The Blackfoot people are a North American Indian tribe composed of three closely related bands: the Piegan (officially spelled Peigan in Canada), or Piikuni; the Blood, or Kainah (also spelled Kainai, or Akainiwa); and the Siksika, or Blackfoot proper (often referred to as the Northern Blackfoot). They traditionally lived in what is now Alberta, Canada, and the U.S. state of Montana, and there they remain, with one reservation in Montana and three reserves (as they are called in Canada), one for each band, within Alberta. The Blackfoot in the United States are officially known as the Blackfeet Nation, though the Blackfoot word siksika, from which the English name was translated, is not plural.

It is important to note that the term "Blackfoot" has also been used by some African Americans to describe their supposed Native American heritage, but this usage is not related to the Blackfoot people of North America.