Piroa Falls is a 20-metre waterfall on the Ahuroa River within the Waipu Gorge Scenic Reserve, situated off State Highway 1 on the northern side of the Brynderwyn Hills in Northland, New Zealand.

The falls are reached via a 200-metre return track that descends through bush into the gorge via a series of steps, then crosses the Ahuroa River on a concrete slab bridge built by the Maungaturoto Rotary Club in 1983.

Note that this bridge submerges during periods of high rainfall and should not be crossed when the river is in flood. A swimming hole sits at the base of the falls.