The Association of European Research Libraries (Ligue des Bibliothèques Européennes de Recherche or LIBER) is a professional association of national and university research libraries in Europe.

It operates as a Dutch foundation, with headquarters in the Koninklijke Bibliotheek in The Hague.

[1] The origin of LIBER sprang from a 1968 meeting of the International Federation of Library Associations.

[1] LIBER held its first conference in Strasbourg in 1971, and continues meeting annually.

[3] The group also publishes an open access journal about librarianship, LIBER Quarterly.