Balrothery West (Irish: Baile an Ridire Thiar[1]) is one of the baronies of Ireland. Originally part of the Lordship of Meath, it was then constituted as part of the old county of Dublin. Today, it lies in the modern county of Fingal.[1]
The barony of Balrothery was created by Hugh de Lacy, Lord of Meath as his own feudal barony, held directly from himself in capite. His vassals were commonly called "De Lacy's Barons".[2] Balrothery, thus once a feudal title of nobility, was later split into eastern and western divisions.