The Klamath are a Native American tribe of the Plateau culture area in Southern Oregon.

Before the arrival of European explorers, the Klamath people live in the area around the Upper Klamath Lake and the Klamath, Williamson, and Sprague rivers.

They subsist primarily on fish and gather roots and seeds.The Klamath are known to raid neighboring tribes (such as the Achomawi on the Pit River), and occasionally to take prisoners as slaves.

They trade with the Chinookan people at The Dalles.The Klamath people are grouped with the Plateau Indians—the peoples who originally lived on the Columbia River Plateau.

They are most closely linked with the Modoc people.The Klamath speak one dialect of the Klamath–Modoc language, the other being spoken by the Modoc people, who live south of the Klamath.

Once thought to be a language isolate, Klamath–Modoc is now considered a member of the Plateau Penutian language family.