Giant Gate Falls is a roughly 30-metre waterfall on the Milford Track in Fiordland, New Zealand, reached via a 5. 5 km walk from Sandfly Point near Milford Sound.

The falls cascade down a glacial step — a rocky shelf left behind as glaciers retreated at the end of the last Ice Age — producing a thundering, fast-flowing cascade with water carrying a slight natural tint from surrounding vegetation and fine glacial silt.

The falls are best viewed from a swing bridge spanning the Arthur River, which offers a close-up, photogenic perspective uncommon among Fiordland's many waterfalls. A pool at the base makes it a popular rest stop along the track.

The surrounding landscape features ancient canopy trees, emerald ferns, and the nearby shores of Lake Ada.