The Weiti River is an estuarine river to the north of Auckland in the North Island of New Zealand. It rises as the Weiti Stream in the low hills approximately 7km west of Silverdale and emerges into the Hauraki Gulf immediately south of the Whangaparaoa Peninsula. The upper stretches of the river are heavily grown with mangroves but with care, small craft can navigate it as far as Silverdale at high tide.