The Piegan are an Algonquian-speaking people from the North American Great Plains. They are the largest of three Blackfoot-speaking groups that make up the Blackfoot Confederacy; the Siksika and Kainai are the others. The Piegan dominated much of the northern Great Plains during the nineteenth century.

Plains Indians or Indigenous peoples of the Great Plains and Canadian Prairies are the Native American tribes and First Nation band governments who have historically lived on the Interior Plains of North America. While hunting-farming cultures have lived on the Great Plains for centuries prior to European contact, the region is known for the horse cultures that flourished from the 17th century through the late 19th century. Their historic nomadism and armed resistance to domination by the government and military forces of Canada and the United States have made the Plains Indian culture groups an archetype in literature and art for Native Americans everywhere.