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is a city in Carroll County, Illinois, United States. The population was 1,832 at the 2000 census. As of the 2005 census estimate, the population of Mount Carroll had shrunk to 1,704.
Shimer College was established in Mt. Carroll in 1853, but mounting debts forced a move to Waukegan, Illinois in 1979. The campus now is home to several organizations, most notably the Campbell Center for Historic Preservation Studies.
Political scientist Robert Keohane grew up in Mt. Carroll before attending Shimer. A Blackwater USA training facility opened near the town in 2006.
According to the United States Census Bureau, the city has a total area of 1.9 square miles (4.9 km²), all of it land.