The Four Lords of the Diamond is a series of four science fiction novels by author Jack L. Chalker. Each volume of the series primarily follows a duplicate of a government agent as he lands on his prison planet and begins to both investigate the menace to the civilized worlds and find his position in his new society. The duplicates realize the stagnancy and corruption of the Confederacy, the intergalactic government in the series, and question their position as tools of the hierarchy. As the series progresses, the primary agent experiences each of his counterparts' divergent experiences and begins to question his beliefs as well. Like much of Chalker's work, the series deals with the effects physical transformations have on a character's personality.