The Sac and Fox Nation of Missouri in Kansas and Nebraska is one of three federally recognized Native American tribes of Sac and Meskwaki (Fox) peoples. Their name for themselves is Nemahahaki and they are an Algonquian people and Eastern Woodland culture.

The Sauk or Sac are a group of Native Americans of the Eastern Woodlands culture group, who lived primarily in the region of what is now Green Bay, Wisconsin, when first encountered by the French in 1667. Their autonym is oθaakiiwaki, and their exonym is Ozaagii(-wag) in Ojibwe. The latter name was transliterated into French and English by colonists of those cultures. Today they have three federally recognized tribes, together with the Meskwaki (Fox), located in Iowa, Oklahoma and Kansas.