Demonic, daemonic or dæmonic may refer to:
- Demon, a supernatural malevolent entity
- Daemon, a lesser deity or guiding spirit such as the daimons of ancient Greek religion and mythology and of later Hellenistic religion and philosophy
- Demonic (album), a 1997 album by American thrash metal band Testament
- Demonic (2015 film), an American supernatural horror film
- Demonic (2021 film), a Canadian-American science fiction supernatural horror film
- Daemonic (novel), a 1995 horror novel by English writer Stephen Laws
- Demonic or Johannes Roberts' Demonic, the American title of the 2005 British supernatural horror film Forest of the Damned
