The Nez Percé (; autonym in Nez Perce language: Nimíipuu, meaning "we, the people") are an Indigenous people of the Plateau who are presumed to have lived on the Columbia River Plateau in the Pacific Northwest region for at least 11,500 years.Members of the Sahaptin language group, the Nimíipuu were the dominant people of the Columbia Plateau for much of that time, especially after acquiring the horses that led them to breed the appaloosa horse in the 18th century.

Prior to first contact with Western civilization the Nimiipuu were economically and culturally influential in trade and war, interacting with other indigenous nations in a vast network from the western shores of Oregon and Washington, the high plains of Montana, and the northern Great Basin in southern Idaho and northern Nevada.French explorers and trappers indiscriminately used and popularized the name "Nez Percé" for the Nimíipuu and nearby Chinook. The name translates as "pierced nose", but only the Chinook used that form of body modification.Cut off from most of their horticultural sites throughout the Camas Prairie by an 1863 treaty (subsequently known as the "Thief Treaty" or "Steal Treaty" among the Nimiipuu), confinement to reservations in Idaho, Washington and Oklahoma Indian Territory after the Nez Perce War of 1877, and Dawes Act of 1887 land allotments, the Nez Perce remain as a distinct culture and political economic influence within and outside their reservation.As a federally recognized tribe, the Nez Perce Tribe of Idaho govern their Native reservation in Idaho through a central government headquartered in Lapwai known as the Nez Perce Tribal Executive Committee (NPTEC). They are one of five federally recognized tribes in the state of Idaho. The Nez Perce only own 12% of their own reservation and some Nez Perce lease land to farmers or loggers. Today, hatching, harvesting and eating salmon is an important cultural and economic strength of the Nez Perce through full ownership or co-management of various salmon fish hatcheries, such as the Kooskia National Fish Hatchery in Kooskia or the Dworshak National Fish Hatchery in Orofino.Some still speak their traditional language, and the Tribe owns and operates two casinos along the Clearwater River (in Kamiah and east of Lewiston), health clinics, a police force and court, community centers, salmon fisheries, radio station, and other things that promote economic and cultural self-determination.