The Roman Catholic Diocese of Hanzhong (formerly spelled Hanchung; Latin: Dioecesis Hanciomensis; Chinese: 天主教漢中教區), 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, 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.

This article on a Roman Catholic diocese in China is a stub.