Lake Hauroko is located in a mountain valley in Fiordland National Park in the South Island of New Zealand. The long s-shaped lake is 40 kilometres in length and covers and area of 63 km2. The surface is at an altitude of 150 metres above sea level.
One of the country's southernmost lakes, it is 35 kilometres northwest of Tuatapere, between the similarly-sized lakes Monowai and Poteriteri. It drains via the 20 kilometre-long Wairaurahiri River into Foveaux Strait 10 kilometres to the west of Te Waewae Bay.
