Collinstown is a townland in Fingal, County Dublin, roughly 7 km north of Dublin in Ireland. This area is in the civil parish of Santry, within the barony of Coolock. The townland is entirely within the perimeter of Dublin Airport, which grew out of Collinstown Aerodrome, originally a Royal Air Force station. In the Irish War of Independence the aerodrome was converted to become Collinstown Camp, used for internment of Irish republicans.