The Roman Catholic Diocese of Xuanhua/Süanhwa is a diocese located in the city of Xuanhua in the Ecclesiastical province of Beijing in China.
Xuanhua is an urban district of Zhangjiakou in northwestern Hebei Province, China.
Xuanhua is a very old city with a rich military and agricultural history. Xuanhua was historically the "Gateway to Beijing", which lies 180 km (112 mi) to its southeast. As a city with a large garrison close to the capital, it was strategically vital. It now has a population of 274,000 people. In modern times it has also become an industrial area, and now contains a high-tech development zone where new developments are being promoted by the government of Hebei Province.