Waimakariri Falls is a 50-metre waterfall located on the Waimakariri River in Arthur's Pass National Park, Canterbury, on New Zealand's South Island.

It sits in a remote, steep-walled valley accessible via a demanding multi-hour hike from the outskirts of Arthur's Pass township. The route follows the river plains before climbing through a narrowing gorge past a series of extraordinary cascades.

The falls lie downstream from Waimakariri Falls Hut, a Canterbury Mountaineering Club hut that serves as the primary backcountry base in the area.

The surrounding terrain is rugged and avalanche-prone, and the location has no mobile phone reception, making careful trip planning essential.