The manuscript collection of more than 7,000 volumes, more than 14,000 original legal documents, and 500 rolls, formed by Robert Harley (1661–1724), and his son Edward Harley (1689-1741). In 1753, it was purchased for £10,000 by the British government and together with the collections of Robert Bruce Cotton (1571–1631), and Hans Sloane were formed the basis of the British Museum library (after 1973 British Library).
- Lacnunga (Harley 585)
- Inventory of Henry VIII of England (Harley 1419)
- Minuscule 113 (Harley 1810)
- Harley Lyrics (Harley 2253)
- Harley Golden Gospels (Harley 2788)
- Book of Nunnaminster (Harley 2965)
- Minuscule 3686
- Harleian Genealogies (Harley 3859)
- Minuscule 104 (Harley 5537)
- Minuscule 505 (Harley 5538)
- Harley MS. 7334
- Harleian prayerbook (Harley 7653)
- History of the Harley Library at the British Library
- British Library Journal vol. 15 (1989) is devoted to Robert Harley and his collections.
- C. E. and C. R. Wright, eds. The Diary of Humfrey Wanley 1715–1726, 2 vols (London, 1966).
- The foundation collections at the Catalogue of Illuminated manuscripts
- List medicine and alchemist manuscripts PDF, 192 KB
- Trilinguical Psalter
- Harley Bestiary (Harley 4751)
- The Book of Nunnaminster (Harley 2965)