| Tergu | |
| Official Name: | Comune di Tergu |
| Native Name: | Zelgu |
| Pushpin Map: | Italy Sardinia |
| Coordinates: | 40.8667°N 51°W |
| Region: | Sardinia |
| Province: | Sassari (SS) |
| Mayor: | Luca Ruzzu |
| Area Total Km2: | 36.5 |
| Population Footnotes: | [1] |
| Population Total: | 589 |
| Population As Of: | 30 November 2014 |
| Population Demonym: | Targulani or Zelgulani |
| Elevation M: | 284 |
| Postal Code: | 07030 |
| Area Code: | 079 |
Tergu (Zelgu) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 190km (120miles) north of Cagliari and about 20km (10miles) northeast of Sassari in the Anglona historical regiona.
It is home to the Romanesque church of Nostra Signora di Tergu.