Hugh William Fortescue, 5th Earl Fortescue, KG, CB, OBE, MC, PC (14 June 1888 – 14 June 1958), styled Viscount Ebrington from 1905 until 1932, of Castle Hill in the parish of Filleigh, of Weare Giffard Hall, both in Devon and of Ebrington Manor in Gloucestershire, was a British peer, military officer, and Conservative politician.
 Hugh Fortescue was the eldest son of Hugh Fortescue, 4th Earl Fortescue (1854–1932) by his wife Emily Ormsby-Gore, a daughter of William Ormsby-Gore, 2nd Baron Harlech.
 He was educated at Eton College from 1901 to 1905, followed by the Royal Military College, Sandhurst.
 In 1907 Fortescue joined the Royal Scots Greys. During the First World War (1914–18) he served in France as a regimental officer for the Scots Greys, followed by the Royal Corps of Signals. He was twice wounded in battle and received the Military Cross in 1917. Following the war he went to India where he served as an instructor at the Cavalry School at Sangor. He then served as aide-de-camp to Henry Rawlinson, 1st Baron Rawlinson, Commander-in-Chief in India. He returned to England in 1922 and joined the Royal Devon Yeomanry. He was promoted lieutenant colonel in command in 1924 and colonel in 1930 and in 1935 he became Colonel Commandant of the Honourable Artillery Company. At the outbreak of the Second World War in 1939, Fortescue joined the General Staff. He was appointed an Officer of the Order of the British Empire for war services in 1942 and Companion of the Order of the Bath in the 1946 Birthday Honours.
 Fortescue succeeded his father in the earldom in 1932 and took up his seat in the House of Lords. He served under Conservative Prime Ministers Stanley Baldwin, Neville Chamberlain and Winston Churchill as a Lord-in-waiting (government whip in the House of Lords) from 1936 to 1945 and under Churchill as Captain of the Honourable Corps of Gentlemen-at-Arms (chief government whip in the House of Lords) in 1945. During the Labour Party's term in power from 1945 to 1951, he was Chief Opposition Whip in the House of Lords. He was again Captain of the Honourable Corps of Gentlemen-at-Arms under Churchill from 1951 to 1955 and under Prime Minister Sir Anthony Eden from 1955 to 1957. He was admitted to the Privy Council in 1952 and received the very great honour of being appointed a Knight Companion of the Order of the Garter in 1951.
 Fortescue served as president of both the British Horse Society and Royal Agricultural Society.
 On 8 February 1917 in London, Fortescue married Margaret Beaumont, a daughter of Wentworth Beaumont, 1st Viscount Allendale by his wife Lady Alexandrina Vane-Tempest, a daughter of George Vane-Tempest, 5th Marquess of Londonderry. By his wife he had four children:
 Fortescue died on his 70th birthday in June 1958, four days after the death of his wife, whose funeral he was too ill to attend. As his only son and heir apparent, Lord Ebrington, had been killed in action at the Battle of El Alamein in 1942, he left no male issue, and was therefore succeeded in the earldom by his younger brother, Denzil Fortescue, 6th Earl Fortescue (1893–1977), who also inherited Ebrington Manor in Gloucestershire, thenceforth the principal seat of the Earls Fortescue.
 Although the title passed to his brother on his death, the 5th Earl left his principal and grandest seat, Castle Hill, Filleigh in North Devon, to his elder surviving daughter, Lady Margaret Fortescue (1923–2013). Castle Hill is now the home of her daughter Eleanor, Countess of Arran (née van Cutsem) and her husband Arthur Gore, 9th Earl of Arran. The 5th Earl Fortescue left his secondary Devon seat, Weare Giffard Hall, to his younger daughter Lady Elizabeth Baxendale (born 1926), who sold it in 1960.