When did the Hulk first appear in a comic book?

The answer is: 1962. While many superheroes got their debuts in other comics or anthologies, the Hulk first appeared in the debut issue of his very own series, The Incredible Hulk.Issue #1 came out in May of 1962, and introduced Dr. Bruce Banner, who gets hit with a G-Bomb while saving a teenager from its test blast. We just barely see him transform into Hulk before the issue ends. Surprise! He's not green. He's actually a gray color that Stan Lee preferred, but printing limitations forced them to choose a new color — and green was easier.Source