"Extremis" is a six-issue story arc from the comic book series Iron Man (vol. 4), published in issues one through six in 2005 and 2006 by Marvel Comics. It was written by Warren Ellis and illustrated by Adi Granov. "Extremis" redefines the status quo for Iron Man, increasing the power of his armor significantly.
"Extremis" received mostly positive reviews, and is often listed as one of the best Iron Man stories. Elements of "Extremis" were adapted for the 2008 film Iron Man and the Iron Man: Armored Adventures episode "Extremis", and it serves as the primary source material for the 2013 film Iron Man 3.