The following is a list of some notable Old Harrovians, former pupils of Harrow School in the United Kingdom.
Naval and military
- Air Commodore Sir Charles Jocelyn Hambro (1897–1963)
- Air Commodore Patrick Huskinson (1897–1966)
- Air Chief Marshal Sir Philip Joubert de la Ferté (1887–1965)[348]
- Admiral of the Fleet Sir James Erskine (1838–1911)
- Admiral of the Fleet Sir George Seymour (1787–1870)
- Rear Admiral George Frederick Ryves (1758–1826)[349]
- Rear Admiral Ion Tower (1889–1940)[350]
- Field Marshal Harold Alexander, 1st Earl Alexander of Tunis (1891–1969), Governor General of Canada (1946–1952)[351]
- Field Marshal John Vereker, 6th Viscount Gort (1886–1946), Chief of Imperial General Staff
- Field Marshal Charles Guthrie, Baron Guthrie of Craigiebank (1938–), Chief of the General Staff (1994–1997) and of the Defence Staff (1997–2001)
- Admiral George Brydges Rodney, 1st Baron Rodney (1718–1792)
- Admiral Sir Augustus Clifford (1788–1877), Gentleman Usher of the Black Rod (1832–1877)[352]
- Admiral Sir Edward Codrington (1770–1851), fought in the Battle of Trafalgar and Battle of Navarino, and MP for Devonport (1832–1839)
- Admiral Sir Henry Codrington (1808–1877)
- Admiral Sir Michael Culme-Seymour, 3rd Baronet (1836–1920)
- Admiral Sir Eliab Harvey MP (1758–1830) of the Battle of Trafalgar
- Admiral William Morier (1790–1864)[353]
- Admiral George Perceval, 6th Earl of Egmont (1794–1874), served on HMS Orion at Trafalgar aged eleven
- Admiral Sir Bartholomew Rowley (1764–1811)
- Vice Admiral Sir Michael Fell (1918–1976), Flag Officer, Aircraft Carriers (1968–1970)
- General Sir Thomas Riddell-Webster (1886–1974), Quartermaster General to the Forces (1942–1946)
- General Sir Walter Congreve VC (1862–1927)
- General Sir Edward Bowater (1787–1861), also Groom in Waiting in Ordinary (1846–1861)[354]
- General Sir Alexander Robert Badcock (1844–1907)
- General Sir George Berkeley (1785–1857)
- General Sir Robert Brownrigg (1758–1833), Quartermaster-General to the Forces (1803–1811) and Governor of Ceylon (1812–1820)
- General Sir Peter de la Billière (1934–)
- General Edward Henry Clive (1837–1916)
- General Sir Moore Disney (1765–1846)[355]
- General Lord Charles FitzRoy MP (1764–1829)[356]
- General Bernard Hale (1725?–1798), Colonel of the 20th Regiment of Foot (1769–1773)[357]
- General Sir Richard Harrison (1837–1931), Inspector-General of Fortifications (1898–1903)[358]
- General Henry Horne, 1st Baron Horne (1861–1929), only British artillery officer to command an army in the First World War
- General Sir Herbert Lawrence (1861–1943)[321]
- General Sir Henry Mackinnon (1852–1929), General Officer Commanding the Western Command (1910–1916)[359]
- General Sir Rodney Moore (1905–1985)
- General Lord Alexander Russell (1821–1907)
- General Francis Seymour, 5th Marquess of Hertford (1812–1884), Lord Chamberlain to Queen Victoria (1874–1879)
- General Sir Horace Smith-Dorrien (1858–1930)
- General Sir George Alexander Weir (1876–1951)
- General Sir Lashmer Whistler (1898–1963)[360]
- Vice-Admiral Sir Peter Berger (1925–2003)
- Vice-Admiral the Hon. Charles Orlando Bridgeman (1791–1860)
- Vice-Admiral of the Red George Eyre (1782–1839)
- Vice-Admiral Richard Saunders Dundas (1802–1861), First Sea Lord (1857–1858; 1859–1861)[361]
- Lieutenant-General Everard Bouverie (1789–1871)
- Lieutenant General James Brudenell, 7th Earl of Cardigan (1797–1868), Leader of the Charge of the Light Brigade at the Battle of Balaclava[315]
- Lieutenant General Sir Chandos Blair (1919–2011)
- Lieutenant General Sir Richard Butler (1870–1935)
