Korčula (Croatian: [kɔ̂ːrtʃula] ( listen); Greek: Κόρκυρα Μέλαινα, Latin: Corcyra Nigra, Korkyra Melaina, Old-Slavic Krkar, Venetian and Italian Curzola) is an island in the Adriatic Sea, in the Dubrovnik-Neretva County of Croatia. The island has an area of 279 km² (108 sq mi); 46.8 km (29.1 mi) long and on average 7.8 km (4.8 mi) wide — and lies just off the Dalmatian coast. Its 16,182 (2001) inhabitants make it the second most populous Adriatic island after Krk. The population are mainly ethnic Croats (96.77%).

The island of Korčula belongs to the central Dalmatian archipelago, separated from the Pelješac peninsula by a narrow strait of Pelješac, between 900 and 3,000 metres (3,000 and 9,800 ft) wide (illustration, right). It is the sixth largest Adriatic island with a rather indented coast. The highest peaks are Klupca, 568 m (1,864 ft) above sea level and Kom, 510 m (1,670 ft) high. The climate is mild; an average air temperature in January is 9.8 °C and in July 26.9 °C; the average annual rainfall is 1,100 mm. The island is largely covered with Mediterranean flora including extensive pine forests.