The Roman Catholic Diocese of Chengdu is a suffragan Latin Catholic diocese in the ecclesiastical province of Chongqing covering southwestern China's Sichuan area, yet depends on the missionary Roman Congregation for the Evangelization of Peoples.

Marie-Julien Dunand, also known in Chinese as Du Ang, was a French priest who was the Catholic apostolic vicar of North-Western Szechwan from 1893 to 1915. He was a recipient of the Legion of Honour.