- Lieutenant General Sir Alfred Codrington (1854–1945)
- Lieutenant General Sir Sidney Clive (1874–1959)
- Lieutenant General Sir Harry Calvert (1763–1826), 1st Baronet[362]
- Lieutenant General Sir Anthony Denison-Smith (1942–)
- Lieutenant General Sir Edward Locke Elliot (1850–1938)[319]
- Lieutenant General William Gott (1897–1942), Appointed commander of Eighth Army before dying in air crash
- Lieutenant General Sir Charles Kavanagh (1864–1950)[363]
- Lieutenant General Sir Brian Kimmins (1899–1979)
- Lieutenant General Francis Lloyd (1853–1926), General Officer Commanding London District (1913–1918)[364]
- Lieutenant-General Robert Ballard Long (1771–1825), Peninsular War cavalry commander[365]
- Lieutenant General Sir Arthur Lyttelton-Annesley (1837–1926), Commander-in-Chief, Scotland[366]
- Lieutenant-General James Wolfe Murray (1853–1919), Chief of the Imperial General Staff (1914–1915)[367]
- Lieutenant General William Rous (1939–1999), Quartermaster-General to the Forces (1994–1996)
- Lieutenant General Hussey Vivian, 1st Baron Vivian (1775–1842)[368]
- Lieutenant-General William Warre (1784–1853)[369]
- Major-General Hon. Edward Acheson (1844–1921)[370]
- Major-General Sir Allan Adair, 6th Baronet (1897–1988), Colonel of the Grenadier Guards (1961–1974)[371]
- Major-General Sir Jack d'Avigdor-Goldsmid (1912–1987), 3rd Baronet
- Major-General Sir Henry d'Avigdor-Goldsmid (1909–1976), 2nd Baronet
- Major-General John Talbot Coke (1841–1912)
- Major-General Sir George Cooke (1766–1837)
- Major-General Sir Percy Cox (1864–1937)
- Major-General Sir John Davidson (1876–1954), MP for Fareham (1918–1931)
- Major-General Sir James Syme Drew (1883–1955), K.B.E., C.B., D.S.O., M.C., D.L., Colonel of the Queen's Own Cameron Highlanders (1943–1951)[372]
- Major-General James Bucknall Bucknall Estcourt MP (1803–1855), involved in the Webster–Ashburton Treaty[373]
- Major-General Robert Garrett (1794–1869), Commander British Forces in Hong Kong (1854–1857)[374]
- Major-General Francis Hoare (1879–1959), Director Air Services of the South African Air Force (1937)[375]
- Major-General Spencer Edmund Hollond (1874–1950)[376]
- Major-General Sir George Kemball (1858–1941)[377]
- Major-General Herman Landon (1859–1948)[378]
- Major-General Eric Miles (1891–1977), General Officer Commanding the South Eastern Command (1944)
- Major General Gilbert Monckton, 2nd Viscount Monckton of Brenchley (1915–2006)
- Major-General Harold de Riemer Morgan (1888–1964), General Officer Commanding the 45th Infantry Division (1941–1943) and Colonel of the Royal Northumberland Fusiliers (1947–1953)[379]
- Major-General Cosmo Nevill (1907–2002), General Officer Commanding the 2nd Infantry Division (1956–1958)
- Major-General Oliver Nugent (1860–1926)
- Major-General James Rawlins (1823–1905)
- Major-General Michael Riddell-Webster (1960–), Governor of Edinburgh Castle (2015–2019)
- Major-General Frederick Robb (1858–1948)[380]
- Major General Sir Andrew Hamilton Russell (1868–1960), New Zealand commander at Gallipoli
- Major-General Charles Sackville-West, 6th Earl De La Warr (1815–1873)[381]
- Major-General Sir John Swinton of Kimmerghame (1925–2018), Major-General commanding the Household Division (1976–1979) and father of actress Tilda Swinton
- Major General Philip Tower (1917–2006), Commandant of the Royal Military Academy Sandhurst (1968–1972)
- Major General Russell Upcher (1844–1937)
- Air Vice-Marshal Charles Hubert Boulby Blount (1893–1940)
- Brigadier-General Francis Charles Bridgeman (1846–1917)
- Brigadier-General Charles Granville Bruce (1866–1939)[382]
