基斯诺斯岛是希腊的岛屿，位于凯阿岛和塞里福斯岛之间，由南爱琴大区负责管辖，长21公里、宽8.6公里，面积100平方公里，海岸线长度约100公里，2009年人口1,538。

• Official website （英文） （希腊文）

Kythnos (Greek:Κύθνος) is a Greek island and municipality in the Western Cyclades between Kea and Serifos. It is 56 nautical miles (104 km) from the harbor of Piraeus. Kythnos is 100 km (39 sq mi) in area and has a coastline of about 100 km (62 mi). It has more than 70 beaches, many of which are still inaccessible by road. Of particular note is the crescent-shaped isthmus of fine sand at Kolona.