Dún Laoghaire, sometimes unofficially spelt using modern Irish orthography as Dún Laoire, is a suburban seaside town in County Dublin, Ireland. It is about twelve kilometres south of Dublin city centre. Dún Laoghaire is the county town of Dún Laoghaire–Rathdown county and formerly a major port of entry from Great Britain. From 1821 to 1921 it was officially called Kingstown.