Fictional entities and role-playing games

• Daemon (G.I. Joe)
• Dæmon (His Dark Materials)
• Daemon (Digimon)
• Demon (Dungeons & Dragons)
• Demon (Supernatural)
• Daemon, character in the TV series ReBoot
• Daemon Blackfyre, character in George R. R. Martin's A Song of Ice and Fire universe and its adaptations
• Daemon Targaryen, character in George R. R. Martin's A Song of Ice and Fire universe and its adaptations
• Demons (Shannara)
• Demon or dimension traveler, class of characters in the MythAdventures series
• Characters in the Artemis Fowl series
• Characters which appear in The Demonata by Darren Shan
• Azazel (Supernatural), fictional character also known as "The Demon"
• Etrigan the Demon
• Demons (Mayfair Games), a 1992 role-playing game supplement for demons in Advanced Dungeons & Dragons

Films

• The Demon (1918 film), an American silent comedy film
• The Demon (1926 film), an American silent Western film
• The Demon (1963 film), an Italian horror-drama film
• Demons, a 1971 Japanese film directed by Toshio Matsumoto
• Demon (1976 film) or God Told Me To, an American horror film
• The Demon (1978 film), a Japanese drama film
• The Demon (South African film), a slasher film
• Demons (1985 film), an Italian horror film
• Daemon (film), a 1985 British horror film
• Demon (2015 film), a Polish drama film
• Demons (2017 film), an American horror film
• Demon (2023 film), an Indian Tamil-language horror film

Publications

• Demon (comics), a comic by Jason Shiga
• The Demon, a DC Comics series starring Etrigan the Demon

Music

Books

• Daemon (novel), a 2009 novel by Daniel Suarez
• Demon (comics), a 2014–2016 comic series by Jason Shiga
• Demon (novel), a 1984 novel by John Varley
• Demon , a 2003 novel by Christopher Nicole
• Demon: A Memoir, a 2007 novel by Tosca Lee
• Demon and Other Tales , a 1996 collection by Joyce Carol Oates
• Demons (Dostoevsky novel), an 1872 novel by Fyodor Dostoevsky
• Demons (Dillard novel), a 1986 Star Trek: The Original Series novel by J.M. Dillard
• Demons , a 1987 novel by Guy N. Smith
• Demons , a 1993 novel by Bill Pronzini
• Demons , a 2000 novella by John Shirley
• Demons! , a 1987 anthology edited by Jack Dann and Gardner Dozois
• The Daemon, a 1977 novel by Peter Tuesday Hughes
• The Demon, a 1976 book by Eve Bunting
• The Demon (novel), a 1976 novel by Hubert Selby Jr.
• The Demon , a 2003–2004 two-part Star Trek novel by Loren L. Coleman and Randall L. Bills; the 35th and 36th installment in the Corps of Engineers series
• The Demons , reissue title of Demons' World, a 1964 novel by Kenneth Bulmer

Television

Religion

• Unclean spirit, an agent of a demonic possession

Philosophy

• Demon (thought experiment), a class of hypotheses
  • Laplace's demon (1814), articulation of causal or scientific determinism by Pierre-Simon Laplace
  • Maxwell's demon, a concept by James Clerk Maxwell concerning the statistics of second law of thermodynamics
  • Evil demon, a philosophical concept originating with René Descartes
  • Darwinian Demon, a hypothetical organism resulting from absence of biological constraints on evolution

Mythology

• Daemon (classical mythology), a lesser deity or guiding spirit in ancient Greek religion and mythology

Basketball

• DePaul Blue Demons men's basketball, Chicago, Illinois
• Wake Forest Demon Deacons men's basketball, North Carolina
• Northwestern State Demons basketball, Natchitoches, Louisiana
• Northwestern State Lady Demons basketball, Natchitoches, Louisiana
• UCC Demons, Irish basketball team

Football and rugby

• Cardiff Demons, a Welsh rugby league team
• Casey Demons, an Australian rules football team
• Melbourne Football Club, an Australian rules football team nicknamed the Demons
• Northwestern State Demons football, Natchitoches, Louisiana
• Perth Football Club, an Australian rules football team nicknamed the Demons