Tainui was one of the great ocean-going canoes in which Polynesians migrated to New Zealand approximately 800 years ago. It was commanded by the chief Hoturoa, who had decided to leave Hawaiki because over-population had led to famine and warfare. The ship first reached New Zealand at Whangaparāoa in the Bay of Plenty and then skirted around the north coast of the North Island, finally landing at Kawhia in the western Waikato. The crew of the Tainui were the ancestors of the iwi that form the Tainui confederation.

According to Māori tradition, Hoturoa was the leader of the Tainui canoe, during the migration of the Māori people to New Zealand, around 1400. He is considered the founding ancestor of the Tainui confederation of tribes (iwi), who now inhabit the central North Island.