The X-Men # 40
- Series: The X-Men
- Issue: 40
- Publisher: Marvel
- Era: Silver Age
- Published Date: January 1968
- Cover: George Tuska, Marie Severin, Sam Rosen
- Writers: Roy Thomas
- Pencil: George Tuska, Don Heck, Werner Roth
- Ink: George Tuska, John Verpoorten
- Appearances: X-Men [Cyclops, Marvel Girl, Angel, Iceman, Beast], The Frankenstein Android
Story 1: "The Mark of the Monster!"
Story 2: "The First Evil Mutant!"
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