Dease Lake is a small community located in the Cassiar Country of the Northern Interior of British Columbia, Canada. It is located a few hours south of the Yukon border on Stewart–Cassiar Highway (Highway 37) at the south end of the lake of the same name. Dease Lake is the last major centre before the Alaska Highway while driving north bound, and also the junction to Telegraph Creek and the Grand Canyon of the Stikine. Dease Lake Indian Reserve No. 9 is located nearby and is under the governance of the Tahltan First Nation band government.