Ashippun is a town in Dodge County, Wisconsin, United States. The census-designated place of Ashippun and unincorporated communities of Alderley and Old Ashippun are located in the town. The population was 2,308 at the 2000 census.
The primary community area is actually split into two parts, Ashippun and Old Ashippun. Old Ashippun was the original location, but when the first railroad was built several miles away, a large portion of the community relocated, as occurred with nearby Lebanon.