Armor is a military science fiction novel by John Steakley. It has some superficial similarities with Robert Heinlein's Starship Troopers (such as the military use of exoskeletons and insect-like alien enemies.) but this novel has more to do with the psychological effects of violence on human beings than with the political aspects of the military, which were the focus of Robert Heinlein's novel.

It was first published in December 1984.