The National Library of Ireland is Ireland's national library located in Dublin, in a building designed by Thomas Newenham Deane. The mission of the National Library of Ireland is "To collect, preserve, promote and make accessible the documentary and intellectual record of the life of Ireland and to contribute to the provision of access to the larger universe of recorded knowledge."

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.