| Xincheng County | |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Coordinates: | 24.066°N 108.6657°W |
| Pushpin Map: | China Guangxi |
| Pushpin Label: | Xincheng |
| Pushpin Map Caption: | Location of the seat in Guangxi |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Autonomous region |
| Subdivision Name1: | Guangxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Laibin |
| Seat Type: | County seat |
| Seat: | Chengguan |
| Area Total Km2: | 2541 |
| Population Total: | 297825 |
| Population As Of: | 2020 |
| Population Density Km2: | auto |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Xincheng County (; Zhuang; Chuang: Yinhcwngz Yen) is a county in the central part of Guangxi, China. It is the westernmost county-level division of the prefecture-level city of Laibin.
Xincheng County is divided into 6 towns and 6 townships:[1]