Nightmare (disambiguation)

Nightmare may refer to:
 * Nightmare, an enemy in the series that is an Assist Trophy in Super Smash Bros. 4 and Super Smash Bros. Ultimate.
 * , an enemy in the series who appears as:
 * A trophy in Super Smash Bros. for Wii U.
 * A spirit in Super Smash Bros. Ultimate.
 * , a Melee main  from Canada.
 * Nightmare, one of 's many aliases.