Mountjoy Prison
 View of the prison from North Circular Road | |
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| Location |
|
|---|---|
| Status | Operational |
| Security class | Medium security |
| Capacity | 831 |
| Population | 1120 (2026) |
| Opened | 1850 |
| Managed by | Irish Prison Service |
| Governor | Ray Murtagh |
Mountjoy Prison (Irish: Príosún Mhuinseo), founded as Mountjoy Gaol and nicknamed The Joy, is a medium security men's prison located in Phibsborough in the centre of Dublin, Ireland. The current prison Governor is Ray Murtagh.