The National Library of Greece is the largest library in Greece and one of the largest libraries in the Balkans. It was founded in 1829, shortly after Greece gained its independence from the Ottoman Empire. The library's main building is located in the center of Athens, near the Syntagma Square.

The National Library of Greece holds a vast collection of books, manuscripts, maps, and other documents, including rare and valuable items. The library's collection includes over 4.5 million books, over 1.2 million photographs, over 1.5 million maps, and over 500,000 rare manuscripts and documents. The library also holds a significant collection of Greek and foreign periodicals.

The library's collection is organized in several departments, including the General Collection, the Rare Books Collection, the Manuscript Collection, the Map Collection, the Periodicals Collection, and the Music Collection. The library also has a Reading Room, where visitors can access the library's collections and use the library's resources.

In addition to its collections, the National Library of Greece is also involved in various cultural and educational activities, including exhibitions, lectures, and conferences. The library also provides various services to the public, such as access to digital collections, interlibrary loans, and reference and research services.