The Gamilaroi Nature Reserve is a protected nature reserve, part of the southern Brigalow Belt, that is located in the North West Slopes region of New South Wales, in eastern Australia.

The 113-hectare (280-acre) reserve is situated 48 kilometres (30 mi) southeast of Moree, and about 6 kilometres (3.7 mi) south of Terry Hie Hie, at an elevation of 340 metres (1,120 ft) above sea level.

Other interesting plant species occurring here are the wilga, white box, belah and mock olive.

Rainfall is around 600 millimetres (24 in) per year, soils are a sandy red clay, derived from a re-crystallised quartzite-ferruginous sandstone.

Threats to the reserve include clearing of vegetation, fire, weeds, genetic decline of the ooline, as well as damage and browsing by feral pigs and goats.