Biševo is an island in the Adriatic Sea in Croatia. It is situated in the middle of the Dalmatian archipelago. It is area is 5.8 km² and it has a population of 100.

The tiny islet of Bisevo is only 5 nautical miles southwest of Komiza on Vis Island. Covering 6 sq km, it would hardly be noticed at all except for its remarkable Blue Grotto (Modra Spilja) or Blue Cave which strongly suggests the famous Grotto of Capri. Of about ten caves scattered around Bisevo’s coast, the Blue Cave is the most outstanding. Although long known to fishermen, the cave has only been accessible to the non-diving public since 1884 when an entrance large enough for a boat was formed by blasting a hole in the rock.