Gaap (also Tap, Coap, Taob, Goap) is a demon that is described in demonological grimoires such as the Lesser Key of Solomon, Johann Weyer's Pseudomonarchia Daemonum, and the Munich Manual of Demonic Magic, as well as Jacques Collin de Plancy's Dictionnaire Infernal,
These works describe Gaap as a prince in human form who incites love. The Munich Manual also says that "Taob" also provides medical care for women, transforms them to make it easier to get to a lover, renders them infertile, and rules twenty-five legions of spirits. The other sources instead describe Gaap as a president, giving him the power to teach philosophy and liberal arts, make others invisible, steal familiars from other magicians, make men stupid, and carry men between kingdoms; in addition to ruling sixty-six legions of demons. Johann Weyer also connects Gaap to necromancers, and states that he was first called upon by Noah's son Ham, along with Beleth. He was of the order of potestates.
Gaap (or Goap) is also one of the four cardinal spirits, of the south in the Lesser Key of Solomon, the west in the Pseudomonarchia Daemonum.
- Amaymon is also one of the four cardinal spirits, of the east in the Lesser Key of Solomon.
- Ziminiar is also one of the four cardinal spirits, of the north in the Lesser Key of Solomon.
- Corson is also one of the four cardinal spirits, of the west in the Lesser Key of Solomon.
- Lemegeton Clavicula Salomonis: The Lesser Key of Solomon, Detailing the Ceremonial Art of Commanding Spirits Both Good and Evil; ed. Joseph H. Peterson; Weiser Books, Maine; 2001. p.18-22
- Pseudomonarchia Daemonum (Liber officiorum spirituum); Johann Weyer, ed. Joseph Peterson; 2000. Available online at Esoteric Archives par 30-39
- Forbidden Rites: A Necromancer's Manual of the Fifteenth Century; Richard Kieckhefer; Pennsylvania State University Press, University Park, PA; 1997. P. 165-167 and 291-293
- The Goetia of Dr Rudd; Thomas Rudd, Ed. Stephen Skinner & David Rankine; 2007, Golden Hoard Press. p.34
- Introduction by Joseph Peterson to Pseudomonarchia Daemonum (Liber officiorum spirituum); Johann Weyer, ed. Joseph Peterson; 2000. Available online at Esoteric Archives
- Dictionnaire infernal: ou Répertoire universel des êtres, des personnages, Jacques Collin de Plancy, 1853, available on Google Books. p.460-469
- "Les who's who démonologiques de la Renaissance et leurs ancêtres médiévaux" by Jean-Patrice Boudet, Médiévales 44, Spring 2003, (online link). pars. 25, 28, 56
- The Book of Solomon's Magick by Carroll Runyon, C.H.S. Inc, 1996, p.160
- Rudd, ed. Skinner & Rankine, p.366-376