John Harewell was a Bishop of Bath and Wells in medieval England. Harewell came from Harwell in Berkshire (now in Oxfordshire). He was in the employ of the Black Prince, before being collated Archdeacon of Berkshire in 1365 and then selected, on 14 December 1366, as Bishop of Bath and Wells. He was consecrated on 7 March 1367 and died around 16 July 1386. His executors are listed as John Harewell; John Bryngton; John Grene, of Welles, canon; John de Tuttebury, in 1399 (1 Henry IV).