Navajo or Dené / Dineh ("The People") is a Native American tribe in northeastern Arizona, USA, whose language belongs to the Athabaskan language family. Their language is called Dené bizaad.

The tribe lives in the Navajo Reservation, which covers northeastern Arizona, the United States and extends into New Mexico and Utah. The original name of their country is Dinétah. According to the 2000 census, there are 298,215 Navajo in the entire United States. They are closely related to the Apache Indians and are native to Canada. It is believed that they settled in the southwest in the 16th century. In the 17th century, they became cattle ranchers.

Navajo came into conflict with the Spanish colonists and later the Mexicans in the late 18th century and early 19th century. Their contact with the Spaniards was limited but important as the Spaniards introduced horses, sheep and goats, which became a vital part of the Navajo economy.