Slatechuck Mountain, known as Kaagan in the Haida language, is a summit on south-central Graham Island in Haida Gwaii, formerly known as the Queen Charlotte Islands of the North Coast of British Columbia, Canada. It is located about 9 km west of Queen Charlotte City, on Skidegate Inlet, and just south of Yakoun Lake, the island's largest lake, which is the source of the northward-flowing Yakoun River.