Ōmiha is a rural settlement on the southwest coast of Waiheke Island in the Auckland Region of New Zealand.^[3] The settlement began when the O'Brien brothers subdivided their farm in 1922, naming it "Omiha Beach Estate".^[4] The area is also known as Rocky Bay from the bay to the south.^[5] A proposal that the name change to Rocky Bay in 2017 met strong opposition^[6] and was rejected.^[7] The name Ōmiha, with the macron, became official in 2018.^[4]

Statistics New Zealand describes Ōmiha as a rural settlement, which covers 0.63 km² (0.24 sq mi)^[1] and had an estimated population of 570 as of June 2023,^[2] with a population density of 905 people per km². Ōmiha is part of the larger Waiheke East statistical area.^[8]

Ōmiha had a population of 492 at the 2018 New Zealand census, an increase of 108 people (28.1%) since the 2013 census, and an increase of 150 people (43.9%) since the 2006 census. There were 207 households, comprising 225 males and 261 females, giving a sex ratio of 0.86 males per female, with 72 people (14.6%) aged under 15 years, 60 (12.2%) aged 15 to 29, 243 (49.4%) aged 30 to 64, and 114 (23.2%) aged 65 or older.

Ethnicities were 88.4% European/Pākehā, 11.6% Māori, 9.1% Pacific peoples, 3.7% Asian, and 3.7% other ethnicities. People may identify with more than one ethnicity.

Although some people chose not to answer the census's question about religious affiliation, 65.9% had no religion, 20.1% were Christian, 0.6% were Hindu, 1.2% were Buddhist and 2.4% had other religions.

Of those at least 15 years old, 144 (34.3%) people had a bachelor's or higher degree, and 63 (15.0%) people had no formal qualifications. 75 people (17.9%) earned over $70,000 compared to 17.2% nationally. The employment status of those at least 15 was that 180 (42.9%) people were employed full-time, 63 (15.0%) were part-time, and 6 (1.4%) were unemployed.^[9]