Cairns Bay is a rural locality in the local government area (LGA) of Huon Valley in the South-east LGA region of Tasmania.

The locality is about 25 kilometres (16 mi) south-west of the town of Huonville.

The 2016 census recorded a population of 76 for the state suburb of Cairns Bay.

[2] The waters of the Huon River estuary form the eastern boundary.

[3] Route C634 (Scotts Road) runs through from north-west to south.