The Hopi are a Native American ethnic group who primarily live on the Hopi Reservation in northeastern Arizona, United States. As of the 2010 census, there are 19,338 Hopi in the country. The Hopi Tribe is a sovereign nation within the United States and has government-to-government relations with the United States federal government. Particular villages retain autonomy under the Hopi Constitution and Bylaws. The Hopi language is one of 30 in the Uto-Aztecan language family. The majority of Hopi people are enrolled in the Hopi Tribe of Arizona but some are enrolled in the Colorado River Indian Tribes. The Hopi Reservation covers a land area of .
The Hopi encountered Spaniards in the 16th century, and are historically referred to as Pueblo people, because they lived in villages (pueblos in the Spanish language). The Hopi are thought to be descended from the Ancestral Puebloans (Hopi: Hisatsinom), who constructed large apartment-house complexes and had an advanced culture that spanned the present-day Four Corners region of the United States, comprising southeastern Utah, northeastern Arizona, northwestern New Mexico, and southwestern Colorado. The Ancient Puebloans lived along the Mogollon Rim, especially from the 12th–14th century, after which time their cultures seemed to have disappeared, but are thought to have contributed to modern Hopi and Pueblo communities.
The primary meaning of the word "Hopi" is "behaving one, one who is mannered, civilized, peaceable, polite, who adheres to the Hopi Way." Some sources contrast this to other warring tribes that subsist on plunder.
Hopi is a concept deeply rooted in the culture's religion, spirituality, and its view of morality and ethics. To be Hopi is to strive toward this concept, which involves a state of total reverence for all things, peace with these things, and life in accordance with the instructions of Maasaw, the Creator or Caretaker of Earth. The Hopi observe their traditional ceremonies for the benefit of the entire world.
Traditionally, Hopi are organized into matrilineal clans.