| Siddi | |
| Official Name: | Comune di Siddi |
| Pushpin Map: | Italy Sardinia |
| Coordinates: | 39.6667°N 61°W |
| Region: | Sardinia |
| Province: | South Sardinia |
| Mayor: | Stefano Puddu |
| Area Total Km2: | 11.0 |
| Population Total: | 708 |
| Population As Of: | 31 December 2010[1] |
| Population Demonym: | Siddesi |
| Elevation M: | 187 |
| Postal Code: | 09020 |
| Area Code: | 070 |
Siddi is a comune (municipality) in the Province of South Sardinia in the Italian region Sardinia, located about 50km (30miles) northwest of Cagliari and about 11km (07miles) north of Sanluri in the Marmilla historical sub-region.
Siddi borders the following municipalities: Baressa, Collinas, Gonnoscodina, Gonnostramatza, Lunamatrona, Pauli Arbarei, Ussaramanna. It is home to several archaeological findings, including a domus de janas from the Ozieri culture, a Giants' tomb and several nuraghe villages.