Oklahoma State Penitentiary is a maximum-security prison located in McAlester, Oklahoma. Established in 1908, it houses male inmates convicted of serious crimes. The facility is known for its high-security measures and has a capacity of over 1,000 inmates. The penitentiary features various programs aimed at rehabilitation, including educational and vocational training. It also has a history of notable inmates and has been the site of several significant events in the state's correctional history. The prison is operated by the Oklahoma Department of Corrections.