Allen Township is a township in Jewell County, Kansas, United States. As of the 2000 census, its population was 43.
Allen Township covers an area of 34.85 square miles (90.27 square kilometers); of this, 0.01 square miles (0.02 square kilometers) or 0.02 percent is water. The streams of Dry Creek and Little Cheyenne Creek run through the township.
The township contains two cemeteries: Lutheran and West Hope.