Union Township is a township in Jefferson County, Kansas, United States. As of the 2000 census, its population was 1,672.
Union Township covers an area of 42.83 square miles (110.92 square kilometers); of this, 0.13 square miles (0.33 square kilometers) or 0.3 percent is water. The stream of Scatter Creek runs through this township.
The township contains one cemetery, Fowler.