Frederick Temple Hamilton-Temple-Blackwood, 3rd Marquess of Dufferin and Ava, DSO, PC (Ire) (26 February 1875 – 21 July 1930), styled Lord Frederick Blackwood between 1888 and 1918, was a British soldier and politician. He died in an aircraft crash in 1930 at the age of 55.

Lord Dufferin was born on 26 February 1875 in Ottawa, Ontario, Canada, during his father's term as Governor General of Canada.^[1][2] He was the fourth son of Frederick Hamilton-Temple-Blackwood, 1st Marquess of Dufferin and Ava and Hariot Hamilton-Temple-Blackwood, Marchioness of Dufferin and Ava.^[3] While his father was Viceroy and Governor-General of India in the 1880s, his mother was known for leading an initiative to improve medical care for women in British India.^[4]

Hamilton-Temple-Blackwood joined the 9th Lancers as a second lieutenant on 11 August 1897. He was promoted to lieutenant on 9 October 1899,^[5] 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^[6]), he was awarded the Distinguished Service Order (DSO) in November 1900 for his service during the war.^[7]

Hamilton-Temple-Blackwood retired from the army in 1913 with the rank of captain.^[8]

Lord Dufferin was married on 10 June 1908 to Brenda Woodhouse, only daughter of Major Robert Woodhouse, of Orford House, Bishop's Stortford, Hertfordshire. They had two children:^[8]

• Basil Sheridan Hamilton-Temple-Blackwood, 4th Marquess of Dufferin and Ava (1909–1945), who married Maureen Constance, the second daughter of Hon. Arthur Ernest Guinness (a son of Edward Guinness, 1st Earl of Iveagh).^[8]
• Lady Veronica Brenda Hamilton-Temple-Blackwood (1910–1971), who married firstly Antony Hornby, second son of St John Hornby, of Shelley House, Chelsea and Chantemarle, Dorset, on 17 December 1931 (div. 1940) and has issue by the marriage; secondly Squadron Leader E. H. Maddick of the Royal Air Force in October 1941 (div. 1947); thirdly Captain Thomas Andrew Hussey CBE of the Royal Navy on 15 June 1947 (div. 1956); and fourthly to Peter Rebuck Wolfe in July 1956.^[8]

On 21 July 1930, Lord Dufferin was flying with a party of friends from Berck, a small village in France near Le Touquet, back to England when the aircraft crashed outside Meopham, Kent, killing all those on board. The others in the party were Sir Edward Simons Ward, Bt.; Viscountess Ednam, the wife of Viscount Ednam (heir to the Earl of Dudley) and a daughter of Cromartie Sutherland-Leveson-Gower, 4th Duke of Sutherland; and Mrs Loeffler, a well-known society hostess, along with the pilot, Lt. Col. George Lochart Henderson and the assistant pilot, Mr C. D. Shearing. Lord Dufferin was buried in the family burial ground at Clandeboye, County Down.^[8]

Lord Dufferin's widow married again after his death to Henry Charles Somers Augustus Somerset (1874–1945), the only son of Lord Henry Somerset (himself the brother of Henry Somerset, 9th Duke of Beaufort) on 28 January 1932. Mrs Somerset died on 17 July 1946.^[8]