Ohakune is a small town at the southern end of Tongariro National Park, close to the southwestern slopes of the active volcano Mount Ruapehu, in the North Island of New Zealand.

A rural service town known as New Zealand's Carrot Capital, Ohakune is a popular base in winter for skiers using the ski fields (particularly Turoa) of Mount Ruapehu and in summer for trampers hiking the Tongariro Alpine Crossing. Ohakune is also famous for its giant carrot sculpture on the main road into the town.

The Ngāti Rangi iwi say the Māori language name Ohakune comes from the phrase "he Ohakune ki te ao", which broadly means "an opening to a new world" and refers to the descent from Mount Ruapehu into the valley and swamps of the area. In 2019 the New Zealand Geographic Board changed the official name to Ōhakune, indicating that the first letter was a long vowel, but swiftly reverted to Ohakune without a macron when Ngāti Rangi objected.

The lands to the south and west of Mount Ruapehu were historically inhabited by the Māori of the Ngāti Rangi iwi.

Around the middle of the seventeenth century a marae at Rangataua, a small town about five kilometres south-east of Ohakune, was attacked and the inhabitants were driven from their homes by raiders from the Ngāti Raukawa, an iwi from farther east in Manawatū. Around 75 of the village's population were slain and the dozen or so survivors fled to Maungarongo and established a pā on the present site of the town of Ohakune.

The Crown purchased 10,000 acres of Native land at Ohakune in 1879.

In 1883, the first engineering reconnaissance commenced for the Marton—Te Awamutu section of the North Island Main Trunk Railway and a base was established upon the present site of Ohakune, soon becoming a permanent camp for railway and road construction workers. Settlement of the town commenced in the early 1890s around the confluence of the Mangawhero and Mangateitei rivers, along the road from Raetihi to Taumarunui. Forty quarter-acre sections in the township were sold at auction in February 1893. Prior to the completion of the railway to the town, all supplies had to be transported via cart from Hunterville, or from Whanganui via the Whanganui River steamer to Pipiriki and then by cart for the remaining distance. By March 1908 the railway line had reached Ohakune, with new development around the railway station to the northeast of the early settlement becoming known as Ohakune East and then Ohakune Junction. The period of railway construction activities was followed quickly by intensive timber milling; as the forest was cleared, cattle and sheep were introduced and farming progressed. Ohakune was constituted a town district in August 1908 and in November 1911 attained borough status.

The central North Island section of the North Island Main Trunk was the last part to be constructed. Prime Minister Sir Joseph Ward drove the last spike on 6 November 1908, and the 'Last Spike' monument is at Manganui-o-te-Ao, near Pokaka to the north of Ohakune. A two-day NIMT service started on 9 November 1908, with an overnight stop at Ohakune (for northbound passengers) or Taumarunui (for southbound passengers). On 14 February 1909, the first NIMT express left Auckland for Wellington, an overnight trip scheduled to take 19 hours 15 minutes, with a sleeping car, day cars with reclining seats, and postal/parcels vans. The dining car went on the north express from Wellington to Ohakune, then transferred to the southbound express, so avoiding the heavy gradients of the central section.