This catalogue describes MSS 1-247 and 298 in the Chapter Library of Lincoln Cathedral, plus ten former Lincoln MSS now elsewhere. About half of the MSS were part of the cathedral's medieval Library; nearly all the rest came there before the late seventeenth century. Among the MSS, which date from the eighth to the early sixteenth century, are biblical commentaries and sermons, works of pastoral theology and an important corpus of Middle English texts, including the famous Thornton Romances. A group of MSS written at the Cathedral c.1100 is notable for its distinctive decoration. The Catalogue is preceded by a history of the Cathedral Library, based on the rich documentary evidence, which includes two medieval catalogues. The plates illustrate bindings, ownership marks, important decoration and noteworthy script, including samples from all signed and dated books.