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 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
- Hagberry (Prunus padus), a species of cherry
- Hagfish, jawless fish
- Hagigah, a rabbinic text
- Hagley railway station, in England
- Hag moth (Phobetron pithecium), a moth of the family
- Hanga language, spoken in Ghana
- High Assurance Guard, computer device used to communicate between different Security Domains
- Hoang Anh Gia Lai Group, a Vietnamese company
- Jewish holidays (Hebrew: חג, ḥag)
- Kari Hag (born 1941), Norwegian mathematician
- Peat hag, a type of peat erosion that occurs e.g. at the side of gullies
See also
- Hagg (disambiguation)
- Haga (disambiguation)
- Haig (disambiguation)
- Chag (disambiguation)
- Night hag (disambiguation)