| Gonnostramatza | |
| Official Name: | Comune di Gonnostramatza |
| Pushpin Map: | Italy Sardinia |
| Coordinates: | 39.6833°N 58°W |
| Region: | Sardinia |
| Province: | Oristano (OR) |
| Mayor: | Alessio Mandis |
| Area Total Km2: | 17.64 |
| Population Total: | 879 |
| Population As Of: | 1 January 2018[1] |
| Population Demonym: | Gonnostramatzesi (Sardinian: Tramatzesusu) |
| Elevation M: | 104 |
| Saint: | St. Michael Archangel |
| Day: | 29 September |
| Postal Code: | 09093 |
| Area Code: | 0783 |
Gonnostramatza, Gonnos-Tramatza in sardinian language, is a comune (municipality) in the Province of Oristano in the Italian region Sardinia, located about 60km (40miles) northwest of Cagliari and about 40km (30miles) southeast of Oristano, in the Marmilla.