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The Clackamas Indians are a tribe of Native Americans of the U.S. state of Oregon who traditionally lived along the Clackamas River in the Willamette Valley. Lewis and Clark estimated their population at 1800 in 1806. At the time the tribe lived in 11 villages and subsisted on fish and roots.
Descendants of the Clackamas belong to the Confederated Tribes of the Grand Ronde Community of Oregon.
They are the technical owners of the Willamette Meteorite.
The now-extinct language spoken by the Clackamas is also known as Clackamas, and is one of the Chinookan languages, specifically a variety of Upper Chinook. It is closely related to the still-living (but highly endangered) Wasco-Wishram language, which is another variety of Upper Chinook.
See also 
Other Chinookans of the lower Columbia River:
- Snyder, Eugene E.. Portland Names and Neighborhoods: Their Historic Origin. Portland: Binford & Mort, 1979. p.110.