Ōtāhuhu is a suburb of Auckland, New Zealand – 13 kilometres (8.1 mi) to the southeast of the CBD, on a narrow isthmus between an arm of the Manukau Harbour to the west and the Tāmaki River estuary to the east. The Auckland isthmus is the narrowest connection between the North Auckland Peninsula and the rest of the North Island, being only some 1,200 metres (3,900 ft) wide at its narrowest point, between the Ōtāhuhu Creek and the Māngere Inlet. As the southernmost suburb of the former Auckland City, it is considered part of South Auckland.

The suburb's name is taken from the Māori-language name of the volcanic cone known as Ōtāhuhu / Mount Richmond. The name refers to "the place of Tāhuhu" — the eponymous ancestor, Tāhuhu-nui-a-Rangi, of Ngāi Tāhuhu.

Ōtāhuhu covers 6.68 km (2.58 sq mi) and had an estimated population of 17,780 as of June 2024, with a population density of 2,662 inhabitants per square kilometre (6,890/sq mi).

Historical population

Year	Pop.	±% p.a.
2006	12,903	—
2013	13,566	+0.72%
2018	15,165	+2.25%
Source:

Ōtāhuhu had a population of 15,165 at the 2018 New Zealand census, an increase of 1,599 people (11.8%) since the 2013 census, and an increase of 2,262 people (17.5%) since the 2006 census. There were 3,921 households, comprising 7,815 males and 7,353 females, giving a sex ratio of 1.06 males per female, with 3,669 people (24.2%) aged under 15 years, 3,804 (25.1%) aged 15 to 29, 6,486 (42.8%) aged 30 to 64, and 1,194 (7.9%) aged 65 or older.

Ethnicities were 20.4% European/Pākehā, 15.3% Māori, 47.9% Pacific peoples, 28.8% Asian, and 1.7% other ethnicities. People may identify with more than one ethnicity.

The percentage of people born overseas was 46.1, compared with 27.1% nationally.

Although some people chose not to answer the census's question about religious affiliation, 21.0% had no religion, 51.2% were Christian, 1.9% had Māori religious beliefs, 9.4% were Hindu, 5.9% were Muslim, 2.3% were Buddhist and 3.1% had other religions.

Of those at least 15 years old, 1,413 (12.3%) people had a bachelor's or higher degree, and 2,574 (22.4%) people had no formal qualifications. 822 people (7.2%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 5,496 (47.8%) people were employed full-time, 1,323 (11.5%) were part-time, and 777 (6.8%) were unemployed.

Individual statistical areas

Name	Area (km)	Population	Density (per km)	Households	Median age	Median income
Ōtāhuhu Industrial	1.85	78	42	—	21.6 years	—
Ōtāhuhu Central	1.26	1,356	1,076	258	35.4 years	$22,900
Ōtāhuhu North	0.72	3,870	5,375	1,083	29.6 years	$22,600
Ōtāhuhu East	0.79	2,307	2,920	594	29.6 years	$27,500
Ōtāhuhu South West	1.24	3,888	3,135	966	29.6 years	$23,600
Ōtāhuhu South	0.82	3,666	4,471	1,017	30.8 years	$23,100
New Zealand					37.4 years	$31,800

The area is named after Tāhuhunui-o-te-rangi, captain of the Moekākara waka, and who settled on Ōtāhuhu and in Northland, his descendants becoming the Ngāi Tāhuhu iwi. Portage Road, which runs between the Manukau Harbour and Ōtāhuhu Creek, was originally Te Tō Waka, a portage for waka between the Manukau and Waitemata harbours. This portage is traditionally associated as the place where the Tainui waka was hauled between the Tamaki River and Manukau Harbour. In the early 1800s, the portage was used by Ngāpuhi during the Musket Wars, to attack Tainui tribes in the Waikato.

