A dystopia is a community or society that is in some important way undesirable or frightening. It is the opposite of a utopia. Such societies appear in many artistic works, particularly in stories set in a future. Dystopias are often characterized by dehumanization, totalitarian governments, environmental disaster, or other characteristics associated with a cataclysmic decline in society.

Dystopian societies appear in many sub-genres of fiction and are often used to draw attention to real-world issues regarding society, environment, politics, economics, religion, psychology, ethics, science, and/or technology, which if unaddressed could potentially lead to such a dystopia-like condition.