HM Prison Peterborough is a Category B private prison for men, and a closed prison for women and female young offenders, located in Peterborough, Cambridgeshire, England. The prison is operated by Sodexo Justice Services, and is the only dual purpose-built prison holding males and females in the United Kingdom. The prison, which has a population of around 1,100 inmates, comprises four large wings, each with a separate housing arrangement for female detainees and male detainees. It is managed by the Newton Secure Training Centre (NSTC), and the associated training centre, which operates under Sodexo Services, comprises 26 housing units, ranging from 12-storey purpose built units to 10-storey semiprivate accommodation units.