Onerahi, for half a century known as Grahamtown, is a seaside suburb of Whangārei, New Zealand's northernmost city.

The New Zealand Ministry for Culture and Heritage gives a translation of "long beach" for Onerahi.

With Reipae believed to have alighted here, after over hearing Reitū and their kārearea discussing plans to solely marry the Te Rarawa chief, Ueoneone.

There are two concentric roads around the seaward plateau; the upper one surrounds the airport, and the lower follows the coast.

Close to the suburb in the harbour is Motu Matakohe or Limestone Island, now being managed to restore its ecosystems.

The land for the town was purchased by Henry Walton and William Smellie Graham from Te Tirarau in the mid-1860s.

It was built to provide access to a wharf in Onerahi and when coastal shipping declined severely in the 1930s, the railway was closed.

The Onerahi Central Cricket Club celebrated their 50th anniversary in 2006, highlighted by a re-run of their first game against Whangārei Boys' High School with best-of selections.