Castleknock (Irish: Caisleán Cnucha) is a civil parish and a townland located in the south-western corner of the modern county of Fingal, Ireland.[4 1] The civil parish is part of the ancient barony of Castleknock. It is centred on the suburban village of Castleknock. The townland of Castleknock itself is the location of the eponymous "Cnucha's Castle" – Castleknock Castle. The town with the biggest population in the parish is Blanchardstown. In geology, the parish rests on a substratum of limestone and comprises 2943 statute acres, the whole of which is arable land.
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