| Tây Sơn district | |
| Settlement Type: | District |
| Native Name: | Huyện Tây Sơn |
| Pushpin Map: | Vietnam |
| Pushpin Relief: | 1 |
| Pushpin Label Position: | right |
| Coordinates: | 13.917°N 108.917°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | South Central Coast |
| Subdivision Type2: | Province |
| Subdivision Name2: | Bình Định |
| Seat Type: | Capital |
| Seat: | Phú Phong |
| Area Total Km2: | 690 |
| Population As Of: | 2018 |
| Population Footnotes: | [1] |
| Population Total: | 187,830 |
| Population Density Km2: | 272 |
| Timezone: | Indochina Time |
| Utc Offset: | +7 |
Tây Sơn is a district (huyện) of Bình Định province in the South Central Coast region of Vietnam. It is known for being the birthplace of the Tây Sơn dynasty.
The district capital lies at Phú Phong.[2]
Tây Sơn borders Gia Lai province to the west, the districts of An Nhơn and Phù Cát to the east, Vĩnh Thạnh to the north and Vân Canh to the south.
Most of the communes of Tây Sơn District lie on provincial road 19 between An Nhơn and Gia Lai province.