Critias is a dialogue written by the ancient Greek philosopher Plato. It is part of a series of works that explore the story of Atlantis, a legendary island said to have existed thousands of years ago. In this dialogue, Critias recounts the history and virtues of Atlantis, describing it as a powerful and advanced civilization that eventually fell out of favor with the gods. The dialogue is notable for its philosophical themes, including the nature of power and morality. Although Critias remains unfinished, it has significantly influenced later interpretations of Atlantis and discussions about ideal societies in philosophy and literature.