William Hague Jr. (1840–1899) was a well-known Irish Roman Catholic ecclesiastical architect active throughout mid- to late-nineteenth-century Ireland, particularly in Ulster. He is known as a protégé of A.W.N. Pugin. His office was located at 50 Dawson Street, Dublin.
He was born in County Cavan, the son of William Hague, a builder, and there designed several Roman Catholic churches, many in the French Gothic style. Hague died the year Omagh’s Sacred Heart was dedicated and consequently it was “a culmination of his amazing catalogue of completed ecclesiastical designs and his continuous championship of the Gothic Revival style,” according to Richard Oram in Expressions of Faith-Ulster’s Church Heritage. Following his death, his partner T. F. McNamara took over most of his commissions under the firm name of Hague & McNamara.