Rat Island is an island off the coast of Western Australia.

[1] It is a part of the Easter Group of the Houtman Abrolhos.

[2][3] It has been identified as a significant bird site.

[4][5][6][7][8] The jetty at the island had a railway line in the early 1900s, that had been utilized for some time during the exploitation of guano and lime deposits.

[9][10][11] Rat Island is the location of Albrohos Rat Island Airport (ICAO: YRAT).