Onehunga is a suburb of Auckland City in New Zealand and the location of the Port of Onehunga, the city's small port on the Manukau Harbour. It is eight kilometres south of the city centre, close to the volcanic cone of One Tree Hill (Maungakiekie).
Onehunga is a residential and light-industrial suburb. According to the 2006 census, there were 7,824 residents in Onehunga. There are almost 1,000 commercial and industrial businesses in the area. Onehunga stretches south from Royal Oak to the north shore of the Manukau Harbour. To the east are the areas of Oranga and Te Papapa; to the west, Hillsborough. On the southern shore of the Manukau Harbour, and linked to Onehunga by two bridges, is the suburb of Mangere Bridge.