Frederick Hamilton-Temple-Blackwood, 3rd Marquess of Dufferin and Ava

Frederick Temple Hamilton-Temple-Blackwood, 3rd Marquess of Dufferin and Ava DSO, PC (26 February 1875 – 21 July 1930), styled Lord Frederick Blackwood between 1888 and 1918, was a British soldier and politician.

Lord Dufferin was the fourth son of Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava. He was born in Ottawa, Ontario, Canada, during his father's term as Governor General of Canada.

Hamilton-Temple-Blackwood joined the 9th Lancers as a second lieutenant on 11 August 1897. He was promoted to lieutenant on 9 October 1899, and served with his regiment during the Second Boer War from 1899 to 1901, where he was present at the engagements at Belmont, Enslin, Modder River, Magersfonstein, the relief of Kimberley, and the advance to Bloemfontein and Pretoria. He was also present at the subsequent fighting in the Transvaal, Orange River Colony and Cape Colony, where he was badly wounded on Christmas Eve 1900. Twice mentioned in despatches (including 31 March 1900), he was awarded the Distinguished Service Order (DSO) in November 1900 for his service during the war.

He retired from the Army in 1913 with the rank of captain.

After leaving the Army he was appointed military secretary to the Governor General of Australia, Sir Ronald Munro-Ferguson (later Viscount Novar), who was his brother-in-law. Following the outbreak of the First World War he rejoined his old regiment the 9th Lancers and was seriously wounded when serving on the Western Front in October 1914 and was subsequently transferred to the Grenadier Guards. He was again seriously wounded in the autumn of 1915 having returned to duty for only three days. He served as a staff captain in the Guards Division in 1916 and was seconded to the Machine Gun Corps as an instructor in 1918. After the war he was president of the Ulster Ex-Servicemen's Association.

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