Southbury Training School is a large residential facility in the towns of Southbury and Roxbury, Connecticut. It was built in the 1930s as a large state-funded and state-operated residential and habilitative facility for adults with intellectual disabilities. It consists of 125 buildings situated on a campus of 1,600 acres (6.5 km2). It independently operates its own power, heat, sewage treatment, water, laundry, fire, ambulance, public safety, building maintenance, transportation and dietary services. It is run by the Connecticut Department of Developmental Services. The facility is listed as an historic district on the National Register of Historic Places.