Castleknock is a railway station that serves the suburban centres of Castleknock and Blanchardstown in Fingal, Ireland.

It lies on the Dublin to Longford commuter route and is served by Western Commuter services from Pearse Station to Maynooth and Docklands to M3 Parkway.

The station is parallel to the Royal Canal near the 12th lock.

It originally featured a portacabin booking office; however, a permanent station building was constructed (and the platforms lengthened) as part of the upgrade of the Western Commuter service in 2000.

The ticket office is no longer staffed.