Korčula (kɔ̂ːrtʃula, Curzola) is a Croatian island in the Adriatic Sea. It has an area of , is long and on average wide, and lies just off the Dalmatian coast. Its 15,522 inhabitants (2011) make it the second most populous Adriatic island after Krk. The population are almost entirely ethnic Croats (95.74%). The island is twinned with Rothesay in Scotland.
The island of Korčula belongs to the central Dalmatian archipelago, separated from the Pelješac peninsula by a narrow Strait of Pelješac, between wide. It stretches in the east–west direction, in length of ; on average, it is wide. With an area of , it is the sixth largest Adriatic island. The highest peaks are Klupca, and Kom, high.
Main settlements on the island are towns of Korčula, Blato and Vela Luka. Villages along the coast are Brna, Račišće, Lumbarda and Prižba; Žrnovo, Pupnat, Smokvica and Čara are located inland. The island is divided into municipalities of Korčula, Smokvica, Blato and Lumbarda. The climate is Mediterranean; an average air temperature in January is and in July ; the average annual rainfall is . The island is largely covered with Mediterranean flora including extensive pine forests.
The main road runs along the spine of the island connecting all settlements from Lumbarda on the eastern to Vela Luka on the western end, with the exception of Račišće, which is served by a separate road running along the northern coast. Ferries connect the town of Korčula with Orebić on the Pelješac peninsula. Another line connects Vela Luka with Split and the island of Lastovo. Fast passenger catamarans connect those two ports with Split, Dubrovnik and the islands of Hvar, Lastovo and Mljet.
According to legend, the island was founded by Trojan hero Aeneas or his friend Antenor.
The island was first settled by Mesolithic and Neolithic peoples. There is archaeological evidence at the sites of Vela Spila and at Jakas Cave near the village of Žrnovo. The findings at Vela Spila are on display at the Center for Culture in Vela Luka.