Millstream Falls National Park, National park with double waterfalls in North Queensland, Australia.

Millstream Falls National Park covers 3.72 km2 west of Ravenshoe in Far North Queensland. Its stream, a tributary of the Herbert River, drops at Big Millstream Falls, the widest single-drop waterfall in Australia, and again at Little Millstream Falls. Three lava flows from eruptions 3 to 1.2 million years ago are visible in the walls of the gorge at the big falls.

Millstream Falls National Park was gazetted on 19 June 1909, making it the first national park in northern Queensland. The falls owe their form to volcanic eruptions between 3 and 1.2 million years ago, when three lava flows covered the area; the oldest flow, about 3 million years old, lies at the valley floor, the youngest, about 1.2 million years old, on the upper slopes. All three flows are visible at Big Millstream Falls.

The park lies in the traditional country of the Jirrbal people, and the falls and surrounding eucalypt forest are part of that living cultural landscape. The name Yindinji is not recorded in the park's official sources, so visitors should rely on Jirrbal accounts and local signage rather than the older claim.

Access to Big Millstream Falls branches off the Kennedy Highway 4 km south of Ravenshoe; Little Millstream Falls are reached via Tully Falls Road. The park lies about 60 km west of Innisfail and 85 km southwest of Cairns. Neighbouring parks are Tully Falls, Malaan and Mount Hypipamee.

Three separate lava flows, the oldest about 3 million years old and the youngest about 1.2 million, are visible in the walls of Big Millstream Falls. The falls were formed when eruptions covered the area in basalt; the oldest flow lies at the valley floor, the youngest on the upper slopes.