Lieutenant Donald Cameron Deford Macmaster was a Canadian officer of the British Army who died during the First World War.
He was born in 1894, in Montreal, Quebec, the only son of politician and lawyer Sir Donald and the American Ella Virigina Macmaster (née DeFord). His father emigrated to Britain in 1905, to "start afresh", with the intention of concentrating on cases relating to the Privy Council. He went onto be elected to the House of Commons. The younger Donald attended Rugby School from 1908 to 1911. Following a year of study at Tours, France, Macmaster took law at Trinity College, Cambridge, where he was an undergraduate at the time of volunteering for the British Army.
Macmaster was gazetted as a temporary second lieutenant in late August 1914, and arrived on the Western Front in July 1915, with the 6th (Service) Battalion, The Queen's Own Cameron Highlanders. He died on 25 September, on the opening day of the Battle of Loos, when he was killed close to the front of the German first-line trenches.
He is buried in Dud Corner Cemetery, Loos.
- The Times (42971), Col D, p. 12: "Death Of Sir D. Macmaster". 4 March 1922.
- Rugby School (1916), Memorials Of Rugbeians Who Fell In The Great War, Vol 2.
- The London Gazette (28879). 25 August 1914. Retrieved 25 October 2012.
- Macmaster, Donald Cameron Deford, cwgc.org. Retrieved 25 October 2012.