Tuahiwi is a small New Zealand settlement located between Woodend and Rangiora. It is 6 kilometres (3.7 mi) north of Kaiapoi. The settlement includes Tuahiwi Marae, a marae (tribal meeting ground) of Ngāi Tahu and its Te Ngāi o Tūāhuriri Rūnanga branch. The marae includes the Māhunui II wharenui (meeting house).