Nightmare is the name of two different songs in the Castlevania series:
- Castlevania III: Dracula's Curse - Composed by Konami Kukeiha Club. It appears in the Subterranean Tunnel stage. An arranged version appeared later in Castlevania: Circle of the Moon as the background theme for the Underground Waterway.
- Castlevania: Lament of Innocence - Composed by Michiru Yamane. It plays in the "Nightmare" area.