Roger of Seaton (1230 1280) was a British justice. He studied canon law at Oxford University, and by 1258 he was a qualified magister, a rarity for British justices of the time; of the sixty or so justices who had served under Richard I only three held such a title, with ninety and eight respectively for those who had served under John of England. By 1260 he was using his knowledge of Canon law as the commissary-general for Walter of Kirkham, the Bishop of Durham, as well as his immediate successor, Robert Stitchill, serving as one of his chancellors and also his executor.In 1268 he switched from an ecclesiastical career to a judicial one, and was appointed as a justice with the Court of Common Pleas. He left the court in 1271 to lead an Eyre circuit that travelled through south-eastern and eastern England, although the circuit was brought to an end in 1272 by the death of Henry III.