The Plains Apache are a small Southern Athabaskan group who live on the Southern Plains of North America, in close association with the linguistically unrelated Kiowa Tribe. Today, they are centered in Southwestern Oklahoma and are federally recognized as the Apache Tribe of Oklahoma. They mostly live in Comanche and Caddo County, Oklahoma.

Kiowa or Cáuigú IPA: [kɔ́j-gʷú]) people are a Native American tribe and an Indigenous people of the Great Plains of the United States. They migrated southward from western Montana into the Rocky Mountains in Colorado in the 17th and 18th centuries, and eventually into the Southern Plains by the early 19th century. In 1867, the Kiowa were moved to a reservation in southwestern Oklahoma.