Andrew Louth FBA (/laʊθ/; born 11 November 1944) is an English theologian.

He is an emeritus professor of patristic and Byzantine studies in the Department of Theology and Religion of Durham University.

Previously he taught at the University of Oxford (mostly patristics) and at Goldsmiths' College in Byzantine and early medieval history.

[2][3] He was President of the Ecclesiastical History Society (2009–10).

[4] Born on 11 November 1944 in Louth, Lincolnshire, he was educated at the universities of Cambridge and Edinburgh.