William Day was an Irish architect and builder active in the southeast of Ireland in the late eighteenth and early nineteenth century. He was related to architects John Day and Martin Day, both of County Wexford. His only known design was for the replacement St. Mary's Church of Ireland Church, Kilmore, County Wexford (1798–1802), although he was not responsible for the tower (1889), annexe (1898), and later vestry (1935).''Churches of the Diocese of Ferns'' (Dublin: Booklink, 2004), 88

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Irish ecclesiastical architects Architects from County Wexford Year of death missing Year of birth missing 18th-century Irish architects 19th-century Irish architects {{Ireland-architect-stub