The Trèmiti islands are an archipelago of the Adriatic Sea, 22 km north of the Gargano promontory and 45 km east of Termoli (Molise coast).

Administratively, the archipelago constitutes the scattered municipality of the Tremiti Islands of 475 inhabitants in the province of Foggia in Puglia. The capital is San Nicola, on the homonymous island. The town is part of the Gargano National Park. Since 1989 a portion of its territory constitutes the Tremiti Islands Marine Nature Reserve.