Blanchardstown (Irish: Baile Bhlainséir) is a large outer suburb of Dublin in County Fingal, Ireland, which has developed since the 1960s from the historic small village here. It is located 10 km north-west of the Dublin city centre.
It is within the historical barony of Castleknock in the traditional County Dublin, as well as the Dublin 15 postal area and the Dublin West electoral constituency.
Blanchardstown is the largest urban area in Fingal. One of Ireland’s largest shopping and leisure centres, the Blanchardstown Centre, is located in the area.