HM Prison Woodhill is a Category A male prison, located in Milton Keynes, England. Woodhill Prison is operated by His Majesty's Prison Service. A section of the prison is designated as a Young Offenders Institution. A Secure Training Centre is located next to the prison. One of its main roles is that of a local prison serving the a Crown Court centre and magistrates' courts. The prison holds remand and sentenced prisoners aged 18 and above. In addition, Woodhill is one of the eight national high-security prisons, holding Category A prisoners, some in the "Close Supervision Centre".