Muskego is a city in Waukesha County, Wisconsin, United States. As of the 2000 census, the city had a population of 21,397. Its 2006-2008 estimated population was 22,851. Muskego is the fifth largest community in Waukesha County. The name Muskego is derived from the Potawatomi Indian name for the area, "Mus-kee-Guaac", meaning sunfish. The Potawatomi were the original inhabitants of Muskego. There are three lakes within the city's boundaries.
Once an agricultural area, Muskego was incorporated as a city in 1964. When it became a city it included the unincorporated communities of Tess Corners and Durham Hill. With an increase in housing developments in the city, it has become a bedroom community for Milwaukee.
Muskego Beach Amusement Park (1861–1967), later known as DandeLion Park(1968–1977), was a popular amusement park located on the southern bank of Little Muskego Lake. It was at some point home of the world's fastest roller coaster.