| Aggius | |
| Official Name: | Comune di Aggius |
| Coordinates: | 40.9231°N 9.0644°W |
| Region: | Sardinia |
| Province: | Province of Sassari (SS) |
| Mayor: | Nicola Muzzu[1] |
| Frazioni: | Bonaita |
| Area Total Km2: | 83.5 |
| Population Total: | 1561 |
| Population As Of: | 30 September 2014[2] |
| Population Demonym: | Aggesi |
| Elevation M: | 514 |
| Postal Code: | 07020 |
| Area Code: | 079 |
Aggius (Gallurese: Agghju, Sardinian: Azos) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 190km (120miles) north of Cagliari and about 35km (22miles) west of Olbia.
Aggius borders the following municipalities: Aglientu, Bortigiadas, Tempio Pausania, Trinità d'Agultu e Vignola, Viddalba.