John Smith Murdoch CMG (29 September 1862 – 21 May 1945) was a Scottish architect who practised in Australia from the 1880s until 1930. Employed by the newly formed Commonwealth Public Works Department in 1904, he rose to become chief architect, from 1919 to 1929, and was responsible for designing many government buildings, most notably the Provisional Parliament House in Canberra, the home of the Parliament of Australia from 1927 to 1988.