| Aglientu | |
| Official Name: | Comune di Aglientu |
| Native Name: | Santu Francìscu di l'Aglièntu |
| Pushpin Map: | Italy Sardinia |
| Coordinates: | 41.0833°N 16°W |
| Region: | Sardinia |
| Province: | Sassari (SS) |
| Mayor: | Antonio Tirotto |
| Area Total Km2: | 148.19 |
| Population Total: | 1234 |
| Population As Of: | 30 June 2017[1] |
| Population Demonym: | Aglientesi |
| Elevation M: | 420 |
| Postal Code: | 07020 |
| Area Code: | 079 |
Aglientu (Santu Francìscu di l'Aglièntu) is a comune (municipality) in the Province of Sassari in the Italian region Sardinia, located about 210km (130miles) north of Cagliari and about 35km (22miles) northwest of Olbia.
Aglientu borders the following municipalities: Aggius, Luogosanto, Santa Teresa Gallura, Tempio Pausania, Trinità d'Agultu e Vignola.
In 2005 Aglientu hosted the Kitesurf World Cup. It is home to the Festa del Turista ("Tourist's Feast").