Ōmaha is a small beach town on Ōmaha Bay in the Auckland Region, in the north of New Zealand. It is located 74.7 km north of central Auckland. It is on a sandspit that adjoins Tāwharanui Peninsula and separates Whangateau Harbour from Ōmaha Bay. The nearest sizeable town is Warkworth which is situated 16.8 km south west of Ōmaha.

Tāwharanui Peninsula is a finger of land projecting into the Hauraki Gulf from the east coast of the much larger North Auckland Peninsula of New Zealand. It separates Ōmaha Bay to the north from Kawau Bay and Kawau Island to the south. The nearest sizable town is Warkworth.