Martynas Mažvydas National Library of Lithuania

Martynas Mažvydas National Library of Lithuania (Lithuanian: Lietuvos nacionalinė Martyno Mažvydo biblioteka) is a national cultural institution which collects, organizes and preserves Lithuania’s written cultural heritage content, develops the collection of Lithuanian and foreign documents relevant to research, educational and cultural needs of Lithuania, and provides library information services to the public.

More information on the English and Lithuanian  Wikipedia pages.

The website, in Lithuanian, is.