Si Tanka University is an unaccredited private online university headquartered in Eagle Butte, South Dakota, United States.
Chartered by Sioux Tribe in 1973, Si Tanka University started as the Cheyenne River Community College.
The college then changed its name in July 1999 to honor one of its leaders, Si Tanka (Bigfoot).
Si Tanka/Huron University was notified in February 2002 that its accreditation had been approved by the Higher Learning Commission of the North Central Association of Colleges and Schools.
Due to financial difficulties, Si Tanka University was closed in 2006.