Kujū-ku Islands (九十九島 Kujū-ku-shima) is a group of islands ranging in the west coast of Kitamatsuura Peninsula, Nagasaki Prefecture, Japan.
The Islands belong to the city of Sasebo, and the city of Hirado.
The total number of the islands is now formally considered to be 208. The whole area is designated part of Saikai National Park.