Thomas Fastolf, sometimes spelt Fastolfe (died June 1361), was an English canon lawyer and Bishop of St David's from 1352 until his death. Probably educated at Cambridge and then overseas, he held the degree of Doctor of Laws and his first career was as a canon lawyer in Avignon, which was then the seat of the Papacy. He is credited as the first identifiable reporter of cases in the papal court known as the Rota. As Fastolf advanced in the service of the Avignon popes, he gained a series of preferments in the British Isles, concluding with the bishopric of St David's.