

A national library is a library established by a government as a country's preeminent repository of information. Unlike public libraries, these rarely allow citizens to borrow books. Often, they include numerous rare, valuable, or significant works. A national library is that library which has the duty of collecting and preserving the literature of the nation within and outside the country. Thus, national libraries are those libraries whose community is the nation at large. Examples include the British Library in London, and the Bibliothèque nationale de France in Paris.