Kenneth Grant (23 May 1924 – 15 January 2011) was an English ceremonial magician, novelist, and advocate of the Thelemic religion. A poet, novelist, and writer, he founded his own Thelemic organisation, the Typhonian Ordo Templi Orientis, later renamed the Typhonian Order—with his wife Steffi Grant.
Born in Ilford, Essex, Grant developed an interest in occultism and Eastern religions during his teenage years. After service with the British Army during the Second World War, he returned to Britain and became the personal secretary of Aleister Crowley, the ceremonial magician who had founded Thelema in 1904. Crowley instructed Grant in his esoteric practices and initiated him into his own occult order, Ordo Templi Orientis (O.T.O.). When Crowley died in 1947, Grant was seen as his heir apparent in Great Britain, and was appointed as such by the American head of O.T.O., Karl Germer. In 1949, Grant befriended the occult artist Austin Osman Spare, and in ensuing years helped to publicise Spare's artwork through a series of publications.