Flandreau Indian School

Flandreau Indian School (FIS), previously Flandreau Indian Vocational High School, is a boarding school for Native American children (primarily Lakota) in unincorporated Moody County, South Dakota, adjacent to Flandreau. It is operated by the Bureau of Indian Education (BIE) and is off-reservation.

It is one of four such off-reservation boarding schools directly operated by the BIE. It offers grades 9–12. Established in 1872 as a Presbyterian mission school, it is the oldest continuously operating Indian boarding school in the United States.