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: