The Hunua Ranges are an area of hilly country to the southeast of Auckland in New Zealand's North Island. They cover a roughly square area of some 400 km ² and rise to 650 metres.

They are located 40 kilometres southeast of Auckland, above the western shore of the Firth of Thames, and form a natural barrier between the waters of the firth and Hauraki Gulf, and the Waikato Plains to the southwest.

The ranges are sparsely populated, and most of them lie within the boundaries of the Waharau Regional Park. The conurbation of four cities that is the Auckland metropolitan area gets much of its water from reservoirs within the Hunua Ranges.