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The library is a single large room built over an open colonnade on the ground floor of Nevile's Court. The floor of the library proper within the upper storey lies several feet below the external division between the two storeys, reconciling the demands of use with the harmony of architectural proportion. It is credited as being one of the first libraries to be built with large windows to give comfortable light levels to aid readers.
The book stacks are arranged in rows perpendicular to the walls under the intervals between the windows. At the end of each stack is a fine limewood carving by Grinling Gibbons, and above these are plaster cast busts of notable writers through the ages. Other marble busts standing on plinths depict notable member of the college and are mostly carved by Louis-François Roubiliac. A later addition is a full size statue of Lord Byron carved by Bertel Thorvaldsen, originally offered to Westminster Abbey for inclusion in Poets' Corner, but refused due to the poet's reputation for immorality.
As part of the complex of buildings surrounding Nevile's Court, Great Court and New Court, the library is a Grade I listed building.
The library contains many notable rare books and manuscripts, many bequeathed by past members of the college.
Included in the collection are
- Isaac Newton's first edition copy of Philosophiae Naturalis Principia Mathematica with handwritten notes for the second edition.
- Isaac Newton's (1659–61) Notebook 
- An eighth-century copy of the Epistles of St Paul 
- About 1250 medieval manuscripts including the great 12th-century Eadwine Psalter from Christ Church, Canterbury, the 13th-century Anglo-Norman Trinity Apocalypse and the 15th-century Trinity Carol Roll.
- A. A. Milne's manuscript of Winnie-the-Pooh and The House at Pooh Corner.
- The Capell collection of early Shakespeare editions
- A collection of autograph poems by John Milton
- A 14th-century manuscript of The Vision of Piers Plowman 
- Several works printed by William Caxton, including the first book printed in English and the first dated printed book produced in England
- Several notebooks written by Ludwig Wittgenstein
- Handwritten notes by Robert Oppenheimer describing the "Trinity" atomic bomb test in New Mexico, U.S.
- Ramanujan's "lost notebook"
- 1620 edition of William Morgan's translation of the bible into Welsh
In early 2014 the library began a major programme of digitisation. To date, over 160 of the 1250 medieval manuscripts owned by the College have been digitised and are freely available to read online. A link to the list of digitised manuscripts can be found in the external links below.
- The Making of the Wren Library: Trinity College, Cambridge
- Fürst, V., 1956, The architecture of Sir Christopher Wren
- "Name: Trinity College, the Buildings Surrounding Great Court, Nevile's Court and New Court, and Including King's Hostel List entry Number: 1106371". Historic England. Retrieved 30 March 2015.
- Newton, Isaac. "Philosophiæ Naturalis Principia Mathematica (Newton's personally annotated 1st edition)".
- Isaac Newton's Notebook
- Pauline epistles Epistles of St Paul
- 13th-century Anglo-Norman Trinity Apocalypse
- The Western manuscripts in the library of Trinity College, Cambridge by M.R. James, Cambridge University Press, 1900, 3 vols.
- Frommer's London 2013 By Donald Strachan
- Autograph of Milton
- The Vision of Piers Plowman Online Manuscript
- Online Catalogue of the James Manuscripts
- Archives made easy Information
- Visit Cambridge Information
- Wren Library Opening Times
- Trinity College pages for the Wren Library
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- The online catalogue of digitised manuscripts in the Wren Library.
- Trinity College one of "The 20 Most Spellbinding University Libraries In The World" Independent Newspaper