Kadan Island () is the largest island in the Mergui Archipelago, Myanmar. Its area is . The highest point is French Bay Peak (), which is the highest point in the archipelago.
Under the British, the island was known as King Island, King's Island, and later as Kadan Kyun or Kadan Island, based on the local pronunciation.
Among the communities on Kadan Island are Gyindaungchaung, Kabingyaung, Kapa, Kyataw, Mayanchaung, Tharawuntaungnge and Yemyitkyi.