A Demonologist is an infernalist that studies demons and demonic powers as an academic pursuit. The term is common parlance among several supernatural groups.

Known groups that endorse demonology (and often saction demonolatry or diabolism) are the Order of Moloch among the Baali, elements among the Sabbat, the Josians of the Camarilla and the True Black Hand, most organizations among Mages (in particular the Celestial Chorus, the Dreamspeakers, the Order of Hermes, the Wu Lung, the Hollow Ones, the Void Engineers and the Circle of Red), Kuei-jin of the Devil-Tiger Dharma, the Arcanum and the Red Order.