| Tongzi County | |
| Native Name: | 桐梓县 |
| Native Name Lang: | zh-Hans |
| Other Name: | Tungtze; Tungtse |
| Postal Code: | 563200 |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Pushpin Map: | Guizhou#Southwest China |
| Pushpin Label: | Tongzi |
| Pushpin Map Caption: | Location of the seat in Guizhou |
| Coor Pinpoint: | Tongzi County government |
| Coordinates: | 28.133°N 106.8247°W |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Guizhou |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Zunyi |
| Seat Type: | County seat |
| Seat: | Loushanguan Subdistrict |
| Area Total Km2: | 3193.54 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Population Total: | 521,567 |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Tongzi is a county under the administration of the prefecture-level city of Zunyi, in the north of Guizhou province, China, bordering Chongqing to the north.
The county government is located in the town of Loushanguan.
Tongzi County is divided into 2 subdistricts, 20 towns, 2 townships and 1 ethnic township:[1]