Cumborah is a town in north-western New South Wales, Australia. The town is in the Walgett Shire local government area, near the opal fields of Lightning Ridge. Cumborah is about 36 kilometres (22 mi) of the Castlereagh Highway and is served by the commercial centres of Lightning Ridge and Walgett, 48 kilometres (30 mi) to the south-east.
The road through Cumborah is main route to the nearby Glengarry, Grawin and Sheepyard opal fields. Other prospectors also search nearby for agate, fossils, petrified wood, topaz and other semi-precious stones. The village is almost surrounded by mulga and cypress scrubland.