Montpelier Hill is a 383-metre hill in County Dublin, Ireland. It is topped by the Hell Fire Club, the popular name given to the ruined building. This building – an occasional summer residence built in around 1725 by William Conolly – was originally called Mount Pelier and since its construction the hill has also gone by the same name. The building and hill were respectively known locally as 'The Brass Castle' and 'Bevan's Hill', but the original Irish name of the hill is no longer known although the historian and archaeologist Patrick Healy has suggested that the hill is the place known as Suide Uí Ceallaig or Suidi Celi in the Crede Mihi, the twelfth-century diocesan register book of the Archbishops of Dublin.

County Dublin is a county in Ireland, and holds its capital city, Dublin. It is located on the island's east coast, within the province of Leinster. Until 1994, County Dublin was a single local government area; in that year, the county council was divided into three new administrative counties: Dún Laoghaire–Rathdown, Fingal and South Dublin. The three administrative counties together with Dublin City proper form a NUTS III statistical region of Ireland. County Dublin remains a single administrative unit for the purposes of the courts and Dublin County combined with Dublin City forms the Judicial County of Dublin, including Dublin Circuit Court, the Dublin County Registrar and the Dublin Metropolitan District Court). Dublin also sees law enforcement and fire services administered county-wide.