Grimjack is the main character of a comic book originally published by the American company First Comics. John Ostrander and Timothy Truman are credited as co-creators of the character, although Ostrander had been developing Grimjack with artist Lenin Delsol before Truman's arrival on the project according to Ostrander's own text piece in Grimjack #75. In that same essay, the writer also revealed having initially conceived the character to be the star of a series of prose stories, set in a post-apocalyptic Chicago.