A nightmare is a frightening dream. Nightmare may also refer to:
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Art
- The Nightmare, a painting by Henry Fuseli
Comics
- Nightmare (Marvel Comics), a demon
- Nightmare (Harvey Comics), a horse and a friend of Casper the Friendly Ghost
- Nightmare, a horror comic from Skywald Publications
Games
- Nightmare (game), a board game
- Nightmare LPMud, an online role-playing game
- Nightmare (Dungeons & Dragons), a demonic creature in the form of a fire-breathing horse
- Nightmare (Kirby), the final villain of Kirby's Adventure
- Nightmare (Soul Calibur), the alter ego of Soul Blade character Siegfried Schtauffen
- A type of monster in the game Pathways into Darkness
Film
- Nightmare (1956 film), a psychological thriller starring Edward G. Robinson
- Nightmare (1964 film), a suspense film from Hammer Films
- Nightmares (1983 film), a horror film starring Emilio Estevez
- Nightmare (Gami), a Korean horror film starring Ji Won
Television
- "Nightmare" (1963 The Outer Limits), an episode of the original The Outer Limits television series
- "Nightmare" (1998 The Outer Limits), an episode of the revived "The Outer Limits" television series
- "Nightmares" (Buffy episode), an episode of Buffy the Vampire Slayer
- Knightmare, a children's television program
- Knightmare Frame, a group of giant robots in the anime series Code Geass
People
- Vanes Martirosyan, a boxer
Music
- Nightmare (band), a Japanese rock band
- Nightmare Recordings, a record label
- A song by Brainbug


