List of British parliamentarians who died in the First World War

The United Kingdom of Great Britain and Ireland declared war on the German Empire on 4 August 1914 following the invasion of Belgium by Germany, and thus participated for four years in the First World War, on the side of the Allies and against the Central Powers. Some 750,000 British men were killed in war during this conflict.

At the start of the war, the prime minister of the United Kingdom was the Liberal H. H. Asquith, who was reappointed following the December 1910 general election. He led a Liberal minority government, with the support without participation of Irish nationalist MPs from the Irish Parliamentary Party. Challenged for his management of the war, Asquith was forced into May 1915 to form a government of national unity including the Conservative Party and the Labour Party. The prime minister was forced by the Conservatives to resign in December 1916, and David Lloyd George succeeded him at the head of the coalition.

A total of 264 members of the House of Commons enlisted in the armed forces during the First World War. 23 members of the House of Commons were killed in the war (or died as a result of their participation), as were twenty members of the House of Lords and three former members of the Commons. A memorial commemorates these forty-three men, as well as the staff of the two Chambers and the soldiers who died at the front who are sons of parliamentarians, in Westminster Hall, within the grounds of the Palace of Westminster where Parliament sits.

List These forty-three parliamentarians or former parliamentarians who died at the front or as a result of the war are, in chronological order. +#NameParliamentPartyRegimentBirthDeathNotes1Arthur O'NeillMP for Mid Antrim since January 1910Irish Unionist AllianceCaptain, 2d Life Guards Regiment (Cavalry)19 September 18766 November 1914, at the age of 38. Killed in action at Klein Zillebeke, Belgium.2Henry Parnell, 5th Baron CongletonHereditary peer in the House of Lords since 1911UncertainLieutenant, 2nd Battalion, Grenadier Guards6 September 189010 November 1914, at the age of 24. Killed in action at Klein Zillebeke, Belgium.3Frederick Roberts, 1st Earl RobertsHereditary peer in the House of Lords since 1892 (knighted)UncertainBritish Army field marshal30 September 183214 November 1914, at the age of 82. Died of pneumonia while visiting Indian troops on the front at Saint-Omer, France.Commander-in-Chief of the Forces from 1901 to 1904. Recipient of the Victoria Cross for his actions during the Indian Rebellion of 1857 in 1857.4Wyndham Knatchbull-Hugessen, 3rd Baron BrabourneHereditary peer in the House of Lords since 1909Liberal2nd Lieutenant, 1st Battalion Grenadier Guards21 September 188511 March 1915, at the age of 29. Killed in action at the Battle of Neuve-Chapelle.5Will GladstoneMP for Kilmarnock Burghs since September 1911LiberalLieutenant, Royal Welch Fusiliers14 July 188513 April 1915, at the age of 29. Killed in action near Laventie, France.Grandson of former prime minister William Ewart Gladstone.6John EsmondeMP for North Tipperary since December 1910Irish Parliamentary PartyCaptain, Royal Army Medical Corps21 January 186217 April 1915, at the age of 53. Died of pneumonia and exhaustion.7Arthur French, 5th Baron de FreyneHereditary peer in the House of Lords since September 1913UncertainCaptain, 3rd Battalion, South Wales Borderers3 July 18799 May 1915, at the age of 35. Killed at the Battle of Aubers.8Harold CawleyMP for Heywood since January 1910LiberalCaptain, 6th Battalion, Manchester Regiment12 June 187823 September 1915, at the age of 37. Killed in action at the Battle of the Dardanelles.9Thomas Agar-RobartesMP for St Austell since February 1908LiberalCaptain, 1st Battalion, Coldstream Guards22 May 188030 September 1915, at the age of 35. Killed by a sniper at the Battle of Loos while assisting a wounded comrade.10Lord Ninian Crichton-StuartMP for Cardiff since December 1910ConservativeLieutenant-Colonel, 6th Battalion, Welch Regiment15 May 18832 October 1915, at the age of 32. Killed in action at the Battle of Loos.11Charles MillsMP for Uxbridge since January 1910Conservative2nd Lieutenant, 2nd Battalion, Scots Guards13 March 18876 October 1915, at the age of 28. Killed in action at Hulluch, France.Baby of the House from January to December 1910.12William WalrondMP for Tiverton since February 1906ConservativeLieutenant, Railway Supply Detachment, Royal Army Service Corps22 May 18762 November 1915, at the age of 39. Repatriated after being wounded in action in France, and dying of his wounds.13Thomas Pakenham, 5th Earl of LongfordHereditary peer in the House of Lords since 1887ConservativeBrigadier General, 2nd 2nd South Midland Mounted Brigade19 October 186421 August 1915, at the age of 50. Killed in action at the Battle of Sari Bair during the Gallipoli campaign.14Lionel Petre, 16th Baron PetreHereditary peer in the House of Lords since December 1908UncertainCaptain, 4th Pioneer Battalion, Coldstream GuardsNovember 3, 189030 September 1915, at the age of 24. Died of his wounds at the Battle of Loos.15Hereditary peer in the House of Lords since July 1915UncertainCaptain, Lincolnshire Yeomanry (Cavalry)1 May 18915 November 1915, at the age of 24. Wounded aboard the freighter SS Mercian