Waseca () is a city in Waseca County, Minnesota, United States. The population was 9,410 at the 2010 census. It is the county seat.
U.S. Highway 14 and Minnesota Highway 13 are two of the main routes in the city. U.S. Highway 14 runs as an east–west freeway bypass just south of the city, while Minnesota Highway 13 passes through the city as State Street, running north–south.
According to the United States Census Bureau, the city has a total area of 5.19 square miles (13.44 km2); 4.00 square miles (10.36 km2) is land and 1.19 square miles (3.08 km2) is water.
As of the census of 2010, there were 9,410 people, 3,504 households, and 2,150 families living in the city. The population density was 2,352.5 inhabitants per square mile (908.3/km2). There were 3,818 housing units at an average density of 954.5 per square mile (368.5/km2). The racial makeup of the city was 89.0% White, 3.7% African American, 1.5% Native American, 1.0% Asian, 2.3% from other races, and 2.5% from two or more races. Hispanic or Latino of any race were 9.0% of the population.
There were 3,504 households, of which 30.9% had children under the age of 18 living with them, 44.7% were married couples living together, 11.7% had a female householder with no husband present, 5.0% had a male householder with no wife present, and 38.6% were non-families.