The Philadelphians, or the Philadelphian Society, were a Protestant 17th century religious group in England. They were organized around John Pordage (1607–1681), an Anglican priest from Bradfield, Berkshire, who had been ejected from his parish in 1655 because of differing views, but then reinstated in 1660 during the English Restoration. Pordage was attracted to the ideas of Jakob Böhme, a Lutheran theosophist and Christian mystic.
A group of followers came to Pordage, led by Mrs. Jane Leade (1624–1704), who experienced a number of visions and later published them in her book A Fountain of Gardens. The group incorporated as The Philadelphian Society for the Advancement of Piety and Divine Philosophy in 1694 (their name was inspired by the Philadelphians mentioned in the Book of Revelation.) They rejected the idea of being a church, preferring the term society, and none of the members ceased their memberships in existing churches. Together, the group held views that were somewhat similar to Panentheism, regarding the belief in the presence of God in all things, and with a Nondualist component, in that they also believed the presence of the Holy Spirit exists in each and everyone's soul, and that one can become enlightened and illuminated by living a virtuous life and seeking truth through the wisdom of God.