Sir John Rhŷs, was a Welsh scholar, fellow of the British Academy, Celticist and the first professor of Celtic at Oxford University.

Celtic studies or Celtology is the academic discipline occupied with the study of any sort of cultural output relating to the Celtic-speaking peoples. This ranges from linguistics, literature and art history, archaeology and history, the focus lying on the study of the various Celtic languages, living and extinct. The primary areas of focus are the six Celtic languages currently in use: Irish, Scottish Gaelic, Manx, Welsh, Cornish, and Breton.