Hauhungatahi is an eroded andesitic volcano at the southern end of the Taupō Volcanic Zone in New Zealand, located about 12 kilometres (7 mi) north–west of Mount Ruapehu.

[2]: 179  The age of the erupted lava near the youngest cone is about 900,000 years, making Hauhungatahi more than three times as old as the neighbouring Ruapehu.

[2]: 184  The rock composition and age is more similar to Titiraupenga and Pureora in the western region of the Taupō Volcanic Zone than the nearby Ruapehu.

[5]: 287  The freshwater crayfish (koura) is found in the Waimarino Stream right up to the 1,246 m (4,088 ft) alpine plateau, but has not recolonised so high on the nearby active volcanoes such as Mount Ruapehu.

[7]: 26  The current cover on its slopes has four zones: The standard ascent route on Hauhungatahi was a tramp from the west side starting near Erua, following remnants of an old track in places, and bush-bashing through several overgrown and boggy areas to reach the bush line near 1,200 metres (3,900 ft) on the summit plateau; this route is no longer available as it crosses private land.