HM Prison Pentridge was an Australian prison built in 1850 in Coburg, Victoria. The first prisoners arrived in 1851. The prison officially closed on 1 May 1997.
Pentridge was often known by the nickname "The Bluestone College", "Coburg College" or the "College of Knowledge". The grounds were originally landscaped by renowned landscape gardener Hugh Linaker. Since decommissioning, the prison has been partly demolished to make way for a housing development. Large buildings have been built and a 16 floor modern apartment block is being planned.
The site is split in two with the northern prison being developed by Valad Property Group and the other areas by Pentridge Village. The National Trust has expressed strong concerns about the nature of the Heritage Victoria-approved Master Plans which involve peppering the walls with holes and building high-density high-rise between the historic divisions.
The prison was split into many divisions, named using letters of the alphabet.
A – Short and long-term prisoners of good behavior but during the late 1980s till its closure it became a scene of many monthly bashings, stabbings and bludgeonings.
B – Long-term prisoners with behavior problems
C – Vagabonds and short term prisoners, where Ned Kelly was imprisoned (Demolished early 1970s)
D – Remand prisoners
E – A dormitory division housing short term prisoners
F – Remand and short-term
G – Psychiatric problems
H – High security, discipline and protection
J – Young Offenders Group- Later for long-term with record of good behavior
Jika Jika – maximum security risk and for protection, later renamed K Division
In 2014, archaeological work in the former prison grounds led to the discovery of three rare panopticons next to A and B divisions. The first uncovered and excavated was to the north of A division and was built of bluestone in the 1850s. The circular design, with walls coming out from the centre, created wedge shaped 'airing yards' where prisoners would be permitted one hour per day of exercise without coming into contact with each other. The panopticon fell out of use, due to prison overcrowding, in the early 1900s. Two more panopticons next to B division are yet to be fully excavated. The panopticons were based on the design concepts of British philosopher and social reformer Jeremy Bentham.
Jika Jika high security unit
Jika Jika, opened in 1980 at a cost of 7 million Australian dollars, was a 'gaol within a gaol' maximum security section, designed to house Victoria's hardest and longest serving prisoners. It was awarded the 'Excellence in Concrete Award' by the Concrete Institute of Australia before being closed, 8 years later, amidst controversy after the deaths of five prisoners in 1987.
The design of Jika Jika was based on the idea of six separate units at the end of radiating spines. The unit comprised electronic doors, closed-circuit TV and remote locking, designed to keep staff costs to a minimum and security to a maximum. The furnishings were sparse and prisoners exercised in aviary-like escape proof yards.
In 1983 four prisoners escaped from ‘escape proof’ Jika Jika. When two prison officers were disciplined in relation to the Jika Jika escape a week-long strike occurred.
1987 Jika Jika prison fire
Inmates Robert Wright, Jimmy Loughnan, Arthur Gallagher, David McGauley and Ricky Morris – from one side of the unit – and Craig 'Slim' Minogue and three other inmates on the other side sealed off their section doors with a tennis net. Mattresses and other bedding were then stacked against the doors. The windows in the day room were then covered with paper so the prison officers couldn't identify which prisoners caused the ensuing damage.
Prisoners Robert Wright, Jimmy Loughnan, Arthur Gallagher, David McGauley and Ricky Morris died in the fire. Convicted Russell Street bomberCraig Minogue and 3 other inmates survived as they were evacuated when the fire started.
Ned Kelly the day before his execution by hanging. His remains were buried at the former Pentridge Prison site.
The grave site of bushranger Ned Kelly formerly lay within the walls of Pentridge Prison while Ronald Ryan's remains have been returned to his family. Kelly was executed by hanging at the Melbourne Gaol in 1880 and his remains moved to Pentridge Prison in 1929, after his skeleton was disturbed on 12 April 1929 by workmen constructing the present Royal Melbourne Institute of Technology (RMIT) building. Peter Norden, former prison chaplain at Pentridge Prison, has campaigned for the site's restoration.
As of 2011, most of the bodies have been exhumed by archaeologists and have either been re-interred in the original cemetery near D Division, are awaiting identification at the Melbourne morgue or have been returned to their families.
In 2011, Ned Kelly's remains were once again exhumed and returned to his surviving descendants for a proper family burial. The identified remains of Kelly included most of his skull. DNA testing also established another complete skull believed to be Kelly's was not in fact his. 
Ronald Ryan was the last man executed at Pentridge Prison and in Australia. Ryan was hanged in "D" Division at 8.00 on 3 February 1967 after being convicted of the shooting death of a prison officer during a botched escape from the same prison. Later that day, Ryan's body was buried in an unmarked grave within the "D" Division prison facility.
1987 Dennis Mark Quinn –  Recaptured in New Zealand 19 days later.
Usage in media
The front gate showing the "HM Prison Pentridge" sign is featured on the cover of Australian band Airbourne's debut album Runnin' Wild.
Episode 2, Homecomings of the 1976 ABCTV adaption of Frank Hardy's Novel Power Without Glory features John West picking his brother Frank West up from Pentridge Prison after serving 12 years for rape.
The 1988 John Hillcoat and Evan English film "Ghosts... Of The Civil Dead" was largely based on events which occurred in Pentridge Prison's infamous Jika Jika Maximum Security prison during the lead up to the 1987 fire.