Saint Patrick's Cathedral in Dublin, Ireland, founded in 1191, is the National Cathedral of the Church of Ireland. With its 43-metre spire, St. Patrick's is the tallest church in Ireland and the largest. Christ Church Cathedral, also a Church of Ireland cathedral in Dublin, is designated as the local Cathedral of the diocese of Dublin and Glendalough.

The organ of St Patrick's Cathedral is one of the largest in Ireland with over 4,000 pipes. Parts of it date from a Renatus Harris instrument of 1695. The organ was rebuilt in the 1890s by Henry Willis and Son, in consultation with Sir George Martin. It was restored in 1963 by J. W. Walker and Sons Ltd.