George Powers Cockcroft, widely known by the pen name Luke Rhinehart, was an American novelist, screenwriter, and nonfiction writer. He is best known for his 1971 novel The Dice Man, the story of a psychiatrist who experiments with making life decisions based on the roll of a dice.

The Dice Man is a 1971 novel by American novelist George Cockcroft, writing under the pen name "Luke Rhinehart". The book tells the story of a psychiatrist who makes daily decisions based on the casting of a diсe. Cockcroft describes the origin of the title idea variously in interviews, once recalling a college "quirk" he and friends used to decide "what they were going to do that night" based on a die-roll, or sometimes to decide between mildly mischievous pranks.