Tibradden Mountain is a mountain in County Dublin in the Republic of Ireland. Other former names for the mountain include "Garrycastle" and "Kilmainham Begg". It is 467 metres high and is the 561st-highest mountain in Ireland. It forms part of the group of hills in the Dublin Mountains which comprises Two Rock, Three Rock, Kilmashogue and Tibradden Mountains. The views from the summit encompass Dublin to the north, Two Rock to the east and the Wicklow Mountains to the south and west.

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.