Ts'ilʔos Provincial Park, Provincial park in Cariboo Regional District, Canada.

Tsʼilʔos Provincial Park is a 233,240-hectare provincial park in the Coast Mountains of British Columbia, in the Cariboo Regional District. It is centred on Tŝilhqox Biny (Chilko Lake) and its outlet, the Chilko River, and is ringed by peaks including Mount Tatlow, Monmouth Mountain and Mount Good Hope, at 3,242 m the park's highest point. It is a Category Ib wilderness area, reached by two access roads off Highway 20.

The area became a protected park in 1994 after a five-year planning process that addressed conflicts between conservation and resource use. This establishment marked an important shift toward preserving the region.

The Xeni Gwet'in say Ts'ilʔos, the mountain also called Mount Tatlow, is a man turned to stone at the world's creation who now watches over their people and territory. Pointing at or climbing the mountain is considered disrespectful and is believed to offend Ts'ilʔos, bringing severe weather changes.

Two main roads branch off Highway 20 to reach campgrounds in the northern region of the park. Visitors should come prepared for remote conditions and check conditions before traveling, especially during changing weather or winter.

The lake's name was officially changed in 2019 to Tŝilhqox Biny, replacing Chilko Lake. Sockeye salmon spawn along its shores, and the park's highest point is Mount Good Hope at 3,242 m. The park is classified as a Category Ib wilderness area.