| Schedule: | Monthly |
| Ongoing: | y |
| Publisher: | Marvel Comics |
| Date: | December 1999 – September 2001 |
| Issues: | 22 |
| Main Char Team: | X-Men |
| Writers: | John Byrne |
| Pencillers: | John Byrne |
| Inkers: | Tom Palmer |
| Letterers: | John Byrne |
| Colorists: | Gregory Wright |
| Editors: | Bob Harras Jason Liebig Lysa Hawkins Joe Quesada |
| Subcat: | Marvel Comics |
| Sort: | X-Men: The Hidden Years |
X-Men: The Hidden Years was a comic book series published by Marvel Comics, which starred the company's popular superhero team, the X-Men. It was written by John Byrne, with illustrations by Byrne and Tom Palmer.
The series was intended to fill in the team's chronology during the early 1970s when the original X-Men comic (#67–93) was publishing only reprints of earlier issues. According to Byrne, the series "was clearly finite, since [''Giant-Size X-Men'' #1] was out there as an "end point" for my series, but the way I had it worked out, I could have easily done 100 issues or more before I had to send the team off to Krakoa."[1] However, as part of a retooling of the X-Men line, X-Men: The Hidden Years was cancelled, prematurely ending its run with issue #22.
Hidden Years featured the cast of the original X-Men and their villains, with a few appearances by characters who had not otherwise appeared at that point in time, such as Storm and the Phoenix Force.