A historical development of the Chilocco Indian School, Chilocco, Oklahoma, is presented in this master's thesis. Three periods were chosen to develop the history of the school: The Critical Period (1884-1902), The Middle Period (1902-1926), and The Recent Period (1926-1956). Within each of these periods activities of the school's superintendents; changes in the curriculum and make-up of the student body; and administrative, curriculum, and student problems are presented. Characteristics of the Indian students, efforts exerted toward school and plant planning, and curriculum development are also considered. (SW)