Loughlinstown (Irish: Baile Uí Lachnáin, meaning "The Town of O'Loughnin") is a south Dublin suburb. Located in Dún Laoghaire–Rathdown county, it lies on the N11 National Primary Route.
Loughlinstown is the location of St. Columcille's Hospital, which serves both south Dublin and north Wicklow. The European Foundation for the Improvement of Living and Working Conditions, an EU body, is located in Loughlinstown House.
Loughlinstown (also Loughnanstown EME) is a derivation of the townland's ancient name, Lochan, which is said to have originally encircled a small lake at the meeting of the Carrickmines River and Bride's Glenn Stream.
Loughlinstown was inhabited from at least the Neolithic period when the megalithic portal tomb at Cromlech Fields was constructed circa 2,500 B.C. Following Henry II's conquest of Ireland the lands around Loughlinstown were granted to the Anglo-Norman Talbot Family. By 1541 they had been granted to Goodman Family, who held them as "warden of the marches" protecting the southern border of the Pale from raids and incursions of the Wicklow Septs.
An 1654 survey describes the area as containing 458 acres, of which 300 acres were the property of James Goodman, who acted as Provost Marshal of the Irish Confederate Army during the Irish Rebellion of 1641. The remaining 128 acres were the property of the Dean of Christchurch.
Loughlinstown was granted to Sir William Domville, Attorney General for Ireland, in the reign of Charles II and James II. The Domville family held the lands for three centuries until 1962 when they were sold to Sir John Galvin.