| Dayi County | |
| Postal Code Type: | Postal code |
| Postal Code: | 6113XX |
| Settlement Type: | County |
| Pushpin Map: | China Sichuan |
| Pushpin Label: | Dayi |
| Pushpin Map Caption: | Location in Sichuan |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Sichuan |
| Subdivision Type2: | Sub-provincial city |
| Subdivision Name2: | Chengdu |
| Seat Type: | County seat |
| Seat: | Jinyuan Subdistrict |
| Area Total Km2: | 1548 |
| Population Footnotes: | [1] |
| Population Total: | 515,962 |
| Population As Of: | 2020 |
| Population Density Km2: | 378 |
| Coordinates: | 30.588°N 103.536°W |
| Timezone: | China Standard |
| Utc Offset: | +8 |
| Blank Name Sec1: | Chengdu district map |
Dayi County is a county of the City of Chengdu, capital city of Sichuan, China. It is Chengdu City's westernmost division, bordering the prefecture-level divisions of Ya'an to the south and the Ngawa Tibetan and Qiang Autonomous Prefecture to the north.
The Jianchuan Museum Cluster is located in the town of Anren, Dayi County, about one hour's drive from the provincial capital Chengdu. It consists of 15 museums which showcase China's largest private collection of artifacts amassed during the last 60–70 years.
Dayi County administers threw subdistricts and eight towns:[2]