William Smith (16 September 1817 – 22 December 1891) was a Scottish architect. He was a son of John Smith, also an architect, and his mother was Margaret Grant. A partner in the Aberdonian firms J & W Smith (1845–1879), W & J Smith (1879–1887) and W & J Smith and Kelly (1887–1891), and employed as Aberdeen's superintendent of works (1852–1891), he designed a large number of buildings in north east Scotland.