Hag (disambiguation)

A hag is a wizened old woman, or a fairy with the appearance of an old woman.

Hag may also refer to:
 * HAG, a Swiss model train company
 * Håg, in Scandinavian mythology
 * Hag (album), a 1971 album by Merle Haggard
 * Hag (Dungeons & Dragons), a class of fictional role playing monster
 * Hag and Mag, a pair of demons in Mandaeism
 * Hag and Troll, demonic super villains in the Marvel Comics Universe
 * Book of Haggai, a book of the Hebrew Bible
 * Café HAG, a brand of decaffeinated coffee
 * Hagley railway station, in England
 * Hag moth (Phobetron pithecium), a moth of the family
 * Hanga language, spoken in Ghana
 * High Assurance Guard, computer security device
 * Hoang Anh Gia Lai Group, a Vietnamese company
 * Jewish holidays (Hebrew: חג, ḥag)
 * Kari Hag (born 1941), Norwegian mathematician
 * Peat hag, erosion