Clack Island is part of the Great Barrier Reef Marine Park at the tip of Cape Melville, Queensland in Bathurst Bay, Australia.

It is north-east of Denham Island and Flinders Island in the Flinders Group National Park. It is around 21 hectares or 0.21 square km in size,

Clack Island has a major place in Aboriginal ritual and mythology, and also has a large number of paintings. It is the traditional centre for male ritual activities and is the resting-place of the two culture heroes, Itjibiya and Almbarrin, who are the dominant figures of traditional mythology in the region.