| Jurisdiction: | Diocese |
| Chiayi | |
| Latin: | Dioecesis Kiayiensis |
| Local: | 天主教嘉義教區 |
| Territory: | Chiayi and counties of Chiayi and Yunlin |
| Province: | Taipei |
| Metropolitan: | Taipei |
| Area Km2: | 3,244 |
| Population: | 1,582,934 |
| Population As Of: | 2006 |
| Catholics: | 17,820 |
| Catholics Percent: | 1.1 |
| Denomination: | Roman Catholic |
| Metro Archbishop: | Thomas Chung An-zu |
| Suffragan: | for one --> |
| Archdeacon: | for one--> |
| Map: | Taiwan - Diocesi di Kiayi.png |
| Website: | Website of the Diocese |
| Showflag: | stp |
| S: | 天主教嘉義教区 |
| T: | 天主教嘉義教區 |
| P: | tiān zhǔ jiào Jiāyì jiàoqū |
| W: | T'iēnchǔchiào Chā-ì chiàoch'ǘ |
| Myr: | tyān jǔ jyàu Jyāyì jyàuchyū |
| Poj: | Thian-chú-kàu Ka-gī kàu-khu |
| Tp: | tiān jhǔ jiào Jiāyì jiàocyū |
| Lang1: | Latin |
| Lang1 Content: | Dioecesis Kiayiensis |
The Diocese of Chiayi (Latin: Dioecesis Kiayiensis) is a Latin Church diocese of the Catholic Church in Taiwan.
Originally erected as an Apostolic Prefecture of Chiayi in 1952, the Prefecture was elevated to a full diocese in 1962. The diocese is a suffragan of the Archdiocese of Taipei.