The town's name honors San Teodoro from Amasea, soldier and martyr of the IV century A.D., to which the parish church is dedicated to. Municipality in the province of Olbia-Tempio located in Gallura region, at the foot of Mount Nieddu, San Teodoro is a famous tourist resort on the northeastern coast of Sardinia, in an inlet between Punta Sabbatino and Punta Ottiolu. The municipal area, which includes several districts, features a large lake area and several wide beaches.
The area was populated since Prehistoric and Nuragic Ages, while the first settlement is attested since the colonization of the Romans. In the XIII century the town was part of the Giudicato of Gallura and submitted the domain of Pisa. The population was decimated by plague epidemics and frequent pirate raids, until late XVII century, when San Teodoro started to repopulate. It was conquered by the Aragonese, and later became part of territories under the domain of the Savoy. With the assignment of municipalities, the town was linked to Posada, to which it already belonged during the Middle Ages. In 1927 it was assigned to the province of Nuoro and in 2005 to the province of Olbia-Tempio.

Attractions:
- the Church dedicated to St. Theodore Martyr of Amasea features a fine wooden portal, artwork of a local artist;
- the Church of Saint Andrew in Montipitrosu;
- the Church of Saint Anthony in Straula;
- the protected Marine Park of Tavolara-Capo Coda Cavallo, which extends from Punta Capo Ceraso to Punta Isuledda and includes the islands of Tavolara, Molarotto and Molara;
- the Nuraghe of district of Naracheddu;
- the lagoon with its birdlife;
- Marina Lu Impostu;
- Cala Brandinchi.