| Kaiyang County | |
| Native Name: | 开阳县 |
| Native Name Lang: | zh-Hans |
| Postal Code Type: | Postal code |
| Settlement Type: | County |
| Image Map1: | Location of Guiyang Prefecture within Guizhou (China).png |
| Map Caption1: | Guiyang in Guizhou |
| Coordinates: | 27.0578°N 106.9647°W |
| Coor Pinpoint: | Kaiyang County government |
| Subdivision Type: | Country |
| Subdivision Name: | China |
| Subdivision Type1: | Province |
| Subdivision Name1: | Guizhou |
| Subdivision Type2: | Prefecture-level city |
| Subdivision Name2: | Guiyang |
| Seat Type: | County seat |
| Seat: | Xicheng |
| Area Total Km2: | 2026 |
| Population Total: | 358,130 |
| Population As Of: | 2010 |
| Population Density Km2: | auto |
| Timezone: | China Standard |
| Utc Offset: | +8 |
Kaiyang County is a county of central Guizhou province, China. It is under the administration of Guiyang City.
Kaiyang County comprises 3 subdistricts, 7 towns, 5 townships and 3 ethnic townships:[1]
Kaiyang railway station is the terminus of the Guiyang–Kaiyang intercity railway, opened in 2015.