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Mystery fiction is a literary genre in which a story's protagonist investigates a puzzling event requiring an explanation or solution. Almost all examples of mystery fiction focus on the investigation of one or more crimes and thus fall within the broader field of crime fiction. Authors of crime fiction in which mystery investigation and solution are nongermane (e.g., The Godfather, The Postman Always Rings Twice) should be named only in the appropriate category, Category:American crime fiction writers, not as "mystery" writers.

This category should include writers who wrote mysteries in any medium, whether it be novels, short stories, poems, plays, screen plays or some other form.