Joan Cornellà Vázquez (born 11 January 1981) is a Spanish cartoonist and illustrator, famous for his unsettling, surreal humor and black humorous comic strips as well as artwork. Having graduated in fine arts, he has collaborated for numerous publications, such as La cultura del Duodeno, El Periódico, Ara and has illustrated for The New York Times.

Since 2010, he has provided cartoons for the Spanish magazine El Jueves. In 2012, Fracasa Major, a selection of Cornellà's black-and-white cartoons made from 2010 to 2012, was published. Most of the material was previously unpublished, although it also contains material published in El Jueves and various other fanzines.

In 2013, a third book of his, Mox Nox, was published via Bang Ediciones and in 2015 he self published his fourth book, Zonzo.

In 2015, Joan Cornellà had his debut US solo show at Spoke Art gallery in San Francisco, CA.