Coonamble is a town on the central-western plains of New South Wales, Australia. It lies on the Castlereagh Highway north-west of Gilgandra. At the 2016 census, Coonamble had a population of 2,750. It is the regional hub for wheat growing and sheep and wool. The name for the town is taken from the Gamilaraay word guna (faeces) and -bil.

Castlereagh Highway is a 790-kilometre (490 mi) state highway located in New South Wales and Queensland, Australia. From north to south the highway traverses South West Queensland and the North West Slopes, Orana, and Central West regions of New South Wales.