Thomas Cantock (died 1309) was an Irish cleric and judge who held the offices of Bishop of Emly and Lord Chancellor of Ireland.
O'Flanagan, writing in 1870, complains that a biographer of Cantock is faced with an almost complete lack of information.[1] Not a great deal more is known today. He was English by birth, and may have been a relative of the Roger de Cantock who held the manor of Dyrham, Gloucestershire in 1347; the family had earlier connections with Bristol. He was sent by King Edward I on a mission to Scotland in 1288.[2] He was Lord Chancellor of Ireland from 1292–1294 and again from 1306–1308.He was elected Bishop of Emly in 1306. He is known to have acquired lands at Ballyfermot and Chapelizod in County Dublin. O'Flanagan states that from the little that is known of him he seems to have been popular and hospitable.[3]