Long Creek Youth Development Center is a secure juvenile facility in South Portland, Maine. It is operated by the Maine Department of Corrections and serves both detained youth awaiting court proceedings and youth committed to juvenile correctional custody.

The department describes Long Creek as Maine's only secure juvenile facility. Committed youth may remain there for an indeterminate period up to age 21. The facility is located at 675 Westbrook Street in South Portland and includes detention, correctional, education, and treatment functions (Maine Department of Corrections).

Long Creek is the current name of a state juvenile-corrections institution with roots in the nineteenth-century Maine State Reform School. Secondary summaries describe later names including State School for Boys, Boys Training Center, and Maine Youth Center before the Long Creek name was adopted in 2001 (Long Creek Youth Development Center overview).