South Auckland is an imprecisely defined area of Auckland, New Zealand, often stereotyped as a socio-economically disadvantaged, and sometimes rough, urban area with a relatively large Polynesian and Māori population. The name South Auckland is not an official place name but is in common use by New Zealanders. It is also used in the names of some organisations and companies.

Since the 1970s the term "South Auckland" has had negative connotations with outsiders, being associated with deprivation, crime and violence. When street crime occurs in the area, the mass media tend to use the generic "South Auckland" phrase, with its vague and unfortunate stereotypes, rather than the correct name of a suburb or territorial authority. Previous Manukau City mayor Barry Curtis tried to discourage use of the name because of its negative connotations. Many South Auckland youth, however, use the name with pride.

The heart of South Auckland is the low socio-economic suburbs of Manukau City, typified by Otara but including Papatoetoe, Mangere and Manurewa. Broadly speaking, South Auckland is the urban area stretching from at the very least the narrowing of the Auckland isthmus at Otahuhu, southwards through the Manukau City suburbs lying to the west and near east of Auckland's Southern Motorway (State Highway 1). The area does not include the more well-to-do, eastern and northern Manukau City suburbs such as Howick or Pakuranga, nor the large rural area of Manukau City. The name does not include Franklin District, which lies south of Papakura.

The Auckland metropolitan area ( /ˈɔːklənd/, AWK-lənd), in the North Island of New Zealand, is the largest and most populous urban area in the country with 1,377,200 residents, 31 percent of the country's population. Auckland has the largest Polynesian population of any city in the world. In Māori Auckland's names are Tāmaki Makaurau, and the transliterated version of Auckland, Ākarana.

The 2011 Mercer Quality of Living Survey ranked Auckland 3rd equal place in the world on its list, while the Economist's World's Most Livable Cities index of 2011 ranked Auckland in 9th place. In 2010, Auckland was classified as a Beta World City in the World Cities Study Group’s inventory by Loughborough University.

Auckland lies between the Hauraki Gulf of the Pacific Ocean to the east, the low Hunua Ranges to the south-east, the Manukau Harbour to the south-west, and the Waitakere Ranges and smaller ranges to the west and north-west. The central part of the urban area occupies a narrow isthmus between the Manukau Harbour on the Tasman Sea and the Waitemata Harbour on the Pacific Ocean. It is one of the few cities in the world to have harbours on two separate major bodies of water.