Pine Ridge is a census-designated place (CDP) and the most populous community in Oglala Lakota County, South Dakota, United States. The population was 3,138 at the 2020 census. It is the tribal headquarters of the Oglala Sioux Tribe on the Pine Ridge Indian Reservation.

Oglala Lakota County is a county in southwestern South Dakota, United States. As of the 2020 census, the population was 13,672. Oglala Lakota County does not have a functioning county seat; Hot Springs in neighboring Fall River County serves as its administrative center. The county was created as a part of the Dakota Territory in 1875, although it remains unorganized. Its largest community is Pine Ridge.