The Yahooskin are a band of Snake Indians (Shoshone) comprising part of the federally recognized Klamath Tribes in Klamath County, Oregon. In 1864 they, along with the Klamath and Modoc, signed a treaty with the Federal government which established an Indian reservation in Southern Oregon for them, in exchange for their ceding a vast quantity of land.
They were assigned land on the Klamath Reservation in the Yainax area along the Sprague River. Traditionally they had inhabited the area now comprising Lake and Harney counties of Oregon, and hunted in the Klamath Basin.