St. Peter is a city and the county seat of Nicollet County, Minnesota, United States. It is 10 miles north of the Mankato–North Mankato metropolitan area. The population was 12,066 at the 2020 census. It is home to Gustavus Adolphus College.
U.S. Highway 169 and Minnesota State Highways 22 and 99 are three of the city's main routes. St. Peter is known for being located on the scenic Minnesota River valley, being home to the St. Peter State Hospital Museum, the Traverse Des Sioux historic site and the St. Peter Armony. Also, St. Peter's sister city is Petatlán, Guerrero, Mexico.