Ariki Falls is a wide, low cataract on the Buller River, located within the Buller Gorge Swingbridge Adventure and Heritage Park near Murchison in New Zealand's Tasman District.

Standing roughly 5 metres high in medium flow, it is more accurately described as a powerful rapid than a conventional waterfall — in flood conditions the drop can disappear entirely as the river rises dramatically.

The falls are reached via a one-hour return walk through unspoilt native forest from the park's famous swing bridge, the longest in New Zealand.

The track passes remnants of old mining activity and the White Creek fault line before arriving at a viewpoint above the churning water.

Ariki Falls is considered one of the most challenging commercially rafted drops on the Buller River, and the section between Murchison and Newton Flat is also popular with experienced whitewater kayakers.