Greg Cox (born 1959) is a science fiction writer. He lives in Oxford, Pennsylvania, U.S..
He has written numerous Star Trek novels, including The Eugenics Wars (Volume One and Two), The Q Continuum, Assignment: Eternity, and The Black Shore. His short fiction can be found in such anthologies as Star Trek: Tales of the Dominion War, Star Trek: The Amazing Stories and Enterprise logs. His first "Khan" novel, The Eugenics Wars: Volume One, was voted best sci-fi book of the year by the readers of Dreamwatch magazine. Cox can be found in a bonus feature on the "Director's Edition" DVD of The Wrath of Khan.