Eryl Stephen Thomas (20 October 1910 – December 2001) was a Welsh Anglican clergyman who served as Bishop of Monmouth and Bishop of Llandaff. An Anglesey man, after education at St John's College, Oxford, Eryl Thomas served curacies in the Diocese of St Asaph before being appointed to a parish (Risca) in South Wales then as Warden of St Michael's College, Llandaff. He was appointed Dean of Llandaff in 1954, and in this post completed the restoration of the war-damaged cathedral begun under his predecessor Glyn Simon.