John Alcock (11 April 1715, London – 23 February 1806) was an English organist and composer. He wrote instrumental music, glees and much church music.He was a pupil of John Stanley at St. Paul's Cathedral, and he earned a doctorate in music at the University of Oxford in 1766. Much detail of his life is included in his semi-autobiographical novel, The Life Of Miss Fanny Brown published under the pseudonym John Piper in 1771. He also held a position as private organist to the Earl of Donegall.