Nicollet is a city in Nicollet County, Minnesota, United States. The population was 1,143 at the 2020 census. It is part of the Mankato—North Mankato Metropolitan Statistical Area. U.S. Route 14 and Minnesota State Highways 99 and 111 are the three main arterial routes in the community. Nearby Swan Lake Wildlife Management Area is one of the most significant waterfowl breeding areas in the upper Midwest.