Dan Abnett is a British comic book writer known for his work on the Marvel UK imprint and revitalizing the Guardians of the Galaxy franchise with fellow inker and writer Andy Lanning. He has also contributed to DC Comics titles, and his Warhammer Fantasy and Warhammer 40,000 novels and graphic novels for Games Workshop's Black Library now run to several dozen titles and have sold over two million copies.

He also uses the pseudonym Cal Hamilton.