X may refer to:
- The X-Universe series, a long-running series of wide open sandbox games.
- X, a comic book series by Dark Horse Comics.
- X/1999, a manga series referred to as X in Japan.note
A number of musicians have called themselves X:
- The American band X
- The Australian band X Australia
- The Japanese band X Japan
- The late rapper XXXTentacion (commonly referred to as X)
Tropes brought to you by the letter X:
See This Trope Is X for tropes in which "X" is a placeholder.
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