His Majesty's Prison Belmarsh is a Category A men's prison located in Thamesmead, south-east London, England. Belmarsh Prison is run by His Majesty's Prison Service and is situated next to HMP Isis and HMP Thameside. The prison is used for high-profile prisoners, particularly those concerning national security. Within the grounds of the prison is the High Security Unit (HSU), consisting of 48 single cells.
Belmarsh is nicknamed "Hellmarsh," owing to the high number of physical and authority abuses reported by both the prison's inmates (including former politician Jeffrey Archer, who coined the name and was imprisoned there for two years for perjury), and human rights activists.
In 1991, the armed robber Ronnie Field, an associate of London gangland boss Joey Pyle, was the first person to be held in Belmarsh's High Security Unit, shortly followed by members of the Arifs, a south-east London-based Turkish Cypriot gang, and those convicted of the £10 million Heathrow airport diamond heist.
It is often used for detention for terrorist-related offences. In September 2006, 51 such prisoners were held.
In 2009, an archaeological dig on the site led to the discovery of a nearly 6,000-year-old wooden trackway, which, behind Sweet Track near Glastonbury is the second oldest discovered in the British Isles.
In November 2009, an inspection report from the Chief Inspector of Prisons criticised the "extremely high" amount of force used to control inmates. The report also stated that an unusually high number of prisoners had reported being intimidated or victimised by staff.
Jenny Louis, when appointed governor in February 2021, was Britain’s first female black prison governor.
The prison today
Car park and main entrance
Belmarsh is a Category A Prison holding inmates from all over England and Wales. It also houses other categories of prisoners from primarily the Central Criminal Court (Old Bailey) and Magistrates' Courts in South East London, as well as Crown and Magistrates' Courts in South West Essex. Accommodation at the prison is a mixture of approximately 60% multi-occupancy cells and 40% single cells, distributed mainly across four residential units.
Inmates at Belmarsh have access to education, workshops and two gyms. The gym staff have a partnership with Charlton Athletic F.C. to deliver FA accredited coaching courses for prisoners.
A listener scheme for prisoners at risk from suicide or self-harm is in operation, as well as a support group providing advice on immigration law for foreign national prisoners.
Simon Levy, murdered two women, raped another and committed various other sex offences.
Kay-O, (Kamar Henry-Richards). Participated in the gangland murder of 25-year-old Kacey Boothe in August 2022 and convicted with additional firearms and conspiracy charges.
Sudesh Amman - convicted in 2018 of terrorist offences and imprisoned for three years and four months, before going on to perpetrate the 2020 Streatham stabbing, leading to his death following his release from prison.
Julian Assange - accused by the United States of espionage.
Ronnie Biggs - one of the 11 men convicted of planning and carrying out the Great Train Robbery of 1963. Later released on compassionate grounds in 2009 due to declining health.
Usman Khan - previously convicted of terrorist offences in 2012, before eventually carrying out the 2019 London Bridge stabbings, which resulted in his death.
Axel Rudakubana - convicted of possessing terrorist material and ricin; murdered 3 children and attempted to murder 10 others in the 2024 Southport stabbings. He was later moved to Broadmoor Hospital in 2026, after being declared “medically unfit” for a prison environment.
↑Field, Ronnie; Knight, Martin (2024). Nefarious: The Gripping True Story of a Life in Crime with Notorious London Gangsters including Joey Pyle, the Krays and Freddie Foreman. HarperCollins. p.211.