Tallaght is the largest settlement, and county town, of South Dublin, Ireland, and the largest satellite town of Dublin. The central village area was the site of a monastic settlement from at least the 8th century, which became one of medieval Ireland's more important monastic centres.
Up to the 1960s, Tallaght was a small village in the traditional County Dublin, linked to several nearby rural areas which were part of the large civil parish of the same name - the local council estimates the population then to be 2,500. Suburban development began in the 1970s and a "town centre" area has been developing since the late 1980s. There is no legal definition of the boundaries of Tallaght, but the electoral divisions known as "Tallaght" followed by the name of a locality have, according to the 2016 census, a population of 76,119, up from 69,454 over five years. There have been calls in recent years for Tallaght to be declared a city.
The village core of the district is located north of, and near to, the River Dodder, and parts of the broader area within South Dublin are close to the borders of Dublin City, Kildare, Dún Laoghaire–Rathdown and County Wicklow.