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A–D category: Not yet verified.
Predominant function (2025/26): Category C Trainer/Resettlement
Ministry of Justice performance classification. This describes the stated performance year, not a current A–D category or the categories of every prisoner.
Monthly snapshot: 24 August 2026
Operational capacity is the capacity reported for this prison in the same monthly bulletin.
Official monthly spreadsheet · Ministry of Justice publication
Prison site location
View on the prisons map
Location information checked 13 September 2026.
16 February 2026
Report on an independent review of progress at HMP Onley by HM Chief Inspector of Prisons 6–8 January 2026. Oversight of the use of force had improved, leadership in the offender management unit was better, and attendance at education and work had gone up. However,…
4 August 2025
The relentless targeting of Onley by drones carrying drugs and other contraband was having a hugely destabilising effect on this Midlands category C prison at the time of this inspection. Random drug testing with a positive rate of 34% showed the extent of the challenge…
7 September 2022
HMP Onley is a category C training and resettlement prison in rural Northamptonshire. The work of this jail was being constrained by the staffing situation which was one of the worst I have seen. The nearby convergence of two motorways meant that there were many…
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