HM Prison Service

His Majesty's Prison Service (HMPS) is a part of HM Prison and Probation Service (formerly the National Offender Management Service), which is the part of His Majesty's Government charged with managing most of the prisons within England and Wales (Scotland and Northern Ireland have their own prison services: the Scottish Prison Service and the Northern Ireland Prison Service, respectively).

There are two Director General roles in HMPPS: Director General CEO, currently James McEwen, and Director General Operations, currently Michelle Jarman-Howe. The Director General CEO reports to the Ministry of Justice Permanent Secretary (Dr Jo Farrar) and works closely with both the Secretary of State for Justice and Prisons Minister, a junior ministerial post within the Ministry of Justice.

The statement of purpose for His Majesty's Prison Service states that "[His] Majesty's Prison Service serves the public by keeping in custody those committed by the courts. Our duty is to look after them with humanity and help them lead law abiding and useful lives in custody and after release". The Ministry of Justice's objective for prisons seeks "Effective execution of the sentences of the courts so as to reduce re-offending and protect the public".

It has its head office in 102 Petty France in London, and it had previous head offices in Clive House (also situation on Petty France) and Cleland House in the City of Westminster, London.

As of 2019, the recidivism rate in the UK is almost 50% after one year.