The Montana Department of Corrections is a state agency of Montana that operates state prisons and manages community-corrections programs.

[1] Operated by the state, county government or private nonprofits under contract with the state.

The Youth Services Division operates juvenile correctional facilities.

[4] Pine Hills Youth Correctional Facility in unincorporated Custer County, near Miles City, serves delinquent boys.

[5] Riverside Youth Correctional Facility, a 20-bed facility for girls,[6] is located in Boulder.