Ghast may refer to:
* See Underworld (Dreamlands) for Ghasts, a race of creatures in H. P. Lovecraft's Dreamlands
The ghasts are a race of fearsome humanoids. They are much larger than a man and have a vaguely human face, albeit missing a nose. Their skin is rough and knotty. Their senses are unusually acute; they can see in the dark and have a strong sense of smell. They hop about on a pair of hooved, kangaroo-like legs, and are swift, strong, and agile. Ghasts prefer to dwell in complete darkness and have no tolerance for natural light — sunlight will kill them instantly. Otherwise, the dim, pale glow of the underworld seems to cause them little harm.
The ghasts are aggressive carnivores and often hunt in packs, though they are quick to turn cannibalistic when no game is readily available. They prey mostly on the gugs, but have no qualms about eating other denizens of the underworld. Their method of attack is particularly savage and gruesome, rending and tearing apart their victims with their muzzles, paws, and hoofed feet.
* See Demons Three for Ghast, third member of a demonic trio in original Justice League of America comic book series
* Ghasts (Dungeons & Dragons) are a stronger breed of ghouls in the Dungeons and Dragons role-playing game
The ghast is similar to the ghoul, but is distinguished by its monstrously foul and supernaturally nauseating stench. It is also more powerful than a standard ghoul; even elves can fall victim to a ghast's paralytic touch. It resembles very closely its undead cousins, but is far more deadly and cunning. Like ghouls, ghasts speak whatever language they did in life (usually Common). They are chaotic evil in alignment.
* Creatures known as "cliff-ghasts" appear in the His Dark Materials trilogy