William Frend (22 November 1757 – 21 February 1841) was an English clergyman (later Unitarian), social reformer and writer. After a high-profile university trial in Cambridge, which deprived him of his residency rights as fellow of his college, he became a leading figure in London radical circles.
He was born on 22 November 1757 at Canterbury, the second son of George Frend, a tradesmen, alderman, and twice its mayor. His mother was buried in the cloister yard on 7 February 1763, and his father married at the cathedral, on 25 September 1764, Jane Kirby. Frend was educated at The King's School until 1771; among his companions were his cousin Herbert Marsh, and Charles Abbott. His father intended him for business, and he was sent to Saint-Omer in the Pas-de-Calais to learn French, and then to a mercantile house (trading company) in Quebec, where he remained for a few weeks. During his time there he served as a volunteer at the beginning of the troubles with the American colonies.
On his return home Frend expressed a wish to train for the ministry within the Church of England, and on the recommendation of Archbishop of Canterbury John Moore he entered Christ's College, Cambridge, on 18 December 1775, where William Paley was one of the college tutors. After gaining various college prizes he took the degree of B.A. in 1780, being second wrangler and winning Smith's Prize. Having gained the notice of Lynford Caryl, Master of Jesus College, he migrated there, becoming a Fellow and tutor in 1781.