Sedan Township is a township in Chautauqua County, Kansas, United States. As of the 2020 census, its population was 1,367.
Sedan Township covers an area of and contains one incorporated settlement, Sedan (the county seat). The streams of Deer Creek, Fly Creek and Wolf Creek run through this township. According to the United States Geological Survey, it contains two cemeteries: Casement and Greenwood.
Sedan Township contains one airport, Sedan City Airport.