X (also known as X: The Man with the X-Ray Eyes) is a 1963 science fiction/horror film.

X (real name Marvin Hoffman) is a fictional character, a mutant in the Marvel Comics Universe. His first appearance was in Brotherhood #1.

X is a comic book character who starred in his own self titled series published by Dark Horse Comics for their Comics Greatest World imprint. He is a dark undead anti-hero, with little true feeling and a strong tendency to kill.

X is a science fiction space simulator series created by German Developer Egosoft. These games are set in the X Universe. The games mix free roaming gameplay with trading, combat, empire building and missions; leading to the series' phrase Trade, Fight, Build, Think.

X is a contemporary short story writer and poet, his/her genres of choice ranging from dystopian science fiction to present-day realistic fiction. Not much is known about X, as he/she is notoriously private, but X is known for his/her dark, often paranoid themes, strange characters, and unusual plotlines reminiscent of authors [M. Gira] or [J.G.