Onetangi is a settlement on the north coast of Waiheke Island in New Zealand.

It has a long white-sand beach fronting onto Onetangi Bay.

[3] The name means "Weeping Sands" in the Māori language, and comes from a battle at Putiki o Kahu pā in 1821 during the Musket Wars.

The results were 89.5% European (Pākehā); 13.4% Māori; 4.4% Pasifika; 3.9% Asian; 3.3% Middle Eastern, Latin American and African New Zealanders (MELAA); and 2.2% other, which includes people giving their ethnicity as "New Zealander".

[10] Of those at least 15 years old, 399 (33.8%) people had a bachelor's or higher degree, 522 (44.2%) had a post-high school certificate or diploma, and 261 (22.1%) people exclusively held high school qualifications.