Giant-Size X-Men #1 was a special issue of the X-Men comic book series, published by Marvel Comics in 1975. It was written by Len Wein and illustrated by Dave Cockrum. Though not a regular issue, it contained the first new X-Men story in five years. The issue serves as a link between the original X-Men and a new team. Chronologically it is placed after X-Men #66 and before X-Men #94. The 68-page book was published with a May 1975 cover date and distributed to newsstands in February of that year.