Otahuhu is a suburb of Auckland, New Zealand under the local governance of the Auckland City Council. It is located 14 kilometres to the southeast of the city centre, on a narrow isthmus between an arm of the Manukau Harbour to the west and the Tamaki River estuary to the east, and as such is an important part of Auckland's southern transportation approaches for both road and rail, containing a major bus terminus. It is the southernmost suburb of Auckland City and is considered part of South Auckland.

Prices at the Otahuhu node are used as an indicator of prices in the upper North Island. Otahuhu is one of the three key reference nodes along with Haywards and Benmore.