​OLHÃO, a seaport of southern Portugal, in the district of Faro; 5 m. E. of Faro, on the Atlantic coast. Pop. (1900) 10,009. Olhão has a good harbour at the head of the Barra Nova, a deep channel among the sandy islands which fringe the coast. Wine, fruit, cork, baskets and sumach are exported in small coasting ​vessels; there are important sardine and tunny fisheries; and boats, sails and cordage are manufactured.