In religions worldwide, any of various evil spirits that mediate between the supernatural and human realms. The term comes from the Greek word daimon, a divine or semidivine power that determined a person's fate. Zoroastrianism had a hierarchy of demons, which were in constant battle with Ahura Mazda. In Judaism it was believed that demons inhabited desert wastes, ruins, and graves and inflicted physical and spiritual disorders on humankind. Christianity placed Satan or Beelzebub at the head of the ranks of demons, and Islam designated Iblis or Satan as the leader of a host of evil jinn. Hinduism has many demons, called asuras, who oppose the devas (gods). In Buddhism demons are seen as tempters who prevent the achievement of nirvana.

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For more possible meanings see Demon (disambiguation) and Daimon (alternate spelling)

• Daemon (mythology) - See also: Agathodaemon, Cacodemon, Demon

In literature:

• Daemon (novel), a novel by Leinad Zeraus;
• Dæmon (His Dark Materials) in the Philip Pullman trilogy of novels His Dark Materials

In computers and software:

• Daemon (computer software), a background process
• Daemon Tools, a popular disk image emulator
• The BSD Daemon is the BSD operating system's mascot.
• Mailer-Daemon, email server software responsible for message delivery.

In games:

• Daemon (Dungeons & Dragons) is the original name for creatures now called "Yugoloths" in the game Dungeons & Dragons
• Daemon (Warhammer)
• Daemon (Warcraft)
• ZDaemon, a modern version of the game Doom

In film, music and media:

• The Dæmons is a serial in the British science fiction television series Doctor Who
• Daemon (Digimon) an evil digimon from Digimon
• Daemon is a character in the TV series ReBoot.
• Daemon is a Swedish death metal band.
• Daemon Records, a record label