Séon Carsuel (Anglicized: John Carswell, modern Scottish Gaelic: Seon Carsuail; c. 1522 – 1572) was a 16th-century Scottish prelate, humanist, and Protestant reformer. Born early in the century, when Carsuel completed his education he joined the service of the Protestant Earl of Argyll, tutoring his son and using his patronage to obtain benefices, most notably becoming Bishop of the Isles in 1565. Standing at over 7 feet (2.1 metres) in height, Carsuel was an important figure in the history of Scottish Gaelic, as in 1567 his Foirm na n-Urrnuidheadh, the Gaelic translation of the Book of Common Order, became the first work to be printed in any Goidelic language.