| Xiyang | |
| Other Name: | Siyang |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Image Map1: | File:Location of Jinzhong Prefecture within Shanxi (China).png |
| Map Caption1: | Jinzhong in Shanxi |
| Coordinates: | 37.611°N 113.707°W |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Shanxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Jinzhong |
| Population Density Km2: | auto |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Xiyang County is a county in the east of Shanxi province, China, bordering Shanxi province to the east. It is the easternmost county-level division of the prefecture-level city of Jinzhong.