HM Prison Belfast, also known as Crumlin Road Gaol, is a former prison situated on the Crumlin Road in north Belfast, Northern Ireland. Since 1996 it is the only remaining Victorian era former prison in Northern Ireland. It is colloquially known as the Crum.

The Crumlin Road is a main road in north-west Belfast, Northern Ireland. The road runs from north of Belfast City Centre for about four miles to the outskirts of the city. It also forms part of the longer A52 road which leads out of Belfast to the town of Crumlin. The lower section of the road houses a number of historic buildings, including the city's former law courts and prison, whilst the road encompasses several large housing areas, including Ardoyne, Ballysillan and Ligoniel(from Irish Lag an Aoil, meaning 'hollow of the lime')..