Andrew Louth

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. Louth has been at Durham University since 1996. Previously he taught at the University of Oxford (mostly patristics) and at Goldsmiths' College in Byzantine and early medieval history. He is a fellow of the British Academy and was a member of the British Academy Council from 2011 to 2014. He was President of the Ecclesiastical History Society (2009–10).

Born on 11 November 1944 in Louth, Lincolnshire, he was educated at the universities of Cambridge and Edinburgh. His former students include Romanian theologian and politician Mihail Neamțu. On the theology of Dumitru Stăniloae (1903–1993), Louth takes a position similar to Neamțu, stating that Stăniloae's apologetics was shaped by confessional bias and rhetorical clichés.

Formerly an Anglican priest, he converted to Eastern Orthodoxy in 1989 and was ordained as an Eastern Orthodox priest in 2003.