Nightmare (ナイトメア) , also known as the Cloaked Nightmare according to the Star Rod trophy in Super Smash Bros. Melee, is a fictional character featured in the Kirby series of video games. He was the ultimate villain of Kirby's Adventure, the franchise's sole Nintendo Entertainment System game, and was the final boss Kirby had to fight.

Nightmare (ナイトメア　Naitomea) is a fictional character designed for the Soul Series of fighting games. Nightmare made his first appearance in Soul Calibur and has returned for both Soul Calibur II and Soul Calibur III. This character originally appeared in Soul Blade as "Siegfried!", an extra costume for Siegfried that was actually used to represent Siegfried's possession (by Soul Edge) in Siegfried's ending.

Nightmare is a fictional character, a supernatural being who has appeared in many Marvel Comics stories, most commonly as one of Doctor Strange's major enemies.

"Nightmare" is an episode of the original The Outer Limits television show. It first aired on 2 December, 1963, during the first season.

"Nightmare" is an episode of The Outer Limits television show. It was first broadcast on Friday August 14 of 1998, during the fourth season. It is a remake of "Nightmare" (1963), an episode of the original series.

"Nightmare" is episode fourteen of the first season of the television series Supernatural. This episode deals with telekinesis and clairvoyance.