Atri (Greek: Ἀδρία or Ἀτρία; Latin: Adria, Atria, Hadria, or Hatria) is a comune in the Province of Teramo in the Abruzzo region of Italy. In 2001, it had a population of over 11,500. Atri is the setting of the poem, The Bell of Atri, by Henry Wadsworth Longfellow. Its name is the origin of the name of the Emperor Hadrian.

Ancient Adria was a city of Picenum, situated about 10 kilometres (6 mi) from the Adriatic Sea, between the rivers Vomanus (modern Vomano) and Matrinus (modern Piomba). According to the Antonine Itinerary, it was distant 15 Roman miles from Castrum Novum (modern Giulianova) and 14 from Teate (modern Chieti). It has been supposed, with much probability, to be of Etruscan origin, and a colony from the more celebrated city of the name, now Adria in the Veneto region, though there is no historical evidence of the fact.

The city was founded by Greeks from Aegina and reestablished by Dionysius I the tyrant of Syracuse in the 4th century BC.

The first certain historical notice of Adria is the establishment of a Roman colony there about 282 BCE. In the early part of the Second Punic War (217 BCE) its territory was ravaged by Hannibal; but notwithstanding this calamity, it was one of the 18 Latin colonies which, in 209 BCE, were faithful to the cause of Rome, and willing to continue their contributions both of men and money. At a later period, according to the Liber de Coloniis, it must have received a fresh colony, probably under Augustus: hence it is termed a Colonia, both by Pliny and in inscriptions. One of these gives it the titles of Colonia Aelia Hadria, whence it would appear that it had been re-established by the emperor Hadrian, whose family was originally derived from hence, though he was himself a native of Spain.

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