| Jurisdiction: | Diocese |
| Jiading Diocese of Leshan | |
| Local: | Chinese: 天主教嘉定教區 Chinese: 天主教嘉定教区 |
| Latin: | Dioecesis Chiatimensis |
| Country: | China |
| Province: | Chongqing |
| Metropolitan: | Chongqing |
| Established: | July 10, 1929 |
| Denomination: | Roman Catholic |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Cathedral: | Sacred Heart of Jesus Cathedral, Leshan |
| Area Km2: | 27,000 |
| Population: | 2,645,000 |
| Population As Of: | 1950 |
| Bishop: | Paul Lei Shiyin |
| Metro Archbishop: | Sede vacante |
The Roman Catholic Diocese of Jiading (formerly spelled Kiating; Latin: Dioecesis Chiatimensis; Chinese: t=天主教嘉定教區|s=天主教嘉定教区), also known as Diocese of Leshan (Chinese: t=天主教樂山教區|s=天主教乐山教区|labels=no) according to the government controlled Catholic Patriotic Association, is a Latin Catholic diocese located in the city of Leshan (formerly Jiading Prefecture) in the ecclesiastical province of Chongqing in western China.
It was established on July 10, 1929 as the Apostolic Prefecture of Yachow for the Mission of Sichuan (Szechwan), its episcopal see was initially located in Yachow (present-day Ya'an).
The Diocese of Jiading covers Leshan (French: Kia-tin-fou), Emeishan (French: O-my-hien), Meishan (French: Mey-tcheou), and Ya'an (French: Ya-tcheou-fou).[1] It is bordered by the Diocese of Kangding to the west, Diocese of Ningyuan to the southwest, Diocese of Suifu to the south and east, and Diocese of Chengdu to the north.