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Delavan is a city in Walworth County, Wisconsin, United States. The population was 8,463 at the 2010 census. The city is located partially within the Town of Delavan.
Delavan is home to the Wisconsin School for the Deaf, and Andes Candies.
Delavan sits in the middle of what was at one time an inland sea. During the Ice Age, many glaciers, the last of which was known as the Michigan tongue, covered this area. The Michigan tongue descended down what is now known as Lake Michigan. A large section of this glacier broke off, pushing southwest into the area now known as Walworth County. Geologists have called this section of the glacier "the Delavan lobe".