The Diocese of Hanzhong, also known as Diocese of Nancheng, is a Latin Catholic ecclesiastical territory or diocese of the Catholic Church in Shaanxi, China. The episcopal see is the city of Hanzhong in Southern Shaanxi. The Diocese of Hanzhong is in the ecclesiastical province of the metropolitan Archdiocese of Xi'an. It was established on August 2, 1887 as an apostolic vicariate.