Dublin Castle is situated in the very heart of historic Dublin and is located on the south side of the river Liffey. It can be reached from Dame street, and is about a minute's walk from the Olympia Theatre. The Dublin Castle website has excellent directions to the Castle gates at http://www.dublincastle.ie/maps.html
There are a number of public car parks nearby. The nearest is that of Jury's Inn Christchurch, which is located in Werburg Street: Tel. 00353 1 454 0000, Fax 00353 1 454 0012
Dublin Bus routes nos. 77, 77A, 56A and 49 from Eden Quay and no. 123 from O'Connell Street stop at Palace Street Gate, see Dublin Bus.