Motutapu Island (or simply Motutapu) is a 1,509 ha (3,730 acres) island in the Hauraki Gulf to the northeast of the city of Auckland, New Zealand. The island is part of the Hauraki Gulf Maritime Park.

Its full name, rarely used, is Te Motutapu a Taikehu, "The sacred island of Taikehu", Taikehu having been a tohunga (tribal priest) of the Tainui iwi. 'Motutapu', meaning "sacred" or "sanctuary" island, is a term used for various islands in a number of Polynesian cultures.