Barrier Falls is a waterfall located in the Hawdon Valley area of Arthur's Pass National Park on the South Island of New Zealand, situated on or near Sudden Valley Stream where it meets the Hawdon River drainage.

It lies within a scenic gorge reached via a roughly two-hour walk from the Mt White Station or Hawdon Valley Shelter trailhead.

The approach follows a track through the gorge, crossing the Hawdon River — where a gate in an electric fence marks the crossing point — and navigating rocky terrain with several shallow stream crossings.

Cairns and orange markers guide walkers where the route enters bush. The falls are noted for significant water volume, though their exact height has not been formally recorded.