| Xiaoyi | |
| Native Name Lang: | zh |
| Settlement Type: | County-level city |
| Pushpin Map: | China Shanxi |
| Pushpin Map Caption: | Location in Shanxi |
| Coordinates: | 36.0833°N 142°W |
| Subdivision Type: | Country |
| Subdivision Name: | People's Republic of China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Shanxi |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Lüliang |
| Seat Type: | City seat |
| Unit Pref: | Metric |
| Area Total Km2: | 946.0 |
| Area Urban Km2: | 54.50 |
| Area Footnotes: | [1] |
| Population Density Km2: | auto |
| Population Total: | 492000 |
| Population As Of: | 2017 |
| Population Urban: | 293600 |
| Timezone1: | China Standard |
| Utc Offset1: | +8 |
| Postal Code Type: | Postal code |
Xiaoyi is a county-level city under the administration of Lüliang prefecture-level city, in Shanxi Province, China.
Xiaoyi was built by the State of Jin in 594 BC, named Guayang in Spring and Autumn period. It was renamed Zhongyang in Three Kingdoms period and Yong'an in Northern Wei period. In 627 AD (Tang dynasty), It was renamed Xiaoyi by Emperor Taizong of Tang.
Xiaoyi is known for its mineral resources, including coal, Iron ore and bauxite. It is also known for walnuts and shadow play.