Nightmare (disambiguation)

Nightmare may refer to:
 * Nightmare, a song by mokemoke featuring Kagamine Rin.
 * Nightmare, a song by Tsuyoposo featuring Aoki Lapis.
 * NIGHTMARE, a demo song for GUMI V3 Power.
 * Nightmare Carnival, a song by Keidasshu featuring Hatsune Miku.
 * Nightmare of Halloween, a song by mayuko featuring multiple VOCALOIDs.
 * Nightmare Kitty, a song by Kimuta featuring Hatsune Miku and Megurine Luka.
 * Nightmare parade, a song by Hatty featuring galaco.
 * Nightmare ☆ Party Night, a song by Kuchibashi-P featuring Hatsune Miku.