St John's is a village in the north of Crowborough, in the Wealden district, in the county of East Sussex, England. It lies about from Crowborough town centre in the ecclesiastical parish of Withyham. In the 2021 Census, the electoral ward of Crowborough had a population of 3,135.
Archaeological investigations were undertaken north of the village church in 2026 to discover the locations of graves prior to building work. This resulted in the publication of an archaeological evaluation, and an archaeological Strip and Map.