The Southern Ute Indian Reservation is an Indian reservation in southwestern Colorado, United States, near the northern New Mexico state line. Its territory consists of land from three counties; in descending order of surface area they are La Plata, Archuleta, and Montezuma Counties. The reservation has a land area of 1,058.785 sq mi (2,742.24 km²). Its largest communities are Ignacio and Arboles. The only other community that is recognized as a separate place by the Census Bureau is the CDP of Southern Ute, which lies just southeast of Ignacio.

The Town of Ignacio is a Statutory Town in La Plata County, Colorado, United States. The population was 852 at the 2020 United States Census. It is the headquarters of the Southern Ute Indian Reservation.