Grayslake is a village in Lake County in the U.S. state of Illinois. It is located in the Chicago metropolitan area, about 40 miles (64 km) north of Chicago's downtown, 14 miles (23 km) west of Lake Michigan, and 15 miles (24 km) south of the Wisconsin border. The village's population at the 2010 census was 20,957.
Grayslake is home to the College of Lake County, the University Center of Lake County and the Lake County Fairgrounds. There are tentative plans to develop a lifestyle shopping center on the previous location of the Lake County Fairgrounds. At the south end of Grayslake, there are plans for a development containing light industry, office space and residential space.