Sušac (dry island) is a small rocky island in the Adriatic Sea with an area of 4.03 km², and 16.4 km of coastline southwest of Korčula and Lastovo, on the halfway to the island of Vis, in Croatia. The coast consists of slopes and cliffs over 100 m tall, but the opposite side features a natural harbour. A 19th-century lighthouse is built on top of the island.