Hellboy is a fictional character, created by writer-artist Mike Mignola. He has appeared in a number of eponymous miniseries and one-shots, as well as some crossovers.

The character Hellboy is a demon who fights for the U.S. government and himself against dark forces including Nazis and Baba Yaga, in a series of tales that have their roots in folklore, pulp magazines, vintage adventure, and horror fiction.

The comics were adapted into a 2004 film starring Ron Perlman, a 2008 film sequel, Hellboy II: The Golden Army, and two straight-to-DVD animated films, Hellboy: Sword of Storms and Hellboy: Blood and Iron.