Williamsburg Township is a township in Franklin County, Kansas, USA. As of the 2000 census, its population was 672. It was named for the small town of Williamsburg.
Williamsburg Township covers an area of 56.43 square miles (146.2 km2) and contains one incorporated settlement, Williamsburg. According to the USGS, it contains one cemetery, Mount Hope.
The stream of Mill Creek runs through this township.