- Brigadier-General Charles Bulkeley Bulkeley-Johnson (1867–1917)[383]
- Brigadier General Eyre Crabbe (1852–1905)
- Brigadier-General Charles Granville Fortescue (1861–1951)[261]
- Brigadier General Hubert Foster (1855–1919), Chief of the Australian General Staff (1916–1917)[384]
- Brigadier-General Cuthbert Hoare (1883–1969)[385]
- Brigadier-General Harvey Kearsley (1880–1956), courtier in the Household of Queen Elizabeth II
- Brigadier General Walter Long (1879–1917)
- Brigadier-General Horace Sewell (1881–1953), British Army officer known for his mixed race ancestry[386]
- Brigadier Cecil Arthur Harrop Chadwick (1901–1970)
- Brigadier Archer Clive (1903–1995)
- Colonel Guy Brownlow (1883–1960)
- Colonel Frederick Burnaby (1842–1885)[387]
- Colonel Sir William Howe De Lancey (1778–1815), who died of wounds from the Battle of Waterloo
- Colonel Richard Meinertzhagen CBE, DSO (1878–1967)
- Colonel Thomas Wildman (1787–1859), High Sheriff of Nottinghamshire (1821–1822)
- Lieutenant-Colonel Lord Ninian Crichton-Stuart (1883–1915)
- Lieutenant-Colonel Henry George Orlando Bridgeman (1882–1972)
- Lieutenant-Colonel Dudley Gordon, 3rd Marquess of Aberdeen and Temair (1883–1972)
- Lieutenant-Colonel Ivan Lyon (1915–1944), commander Operation Jaywick
- Lieutenant-Colonel Sir Fleetwood Edwards (1842–1910), Keeper of the Privy Purse[388]
- Lieutenant-Colonel Robert Sanders, 1st Baron Bayford (1867–1940)
- Lieutenant-Commander John Boyle, 15th Earl of Cork (1945–), commander of HMS Sealion and elected peer to the House of Lords
- Wing Commander Archie Boyd (1918–2014)
- Major Sir Robert Lister Bower (1860–1929), British Army and Colonial Police Officer
- Major Sir Charles James Buchanan (1899–1984), 4th Baronet
- Major Eric Buller MC (1894–1973), British Army officer and cricketer[389]
- Major Johnnie Cradock (1904–1987)
- Major Sir George FitzGerald, 23rd Knight of Kerry (1917–2001) of the Irish Guards
- Major David Gordon, 4th Marquess of Aberdeen and Temair (1908–1974)
- Major Charles Beck Hornby (1883–1949), believed to be the first British soldier to kill a German soldier in the First World War[390]
- Major David Liddell (1917–2008)
- Major Kenneth McLaren (1860–1924), British army soldier who assisted in the growth of the Scouting movement[321]
- Major Hugh Wyld (1880–1961), British Army officer and cricketer
- Major Francis Yeats-Brown (1886–1944), British cavalry officer and author of The Lives of a Bengal Lancer
- Squadron Leader Gordon Cleaver (1910–1994)
- Squadron Leader John Crampton (1921–2010)
- Squadron Leader Lord David Douglas-Hamilton (1912–1944)
- Squadron Leader Christopher Riddle (1914–2009)
- Captain George Whatford (1878–1915), cricketer and British and Indian Army officer
- Second Lieutenant Orlando Clive Bridgeman (1898–1931), World War I flying ace credited with five aerial victories
- Lieutenant George Byron, 9th Baron Byron (1855–1917)
- Robert Gregory (1881–1918), Irish flying ace and first-class cricketer[391]
- Henry Tempest Hicks (1852–1922), British soldier[392]
- John Fortescue (1859–1933), military historian[393]
- Anthony Buxton DSO (1881–1970), soldier and author[394]
- Percy Laurie (1880–1962), Provost-Marshal of the United Kingdom (1940–1943)[395]
- Richard Kidder Meade (1746–1805), an aide-de-camp to General George Washington (later U.S. president)
- Constantine Scaramanga-Ralli (1854–1934), British author on compulsory military training[396]
- Charles Tempest-Hicks (1888–1918), English soldier[391]
Victoria Cross holders
Twenty Old Harrovians have been awarded the Victoria Cross:[397]