Mendooran (pronunciation: men-door-an) is a small town adjacent to the Castlereagh River in the Warrumbungle Shire of central western New South Wales, Australia.

A bridge was erected over the Castlereagh River in 1869 which increased the road traffic and contributed to local development.

It also hosts an annual Raceday Festival in September that sees the town population swell to above 300 as race-goers from around the world visit.

The town is mentioned in Banjo Paterson's poem 'The Travelling Post Office' (1894): The roving breezes come and go, the reed beds sweep and sway, The sleepy river murmurs low, and loiters on its way, It is the land of lots o' time along the Castlereagh.

The old man's son had left the farm, he found it dull and slow, He drifted to the great north-west where all the rovers go.

Since 2022, the Central West Bike Trail has become a popular activity that includes Mendooran as one of many local towns on the route.

The Central West Cycle trail links the major towns of Mudgee, Dubbo and Wellington and a handful of smaller ones including Gulgong, Dunedoo, Mendooran and Ballimore.