William Hiorne was an architect and master builder active, especially in Warwick, England, in the mid-18th century. Hiorne was born in 1712 in Great Tew in Oxfordshire, the son of John Hiorne and elder brother to the architect David Hiorne (born 1715, died 1758).
Hiorne is perhaps best noted for the number of country houses and churches he designed and built across the Midlands and is known to have been, together with his brother, responsible for several garden buildings.
He is particularly associated with the Palladian style and also for hinting at the rococo in some of his interiors.
Hiorne died on 22 April 1776.
Colvin, Howard, A Biographical Dictionary of British Architects 1600-1840, 3rd edition (New Haven and London: Yale University Press, 1995), pp. 496-498.