Hugh Redwald Trevor-Roper, Baron Dacre of Glanton, FBA (15 January 1914 - 26 January 2003), was a British historian of early modern Britain and Nazi Germany. He was Regius Professor of Modern History at the University of Oxford. Trevor-Roper was made a life peer in 1979 on the recommendation of Prime Minister Margaret Thatcher, choosing the title Baron Dacre of Glanton. Trevor-Roper was a polemicist and essayist on a wide range of historical topics, but particularly England in the 16th and 17th centuries and Nazi Germany.

On 4 October 1954, Trevor-Roper married Lady Alexandra Henrietta Louisa Howard-Johnston (9 March 1907 - 15 August 1997), eldest daughter of Field Marshal Earl Haig by his wife, the former Hon. Dorothy Maud Vivian. Lady Alexandra was a goddaughter of Queen Alexandra and had previously been married to Rear-Admiral Clarence Dinsmore Howard-Johnston, by whom she had had three children. There were no children by his marriage with her.  Hugh Trevor-Roper was raised to the Peerage on 27 September 1979, and was introduced to the House of Lords as Baron Dacre of Glanton, of Glanton in the County of Northumberland; he was granted this title being a great-great-great-grandson of the Hon. and Reverend Richard Henry Roper, second and youngest son of Anne, (16th) Baroness Dacre, by her second marriage to Henry Roper, 8th Baron Teynham, and was in remainder to the ancient barony of Dacre.  In his last years he had suffered from failing eyesight, which made it difficult for him to read and write. He underwent cataract surgery and obtained a magnifying machine, which allowed him to continue writing. In 2002, at the age of 88, Trevor-Roper submitted a sizable article on Thomas Sutton to the Oxford Dictionary of National Biography in part with notes he had written decades earlier, which editor Brian Harrison praised as "the work of a master". Trevor-Roper suffered several other minor ailments related to his advanced age, but according to his stepson, "bore all his difficulties stoically and without complaint". That year, he was diagnosed with cancer and died on 26 January 2003 in a hospice in Oxford, aged 89.  Trevor-Roper's personal assets were assessed for probate purposes as PS1,638,119 and he was cremated following a memorial service at the Church of St. Thomas the Martyr in Oxford.

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editor Brian Harrison praised as "the work of a master".