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| Location | The Grove, Portland, Dorset |
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| Coordinates | 50°33′01″N 2°25′21″W / 50.5502°N 2.4226°W |
| Security class | Young Offenders Institution |
| Population | 505 (as of June 2018) |
| Opened | 1848 |
| Managed by | HM Prison Services |
| Governor | Pete Lewis [1] |
| Website | Portland at justice.gov.uk |
HM Prison Portland is a male Adult/Young Offenders Institution in the village of The Grove on the Isle of Portland, in Dorset, England. It is operated by His Majesty's Prison Service. The prison was originally opened in 1848 as an adult convict establishment, before becoming a Borstal in 1921, and a YOI in 1988. In 2011 it became an Adult/Young Offenders establishment.
- ^ "Portland Prison and Young Offender Institution". 30 December 2022.