Rainbow Falls, Waterfall in Kerikeri, New Zealand.

Rainbow Falls, Māori name Waianiwaniwa, is a single-drop waterfall on the Kerikeri River north of Kerikeri. It falls 27 metres over a hard basalt layer beside softer mudstone, which water eroded to form the drop. A short walk from a signposted car park leads to the falls.

The falls cut through a hard basalt layer beside softer mudstone; the water wore away the mudstone to create the 27-metre drop. The Maori name Waianiwaniwa means 'waters of the rainbow', as translated by the Ministry for Culture and Heritage. The Kerikeri River Track links the falls to the Kerikeri Basin, where the Stone Store, Mission House and St James Church stand.

The Māori name Waianiwaniwa means "waters of the rainbow", a translation given by the Ministry for Culture and Heritage. The falls are reached by the Rainbow Falls Walk, which joins the 3.5 km Kerikeri River Track along the river's north bank. That track passes through kiwi habitat and stands of young kauri and tōtara on its way to the Kerikeri Basin.

The Rainbow Falls Walk reaches the falls in about 10 minutes; it then links to the Kerikeri River Track, a 3.5 km route of roughly 1.5 hours along the river's north bank to the Kerikeri Basin. Access is from a signposted walking car park off Rainbow Falls Road, reached from Waipapa Road. The track passes through kiwi habitat and regenerating kauri and tōtara.

The falls sit on a hard basalt layer beside softer mudstone; the water cut the mudstone away to form the 27-metre drop. A few hundred metres downstream to the west are the much less known Wharepoke Falls, which most visitors pass by.