Belgica: Bibliothèque numérique de la Bibliothèque royale de Belgique. Manuscripts collection.
British Library Catalogue of Illuminated Manuscripts. Complete catalog records and spectacular images which can be downloaded at a high resolution.
Digital Scriptorium: Medieval and Renaissance manuscripts from many institutions. Images may be used FREELY for educational purposes. For other uses, contact the contributing institution.
Medieval Illuminated Manuscripts. From the collection of the Koninklijke Bibliotheek and the Museum Meermanno-Westreenianum in The Hague.
Special Collections Resource Center at Syracuse University: Antiquarian Books. Includes rare printed books, medieval manuscripts, cuneiform tablets, and more.
Walters Art Museum Manuscripts and Rare Books Online.