otahuhu () is a suburb of auckland, new zealand - to the southeast of the cbd, on a narrow isthmus between an arm of the manukau harbour to the west and the tamaki river estuary to the east. the isthmus is the narrowest connection between the north auckland peninsula and the rest of the north island, being only some wide at its narrowest point, between the otahuhu creek and the mangere inlet. as the southernmost suburb of the former auckland city, it is considered part of south auckland.