Union Township is a township in Kingman County, Kansas, United States. As of the 2000 census, its population was 88.
Union Township covers an area of 36.23 square miles (93.84 square kilometers); of this, 0.09 square mile (0.24 square kilometer) or 0.26 percent, is water. The streams of Mead Creek, Painter Creek and Pat Creek run through this township.