|Native to||Olympic Peninsula, Washington|
|Extinct||3 imperfect speakers in 1890|
The Chemakum language (//; also written as Chimakum or Chimacum) was spoken by the Chemakum, a Native American group that once lived on western Washington state's Olympic Peninsula. It was very similar to the Quileute language, the only surviving Chimakuan language. In the 1860s, Chief Seattle and the Suquamish people killed many of the Chimakum people. In 1890, Franz Boas found only three speakers, and they spoke it imperfectly. A few semi-speakers continued until the 1940s on the east side of the Olympic Peninsula, between Port Townsend and Hood Canal.
Chemakum had three vowels, long and short, and lexical stress. It had the following consonants. (Note the unusual lack of plain velar consonants.)
- Ruby, Robert H.; John Arthur Brown (1992). A Guide to the Indian Tribes of the Pacific Northwest. University of Oklahoma Press. pp. 22–23, 28. ISBN 9780806124797.
- Hammarström, Harald; Forkel, Robert; Haspelmath, Martin; Bank, Sebastian, eds. (2016). "Chimakum". Glottolog 2.7. Jena: Max Planck Institute for the Science of Human History.