Kathlamet
| Total population | |
|---|---|
| merged into Chinook Indian Nation | |
| Regions with significant populations | |
| Columbia River, Washington, U.S. | |
| Languages | |
| Kathlamet language, a Chinookan language | |
| Related ethnic groups | |
| Wahkiakum | 
The Kathlamet people are a tribe of Native American people with a historic homeland along the Columbia River in what is today southwestern Washington state. The Kathlamet people originally spoke the Kathlamet language, a dialect or language of the Chinookan language family. They were also called "Guasámas, or Guithlamethl, by the Clackamas", and "Kwillu'chini, by the Chinook."