Chief Crazy Horse of the Oglala Lakota surrenders to United States troops in Nebraska.

The Oglala (pronounced [olala], meaning "to scatter one's own" in Lakota language) are one of the seven subtribes of the Lakota people who, along with the Dakota, make up the Ohthi akwi (Seven Council Fires). A majority of the Oglala live on the Pine Ridge Indian Reservation in South Dakota, the eighth-largest Native American reservation in the United States.

The Oglala are a federally recognized tribe whose official title is the Oglala Sioux Tribe (previously called the Oglala Sioux Tribe of the Pine Ridge Reservation, South Dakota). However, many Oglala reject the term "Sioux" due to the hypothesis (among other possible theories) that its origin may be a derogatory word meaning "snake" in the language of the Ojibwe, who were among the historical enemies of the Lakota. They are also known as Oglla Lakhta Oyte.

Crazy Horse (Lakota: Tȟašúŋke Witkó, IPA: [tχaˈʃʊ̃kɛ witˈkɔ], lit. ''His-Horse-Is-Crazy''; c. 1840 – September 5, 1877) was a Lakota war leader of the Oglala band in the 19th century. He took up arms against the United States federal government to fight against encroachment by white American settlers on Native American territory and to preserve the traditional way of life of the Lakota people. His participation in several famous battles of the Black Hills War on the northern Great Plains, among them the Fetterman Fight in 1866, in which he acted as a decoy, and the Battle of the Little Bighorn in 1876, in which he led a war party to victory, earned him great respect from both his enemies and his own people.

In September 1877, four months after surrendering to U.S. troops under General George Crook, Crazy Horse was fatally wounded by a bayonet-wielding military guard while allegedly resisting imprisonment at Camp Robinson in present-day Nebraska. He ranks among the most notable and iconic of Native American warriors and was honored by the U.S. Postal Service in 1982 with a 13¢ Great Americans series postage stamp.