X-23 is a superheroine appearing in American comic books published by Marvel Comics.

X23 may also refer to:

• X23 (New York City bus)
• "X23" (X-Men: Evolution), an episode of the television series X-Men: Evolution
• Martin X-23 PRIME, an American experimental lifting body
• Kh-23 (Russian: Х-23), a Soviet anti-ship missile
• TGOJ X23, a Swedish electric multiple unit
• ThinkPad X23, a notebook computer
• Umatilla Municipal Airport, Florida

This disambiguation page lists articles associated with the title X23.
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