Christopher A. Haigh FRHistS (born 28 August 1944) is a British historian specialising in religion and politics around the English Reformation. Until his retirement in 2009, he was Student and Tutor in Modern History at Christ Church, Oxford and University Lecturer at Oxford University. He was educated at Churchill College, Cambridge and the Victoria University of Manchester. Haigh was a very influential revisionist in Tudor historiography and on the English Reformation. Haigh's writings mostly demonstrated that, contrary to orthodox understandings of the English Reformation, religious reform was extremely complex and varied considerably at a parish level. Haigh has also been noted for his work in diminishing the significance attributed to anticlericalism prior to 1530. His revisionism formed part of a broader wave in Tudor historiography with other historians such as Eamon Duffy and also formed the basis for the theory of the long reformation.

Haigh is married to fellow historian Alison Wall.