Andrew D. Chumbley (September 15, 1967-September 15, 2004) was an English practitioner and theorist of magic, and a writer, poet and artist. He was Magister of the UK-based magical group Cultus Sabbati. He died on his thirty-seventh birthday following a severe asthma attack. After his death, "his book values at second hand resale, which were already quite high, increased in an exponential and quite insane fashion within hours of his death becoming known."