The suburb was established in 1847 as a fencible settlement, where soldiers were given land with the implied understanding that in wartime, they would be raised as units to defend it (however, the eventual fighting a decade later used professional soldiers instead). Most early features from this time have disappeared, however, such as the stone Tāmaki Bridge built by the fencibles that had to make way to a widening of Great South Road. By the 1870s, Ōtāhuhu became the largest agricultural town in the Auckland Province, facilitated by the trade of wheat and other agricultural products to the city of Auckland, trading along the Tāmaki River. In December 1873 the Southern Line opened, connecting the township of Auckland to Penrose. A year and a half later on 20 May 1875, the line was extended south and the Ōtāhuhu railway station was opened.

The first supermarket in the country was opened in Ōtāhuhu on 18 June 1958, when the first Foodtown was opened by Tom Ah Chee, who pooled his resources with two other Auckland produce shop owners, Norman Kent and John Brown. Many famous personalities went to Otahuhu College, including heavyweight boxing champion David Tua, former prime minister David Lange, and ex-Manukau City Mayor, Sir Barry Curtis.

Ōtāhuhu had a local government just like other suburbs of Auckland at that time. The local government was called Ōtāhuhu Borough Council, which started in 1912 and merged into Auckland City Council in 1985, eventually amalgamated into Auckland Council in November 2010.

• Alfred Sturges, 1912–1915
• James Atkinson, 1915–1917
• Alfred MacDonald, 1917–1921
• Robert Black Todd, 1921–1929
• Hubert Thomas Clements, 1929–1935
• Charles Robert Petrie, 1935–1944
• Albert Murdoch, 1944–1950
• James Deas, 1950–1954
• John "Jack" David Murdoch, 1954–1962
• Robert G. Ashby, 1962–1965
• Aubray Thayer Bedingfield, 1965–1970
• Claude H. D. Handisides, 1970–1977
• Niall Frederick Burgess, 1977–1985

Otahuhu College is a secondary school (years 9–13) with a roll of 1126.

Otahuhu Intermediate is an intermediate school (years 7–8) with a roll of 357.

Otahuhu School and Fairburn School are contributing primary schools (years 1–6) with rolls of 583 and 479 students, respectively.

McAuley High School is a state-integrated Catholic girls secondary school (years 9–13) with a roll of 769. St Joseph's School is a state-integrated Catholic full primary school (years 1–8) with a roll of 288. The schools are across the street from each other.

King's College is a private Anglican secondary school (years 9–13) with a roll of 1196. Years 9–11 are boys only, and years 12 and 13 are coeducational.

Mt Richmond School is a special school for students with intellectual disabilities. It has a roll of 197.

All these schools except McAuley High School and King's College (as noted above) are coeducational. Rolls are as of August 2024.

• Giac Nhien Temple, a Vietnamese Buddhist temple is located in the suburb.

Ōtāhuhu, in its position on a narrow section of the Auckland isthmus, is an important part of Auckland's southern transportation approaches for both road and rail, containing a combined bus interchange and Ōtāhuhu railway station. The new bus-train interchange opened on 29 October 2016 as a joint Auckland Transport and NZ Transport Agency initiative costing NZ$28M.

"The station is at the heart of the Southern New Network", said Auckland Transport's Chief AT Metro Officer, Mark Lambert. "Auckland is moving towards a more connected network of local feeder services connecting with frequent bus and train services. Bus and train transport hubs like Ōtāhuhu are at the heart of this transformation."

The old bus interchange, which was badly neglected, and had received increased attention from early 2011 on for vandalism/graffiti prevention measures is now closed and a smaller bus stop has been installed on the main road near the town centre.

Ōtāhuhu nowadays is synonymous with industry and along with its neighbouring suburbs Favona, Māngere East, Mt Wellington, Penrose and Westfield forms an industrial conglomerate zone that spans much of the Māngere Inlet. The community and town centre flourishes as the crossroad to Central and South Auckland and is home to a sizeable Pacific Island populace.

Ōtāhuhu is home to the Ōtāhuhu Rugby Football Club and the Otahuhu Leopards rugby league club.

• Photographs of Ōtāhuhu held in Auckland Libraries' heritage collections