Brian Azzarello is an American comic book writer and screenwriter who first came to prominence with the hardboiled crime series 100 Bullets, published by DC Comics' mature-audience imprint Vertigo. Azzarello is best known for his numerous collaborations with artists Eduardo Risso and Lee Bermejo, his contributions to the Watchmen prequel project Before Watchmen and The Dark Knight Returns sequel series DK III: The Master Race, as well as for his stints on the long-running Vertigo series Hellblazer and The New 52 relaunch of the Wonder Woman title.

100 Bullets is an American comic book published by DC Comics under its Vertigo imprint. Written by Brian Azzarello and illustrated by Eduardo Risso, the comic book ran for 100 issues and won the Eisner Award and Harvey Award.