Central Kalapuyan, or Santiam, was a Kalapuyan language indigenous to the central and southern Willamette Valley in Oregon in the United States. It was spoken by various bands of the Kalapuya peoples who inhabited the valley up through the middle of the 19th century. The language is closely related to Northern Kalapuya, spoken in the Tualatin and Yamhill valleys. Dialects of Central Kalapuya that have been identified include:
Ahantchuyuk dialect, spoken in the northeastern Willamette Valley along the Pudding and Molalla rivers
Santiam dialect, spoken in the central Willamette Valley along the lower Santiam River
Luckiamute dialect, spoken in the central Willamette Valley along the Luckiamute River
Chepenafa dialect, spoken in the central Willamette Valley along Marys River
Chemapho dialect, spoken in central Willamette Valley along Muddy Creek.
Chelamela dialect, spoken in the southwestern Willamette Valley along the Long Tom River
Tsankupi dialect, spoken in the southeastern Willamette Valley along the Calapooia River
The phonology of the Santiam dialect, as described by Jacobs (1945) and analyzed by Banks (2007), is listed below. Banks notes that Jacobs' analysis does not rigorously account for allophonic variation, and that, according to Jacobs, there may have been some interchangeability between the velar and uvular series.