Guillerm March is an Spanish comic book artist and professional illustrator. He worked for Spanish Publisher Eros Comix on some of their adult comic books in 2000. His first published work for DC Comics was also his debut on the American comic book industry in 2008 on the title Joker's Asylum: Poison Ivy and later he worked on other titles including Batman, Detective Comics, Azrael: Death's Dark Knight, Oracle: The Cure, Gotham Gazette and Gotham City Sirens, which is probably the work for which he is most easily recognized.

Most recently he has been working for DC on titles like Justice League Dark, Trinity of Sin, Sinestro, Earth 2: World's End, Starfire and he has also been working for Marvel Comics on the title Wolverines. His most recent creator-owned work with Image Comics is Karmen.