Warren Girard Ellis is an English comic book writer, novelist, and screenwriter. He is best known as the co-creator of several original comics series, including Transmetropolitan (1997–2002), Global Frequency (2002–2004) and Red (2003–2004), which was adapted into the feature films Red (2010) and Red 2 (2013). Ellis is the author of the novels Crooked Little Vein (2007) and Gun Machine (2013) and the novella Normal (2016).

Transmetropolitan is a cyberpunk transhumanist comic book series written by Warren Ellis and drawn by Darick Robertson; it was published by the American company DC Comics in 1997–2002. The series was originally part of the short-lived DC Comics imprint Helix, but upon the end of the book's first year the series was moved to the Vertigo imprint after DC Comics shut down their Helix imprint. Transmetropolitan chronicles the battles of Spider Jerusalem, infamous renegade gonzo journalist of the future.