Nightmare may refer to:
- Actual nightmares, for which we have several tropes listed under Dream Tropes (the most general of which are Past Experience Nightmare and Nightmare Sequence).
- Nightmare, a fanfic.
- Nightmare, a Slasher Movie released in 1981.
- Nightmares is a 1983 horror anthology film directed by Joseph Sargent.
- Nightmare, a horror RPG made in RPG Maker (and unrelated to the aforementioned movie).
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