Yoncalla, sometimes called Southern Kalapuyan, is a Native American language in the Oregon Penutian family of languages, once spoken in southwest Oregon in the United States In the 19th century it was spoken by the Yoncalla band of the Kalapuya people in the Umpqua River valley. It is closely related to Central Kalapuyan and Northern Kalapuyan, spoken in the Willamette Valley to the north.
