Nandewar (code NAN), an interim Australian bioregion, is located in New South Wales and Queensland, and comprises an area of , surrounded by the Brigalow Belt South to the west, south-west and north-west, and to the east by the New England Tablelands. This is a region of hills on Palaeozoic sediments and lithosols and of Eucalyptus albens woodlands and summer rainfall.
In the IBRA system Nandewar has the code of NAN, and it has four sub-regions: