Locris, a territory of ancient Greece, occupied by the Locrians, who were said to have been descended from the Leleges. Their territory, in the opinion of Niebuhr, originally extended across the continent from the Corinthian gulf to the Euboean strait; but the encroachments of the Phocians and Dorians gradually deprived them of the central portions, and confined them to the maritime districts. The Opuntii and Epienemidii, whose territories lay toward the east, became comparatively civilized; but the western tribe remained in a semi-barbarous state. The territories of the Locri Epicnemidii (so called from their proximity to Mount Cnemis) and Locri Opuntii (named from their chief city Opus) stretched along the Euboean strait and Malian gulf from the mouth of the river Cephissus to the pass of Thermopylae, save where a strip of Phocis severed them. The Locrians are represented by Homer as following Ajax the son of ofileus to the Trojan war with 40 ships. In the Persian war the Opuntii sent a contingent under Leonidas to Thermopylae, and a squadron of seven ships to aid the confederate fleet.

During the Peloponnesian Avar the eastern Locrians sided with Sparta. - The territory of the Ozolian or western Locrians was bounded N. E. by Doris, E. by Phocis, S. by the Corinthian gulf, and W. and N. W. by AEtolia. It is a mountainous and barren district. The surname of its inhabitants (Ozolae, stinkards) was probably derived from the fetid sulphur springs which abound. The chief towns were Amphis-sa, Naupactus (now Lepanto), and Eupalium. The Ozolian Locrians first appear in history during the Peloponnesian war, and are classed by Thucydides with the half-savage .AEtolians and Acarnanians, whom they resembled in many respects. In 426 B. C. they promised to aid the Athenian general Demosthenes against the .AEtolians, but after his defeat they submitted to Eurylochus, the Spartan commander. In the latter days of Grecian independence they were members of the AEtolian confederacy. After the Roman conquest of Greece, all Locris was absorbed in the province of Achaia.