Ngāti Maru is a Māoriiwi of inland Taranaki in New Zealand. They are descended from Maruwharanui, a son of Hotunui. Te Upoko o te Whenua Marae is the iwi's marae near Tarata. The iwi has two trusts, Te Runanga o Ngati Maru (Taranaki) Trust (which replaced Ngati Maru Wharanui Pukehou Trust) and Ngati Maru (Taranaki) Fisheries Trust. The settlement of Purangi is within their area.
Another iwi named Ngāti Maru is based in Thames (Hauraki). They are descended from Maruwharanui's brother Marutūāhu. The descendants of a third brother, Marukōpiri, settled on the Whanganui river.