| Jurisdiction: | Diocese |
| Qinzhou | |
| Local: | Chinese: 天主教秦州教區 Chinese: 天主教秦州教区 |
| Latin: | Dioecesis Zinceuvensis |
| Country: | China |
| Province: | Lanzhou |
| Metropolitan: | Lanzhou |
| Established: | April 28, 1905 |
| Denomination: | Roman Catholic |
| Sui Iuris Church: | Latin Church |
| Rite: | Roman Rite |
| Cathedral: | Dongguan Cathedral, Tianshui |
| Patron: | Fidelis of Sigmaringen[1] |
| Area Km2: | 45,000 |
| Population: | 2,500,000 |
| Population As Of: | 1950 |
| Catholics: | 8,548 |
| Catholics Percent: | 0.3 |
| Bishop: | John Wang Ruowang |
| Metro Archbishop: | Joseph Han Zhihai |
The Roman Catholic Diocese of Qinzhou (formerly spelled Tsinchow; Latin: Dioecesis Zinceuvensis; Chinese: t=天主教秦州教區), also known as Diocese of Tianshui according to the government controlled Catholic Patriotic Association, is a Latin Catholic diocese located in Qinzhou, Tianshui, Gansu (formerly Kansu) in the ecclesiastical province of Lanzhou in western China. It was established on April 28, 1905 as an apostolic vicariate.
The Diocese of Qinzhou is bordered by the Diocese of Fengxiang and Diocese of Hanzhong to the east, Archdiocese of Lanzhou to the northwest, Diocese of Pingliang to the northeast, Diocese of Kangding to the southwest, and Diocese of Chengdu to the southeast.