Mountjoy

Mountjoy is a toponym used for several places and institutions, predominantly in Ireland. The most widely recognized uses are Mountjoy Prison, a historic correctional facility in Dublin, and Mountjoy Square, a Georgian-era square in the capital city.

Mountjoy Prison is located in the north inner city of Dublin. It is one of Ireland's oldest operating prisons and has played a prominent role in the country's penal and political history, housing a range of inmates over the centuries and appearing in reporting and literature about Irish criminal justice.

Mountjoy Square is a late 18th-century Georgian square in Dublin. It sits in a residential area connected to the broader Mountjoy district and is noted for its historical architecture and proximity to the city centre. The surrounding area has evolved into a mixed-use district with residential and commercial functions.

Outside Ireland, Mountjoy appears as a place name in other countries, often as a commemorative designation or as a surname-derived toponym. Specific local uses vary and may refer to streets, neighborhoods, or geographic features rather than a single prominent site.