South Bend Township is a township in Blue Earth County, Minnesota, United States. The population was 1,682 as of the 2010 census. South Bend Township was organized in 1858, and named from a meander in the Minnesota River.

According to the United States Census Bureau, the township has a total area of 16.9 square miles (43.7 km²), of which 16.4 square miles (42.5 km²) is land and 0.42 square miles (1.1 km²), or 2.62%, is water. The Minnesota River forms the township’s northern border, and one of its tributaries, the Blue Earth River, forms the eastern boundary. South Bend is bordered by Judson Township on the west side, Rapidan Township on the south side, and Mankato Township on the east side (separated by the Blue Earth River). In the late 1800s the portion of South Bend Township east of the Blue Earth River was designated as part of Mankato Township.