What superhero appeared in a comic for the first time in the 1930?

The superhero who first appeared in a comic in the 1930s is Superman. He made his debut in "Action Comics" #1, published in June 1938, created by Jerry Siegel and Joe Shuster. Superman is often credited with launching the superhero genre, becoming an iconic figure in popular culture and leading to the creation of many other superheroes in the following decades.