John Hirram Haycock was an architect and surveyor active, particularly in Shrewsbury, England, in the late-18th and early-19th centuries. He was born in 1759, the second son of William Haycock (born 1725, died 1802), a craftsman and builder of Shrewsbury, England. It was to him that Haycock was first apprenticed in 1774.
In 1780 Haycock was made a freeman of the Shrewsbury Carpenters' and Bricklayer's Company. In 1796, he became a burgess of that city and in 1824 was appointed its Country Surveyor.
John Hiram Haycock died on 6 January 1830 at Shrewsbury. He was buried at St. Chad's Church.
Colvin, Howard, A Biographical Dictionary of British Architects 1660-1840, Third Edition (Yale and New Haven: Yale University Press: 1995), pp. 481-482.