Chasm Provincial Park, Nature reserve in Thompson-Nicola Regional District, Canada.

Chasm Provincial Park protects the Painted Chasm, a gorge up to 300 metres deep, about 600 metres wide and 8 kilometres long, cut by glacial meltwater into a lava plateau of the Chilcotin Group over roughly 10 million years. Its walls show bands of red, brown, yellow and purple. Chasm Creek runs north to south through the gorge, and the park also takes in upland ponderosa pine, marshes and lakes.

The park was established in 1940 to protect the Painted Chasm, a gorge cut by glacial meltwater into a lava plateau of the Chilcotin Group over about 10 million years. Its boundaries changed several times before it was expanded to 3,067 hectares in 1995. Long before settlers arrived, the area served as hunting and fishing grounds for First Nations.

The park lies on the traditional settlement, hunting and fishing grounds of First Nations of the Interior Plateau, used long before settlers arrived and before the park was established in 1940. The name Chasm comes from the English word for a deep gorge, a plain description of the Painted Chasm that gave the park its purpose.

The park has no developed tourist infrastructure; only a simple picnic area is provided. The two viewpoints stand at the northern head of the chasm, where it cuts more than 100 m into the plateau. Access is from Highway 97 east of Clinton, between Clinton and 100 Mile House.

The Chasm's red, brown, yellow and purple walls reach an average of 300 metres high, cut into the 10-million-year-old lava of the Chilcotin Group. The gorge runs about 8 km long and 600 m wide, and the Cariboo Road and a Canadian National Railway line follow its northern apex.