Gunderbooka County, New South Wales is one of the 141 Cadastral divisions of New South Wales. The Warrego River is the western boundary, and the Culgoa River and Darling River is the south-eastern boundary. It includes the area down to where the Warrego meets the Darling, to the north of Bourke (including North Bourke).
Gunderbooka is believed to be derived from a local Aboriginal word and is also the name of Gundabook Station.