San Teodoro is a comune (municipality) in the Province of Olbia-Tempio in the Italian region Sardinia, located about 180 km northeast of Cagliari and about 20 km southeast of Olbia. As of 31 December 2004, it had a population of 3,565 and an area of 104.8 km².

The municipality of San Teodoro contains the frazioni (subdivisions, mainly villages and hamlets) Suareddha, Monte Pedrosu, Straulas, Buddhitogliu, La Traversa, Lu Fraili, and Sitagliacciu.

San Teodoro borders the following municipalities: Budoni, Loiri Porto San Paolo, Padru, Torpè.

San Teodoro main beached from south to north coast are: Costa Caddu, L'Isuledda, Cala d'Ambra, La Cinta, Punta Aldia, Lu Impostu, Cala Brandinchi, Salina Bamba, Baia Salinedda, Cala Suaraccia, Cala Ginepro, Cala Girgolu.