The Luiseño language is a member of the Uto-Aztecan language family, primarily spoken by the Luiseño people in Southern California. It is traditionally used by the indigenous communities in the region, particularly around the San Luis Rey River and the surrounding areas. Efforts to revitalize the Luiseño language have been ongoing, with programs aimed at teaching it to younger generations. This includes language classes and the development of educational materials to preserve the cultural heritage of the Luiseño people.