John Webster (1610–1682), also known as Johannes Hyphastes, was an English cleric, physician and chemist with occult interests, a proponent of astrology and a sceptic about witchcraft. He is known for controversial works.
Webster was born at Thornton in Craven in Yorkshire. He claimed education at the University of Cambridge. Although there is no evidence for this, his writing displays a learned style.
Webster studied under the Hungarian alchemist Johannes Huniades (János Bánfi-Hunyadi), who is known to have lectured at Gresham College.
Webster became a curate in Kildwick in 1634. He has been linked to Roger Brearley, the Grindletonian leader active at this period in Kildwick (three years earlier); and classified as an Antinomian. During the First English Civil War, Webster left his position as a teacher in Clitheroe and became a surgeon and army chaplain in the Parliamentarian forces. At a later point he was with the forces of Colonel Richard Shuttleworth. In 1648 he became vicar at Mitton. From a Grindeltonian convert, he moved closer to Quaker views. He has been called a Seeker.
Webster preached with William Erbery on 12 October 1653 in a dispute with two London ministers at All Hallows, Lombard Street. Disorder resulted after Erbery took a particularly aggressive line against the established clergy. Webster had preached at All Hallows in 1652.
In the late 1650s Webster was again in Clitheroe. In 1658 he was arrested and had papers seized. He gave up the ministry, and practiced as a physician. He died at Clitheroe