At this time, the library was enriched with significant donations and with rare foreign language books from all over Europe.

Among the library's holdings are a codex of the four Gospels attributed to the scribe Matthew; uncial codex with a fragment Gospel of Matthew from 6th century (Uncial 094), Flora Graeca Sibthorpiana by English botanist John Sibthorp; Charta of Greece by Rigas Velestinlis; The Large Etymological Dictionary, a historic Byzantine dictionary; and the first publication of Homer's epics and hymns.

The NLG also has over 4,000 works of art, approximately one million archival documents from public and private collections, 10,000 posters, maps, papyri, musical scores, and microfilms.

Although it will continue to house some of its current functions, the bulk of the library in 2018 was relocated to a new 22,000-square meter building at the Stavros Niarchos Foundation Cultural Center on the Phaleron Bay "Delta".

The twin buildings are integrated within a landscaped park with indigenous Mediterranean flora, and feature extensive renewable energy facilities and a central plaza around a 30-m wide seawater channel.

[12] AGLIS was founded in 1968 and represents Greek librarians to the International Federation of Library Associations and Institutions (IFLA).

[14] in Spring 2021, AGLIS partnered with the Heritage Management Organization (HMO) to enhance its ability to meet the needs of Greek Libraries and their patrons.

[15] Main Location: Stavros Niarchos Foundataion Cultural Center Syggrou Avenue 364, 17674, Kallithea Historic Vallianeio Building Panepistimiou Str.