(Fr. *Oneille*), a seaport-town of the kingdom of Sardinia, capital of a province of the same name, in the division of Nice, at the mouth of the Impero, 55 miles S.W. of Genoa, and 41 E.N.E. of Nice. It is defended by fortifications, partly destroyed by the French in 1792; and contains a handsome church, court of justice, public offices, convents, grammar school, hospital, &c. Manufactures of soap, leather, &c., are carried on. The harbour is not good; but the situation is favourable for commerce. Pop. 5500. The province of Oneglia is mountainous in the N., and slopes gradually down to the sea. Its principal produce is olives. Pop. (1848) 60,072.