Tatlatui Provincial Park, Provincial park in the Skeena Mountains, British Columbia, Canada

Tatlatui Provincial Park is a large protected area in the Peace River region spanning 105,829 hectares of wilderness. The landscape features rivers, glacial valleys, and mountain peaks that rise above 2,372 meters in elevation.

Tatlatui Provincial Park was established on 18 May 1973; later legislation changed both its protection status and its size, expanding it to its present 105,829 hectares. It lies east of Highway 37, and its northwestern section borders the Spatsizi Plateau Wilderness Provincial Park. Together with Stikine River Provincial Park, Mount Edziza Provincial Park and other protected areas, it forms the Stikine Country Protected Area.

The park lies in the traditional territory of the Tahltan, whose name is preserved in Tatlatui Lake and Tatlatui Peak inside the park. The Firesteel River drains the park north into the Finlay and Peace rivers, so its waters reach the Arctic Ocean, unlike the neighbouring Stikine parks, which drain to the Pacific.

Access to the park requires floatplane transportation, as the nearest major highway stands over 180 kilometers away from the park boundaries. Visitors should plan accordingly since flying is the only practical way to reach this location.

The park contains water sources that form the Firesteel River headwaters, which flows through multiple waterways before reaching the Arctic Ocean. This continuous water system links the remote mountain wilderness to distant coastal regions.