George Clayton Johnson (July 10, 1929 – December 25, 2015) was an American science fiction writer, best known for co-writing with William F. Nolan the novel Logan's Run, the basis for the MGM 1976 film. He was also known for his television scripts for The Twilight Zone (including "Nothing in the Dark", "Kick the Can", "A Game of Pool", and "A Penny for Your Thoughts"), and the first telecast episode of Star Trek, entitled "The Man Trap". He also wrote the story and screenplay on which the 1960 and 2001 films Ocean's Eleven were based.