Duff Beer is a brand of beer that originated as a fictional beverage on the American animated series The Simpsons. Beers using the Duff branding have been brewed in a number of countries, resulting in legal battles with varying results. An official version is sold in three variations near the Simpsons Ride at Universal Studios. In 2015, 20th Century Fox, the producer of The Simpsons, began selling licensed Duff beer in Chile, with a view to driving out brandjacking.

Springfield is the primary fictional setting of the American animated sitcom The Simpsons and related media. It is an average-sized, fictional city within an unknown state in the United States. The fictional city's geography, surroundings, and layout are flexible, often changing to accommodate the plot of any given episode.