| Ollastra | |
| Official Name: | Comune di Ollastra |
| Native Name: | Ollasta |
| Pushpin Map: | Italy Sardinia |
| Coordinates: | 39.95°N 52°W |
| Region: | Sardinia |
| Province: | Province of Oristano (OR) |
| Mayor: | Giovannino Angelo Cianciotto |
| Area Total Km2: | 21.47 |
| Population Footnotes: | [1] |
| Population Total: | 1212 |
| Population As Of: | 31 December 2017 |
| Population Demonym: | Ollastrini |
| Elevation M: | 23 |
| Postal Code: | 09084 |
| Area Code: | 0783 |
Ollastra (Sardinian: Ollasta) is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 90km (60miles) northwest of Cagliari and about 14km (09miles) northeast of Oristano.
Ollastra Simaxis borders the following municipalities: Fordongianus, Siapiccia, Simaxis, Villanova Truschedu, Zerfaliu.
From 1928 to 1946 the place was a frazione of nearby Simaxis and was therefore known as Ollastra Simaxis. It changed its name to simply Ollastra in 1991.