Duke Humfrey's Library is the oldest reading room in the Bodleian Library at the University of Oxford. It functions primarily as a reading room for maps, music, and pre-1641 rare books. It consists of the original medieval section (1487), the Arts End (1612), and the Selden End (1637). It houses collections of maps, music, Western manuscripts, and theology and arts materials. It is the main reading room for researchers of codicology, bibliography, and local history. It is also the location of the University Archives and the Conservative Party Archive.
The library is on the first floor and forms an H-shape with the later parts as the uprights. Arts End is above the Proscholium and is attached at two corners to the Old Schools Quadrangle. The medieval section is above the Divinity School and Selden End (named after John Selden a benefactor of the library) is above the Convocation House. A drawing of the medieval section with Divinity School below in isolation is used as the emblem of the Bodleian Library.