Mac-Mac Falls is a dramatic twin-stream waterfall on the Mac-Mac River in the Mac-Mac Forest Nature Reserve, Mpumalanga, South Africa, standing approximately 65–70 metres high.

It ranks among the tallest waterfalls in the province and sits along the scenic Panorama Route near the town of Sabie.

Originally a single cascade, the waterfall was split into two streams during the 1870s gold rush, when miners blasted the rock face hoping to expose the gold-bearing reef beneath.

The area's name traces to that same era: President Thomas Burgers, amused by the concentration of Scottish prospectors with "Mac" surnames, christened the region Mac-Mac.

The falls were declared a Provincial Heritage Site in 1983, along with the indigenous forest in the gorge below.

A walkway leads visitors from the parking area to a viewing platform perched above the plunge pool, offering close-up views of the twin streams and the mist and rainbows they generate.

Nearby Mac-Mac Pools, upstream on the same river, provide a complementary stop with natural rock swimming pools.