Decimomannu
| Decimomannu | |
|---|---|
| Comune di Decimomannu | |
| Church of Santa Greca | |
| Location of Decimomannu | |
| Coordinates: 39°19′N 8°58′E / 39.317°N 8.967°E | |
| Country | Italy | 
| Region | Sardinia | 
| Metropolitan city | Cagliari (CA) | 
| Government | |
| • Mayor | Anna Paola Marongiu | 
| Area | |
|  • Total | 28.1 km2 (10.8 sq mi) | 
| Elevation | 12 m (39 ft) | 
| Population  (2025) | |
|  • Total | 8,355 | 
| • Density | 300/km2 (770/sq mi) | 
| Demonym | Decimanamesi | 
| Time zone | UTC+1 (CET) | 
| • Summer (DST) | UTC+2 (CEST) | 
| Postal code | 09033 | 
| Dialing code | 070 | 
Decimomannu (Sardinian: Deximumannu or Déximu Mannu [ˌdeʒimuˈmanːu]) is a comune (municipality) in the Metropolitan City of Cagliari in the region of Sardinia in Italy, located about 17 km (11 mi) northwest of central Cagliari. It has 8,355 inhabitants.