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Springfield is a fictional city which serves as the primary setting of the American animated sitcom The Simpsons and related media. A mid-sized city in an indeterminate state of the United States, Springfield's geography, surroundings and layout are flexible, often changing to accommodate whatever the plot of any given episode requires.

According to the creator of the series Oregon native Matt Groening, Springfield was inspired by a number of real-life locations (including Springfield, Oregon and Springfield, Massachusetts); however to emphasize it as an example of "Anytown, USA", the location of the fictional Springfield remains a mystery, with various contradictory "clues" being found in numerous episodes of the series.