William Henry Dunlevy McCormick (24 October 1916, Derry – 28 August 1996) was one of founders of modern Irish architectural movement and one of the most important church architects in Northern Ireland. He was responsible for designing twenty-seven ecclesiastical buildings and numerous commercial and state buildings, including the iconic Met Éireann building in Glasnevin, Dublin. McCormick was an accomplished sailor and member of the Irish Cruising Club, for which he served as flag officer.