Owatonna is a city in Steele County, Minnesota, United States. The population was 25,599 at the 2010 census. It is the county seat of Steele County. Owatonna is home to the Steele County Fairgrounds, which hosts the Steele County Free Fair in August.
Interstate 35 and U.S. Routes 14, and 218 are three of the main arterial routes in the city.
Owatonna was first settled in 1853 around the Straight River. The community was named after the Stright River, which in the Dakota language is Wakpá Owóthaŋna. The earliest the Owatonna area was settled was in 1854 and platted in September 1855, but it was incorporated as a town August 9, 1858, then as a city on February 23, 1865.