Mission Township is a township in Brown County, Kansas, United States. As of the 2000 census, its population was 645.
Mission Township was formed in 1872.
Mission Township covers an area of . It contains one incorporated settlement, Willis, and surrounds another, the governmentally independent city of Horton. According to the USGS, it contains four cemeteries: Carr, Claytonville, Kennekuk and Saint Peters.
The stream of Hazel Creek runs through this township.
Mission Township contains one airport or landing strip, Horton Municipal Airport.