William Henry Dunlevy McCormick (24 October 1916, Derry – 28 August 1996) was one of the founders of the modern Irish architectural movement and one of the most important church architects in Ulster.
On his return to Northern Ireland he began working for the Derry Corporation and later for Ballymena Urban District Council.
In 1947, whilst convalescing, together with Frank Corr, McCormick successfully won a competition to design a new church for Ennistymon in County Clare.
McCormick continued to design churches until his retirement in 1982, after which he completed a number of private commissions, including the house near Greencastle of his close friend and Derry politician John Hume.
In 1999 McCormick's St Aengus' Church, Burt, County Donegal was voted Ireland's "Building of the 20th century" in a readers' poll organised by the Royal Institute of the Architects of Ireland and the Sunday Tribune,[4] which featured windows from a stained glass artist he commissioned for 11 of his buildings, Helen Moloney.