torpedoed by a German submarine, and died at Oran in Algeria two days later.16George Venables-Vernon, 8th Baron VernonHereditary peer in the House of Lords since September 1909LiberalCaptain, Derbyshire Yeomanry28 September 188810 November 1915, at the age of 27. Died of dysentery, contracted while participating in the Gallipoli campaign.17James Ogilvie-Grant, 11th Earl of SeafieldHereditary peer in the House of Lords since 1897UncertainCaptain, 3rd Battalion, Cameron Highlanders18 April 187612 November 1915, at the age of 39. Died of wounds received in Flanders.Scottish nobleman, 30th Chief of Clan Grant.18Gilbert Sackville, 8th Earl De La WarrHereditary peer in the House of Lords since 1896UncertainLieutenant, Royal Naval Volunteer Service22 March 186916 December 1915, at the age of 46. Died in Messina, Italy, of rheumatic fever and dysentery contracted while serving in the Navy.19Michael Hicks Beach, Viscount QueningtonMP for Tewkesbury since February 1906ConservativeCaptain, Royal Gloucestershire Hussars Yeomanry19 January 187723 April 1916, at the age of 39. Died of wounds received at Qatia in the Egyptian Sinai.20Herbert Kitchener, 1st Earl KitchenerHereditary Peer in the House of Lords since 1898 (knighted)UnaffiliatedBritish Army field marshal24 June 18505 June 1916, at the age of 65. Died on board HMS Hampshire, sunk by a German mine.Secretary of State for War since 191421Duncan CampbellMP for North Ayrshire since December 1911UnionistLieutenant-Colonel, Duke of Wellington's Regiment28 April 18764 September 1916, at the age of 40. Seriously wounded in the left arm at the First Battle of Ypres in November 1914, he returned to the front a year later. Wounded by a mine on the western front, he was repatriated once again and died of his injuries.Born in Ontario, Canada; decorated with the Distinguished Service Order22Tom KettleMP for East Tyrone from July 1906 to December 1910Irish Parliamentary PartyLieutenant, Royal Dublin Fusiliers9 February 18809 September 1916, at the age of 36. Killed in action at the Battle of the Somme.Also economist, lawyer, journalist and poet23Guy BaringMP for Winchester since February 1906ConservativeLieutenant Colonel, 1st Battalion, Coldstream Guards26 February 187315 September 1916, at the age of 43. Killed in action at the Battle of the Somme.24Charles Duncombe, 2nd Earl of FevershamMP for Thirsk and Malton from February 1906 to February 1915, then hereditary peer in the House of LordsConservativeLieutenant-Colonel, 21st Battalion of the Royal Corps of the King's Rifles8 May 187915 September 1916, at the age of 37. Killed in action at the Battle of Flers-Courcelette.25Gerald ArbuthnotMP for Burnley from January to December 1910Conservative2nd Lieutenant, Grenadier Guards19 December 187225 September 1916, at the age of 43. Killed in action at the Battle of the Somme.26John Rolls, 2nd Baron LlangattockHereditary peer in the House of Lords since 1912UncertainMajor, 1st Monmouthshire Battery, Royal Field Artillery25 April 187031 October 1916, at the age of 46. Died of his wounds at the Battle of the Somme.Older brother of Charles Rolls, the co-founder of Rolls-Royce.27Auberon Herbert, 9th Baron LucasHereditary peer in the House of Lords since 1905LiberalCaptain, Royal Flying Corps25 May 18763 November 1916, at the age of 40. Wounded by a German fighter plane over German lines, aboard his plane, and died of his wounds.Parliamentary Under-Secretary of State for War from 1908 to 1911, and for the Colonies in 1911.28Henry Barnes, 2nd Baron GorellHereditary peer in the House of Lords since 1913UncertainMajor, 19th London Battery, Royal Field Artillery21 January 188216 January 1917, at the age of 34. Killed in action at Ypres, Belgium.29Henry Howard, 19th Earl of SuffolkHereditary peer in the House of Lords since 1898LiberalMajor, Wiltshire Battery, 3rd Wessex Brigade, Royal Field Artillery13 September 187721 April 1917, at the age of 39. Killed in action at the Battle of Istabulat during the Mesopotamia campaign.30Valentine FlemingMP for Henley since January 1910ConservativeMajor, C Squadron, Oxfordshire Hussars17 February 188220 May 1917, at the age of 35. Killed by German bombardment near Épehy, France.Posthumously awarded the Distinguished Service Order. Father of writers Peter and Ian Fleming.31Shelley Scarlett, 5th Baron AbingerHereditary peer in the House of Lords since 1903UncertainCommander, Royal Naval Volunteer Reserve1 April 187223 May 1917, at the age of 45. Died in London in unspecified circumstances, but listed by Parliament as a casualty of war.Adoptive grandson of Mary and Percy Bysshe Shelley.32Willie RedmondMP for Wexford from 1883 to 1885, for Fermanagh North from 1885 to 1892 and for Clare East from 1892Irish Parliamentary PartyMajor, 6th Battalion, Royal Irish Regiment13 April 18617 June 1917, at the age of 56. Died of a wound sustained during the Battle of Messines.Prominent personality of the Irish nationalist movement.33Francis McLarenMP for Spalding since January 1910Liberal2nd Lieutenant, Royal Flying Corps16 June 188630 August 1917, at the age of 31. Died in a flight accident during training.34Neil PrimroseMP for Wisbech since January 1910LiberalCaptain, Royal Buckinghamshire Yeomanry14 December 188218 November 1917, at the age of 34. Died of wounds sustained in the Third Battle of Gaza.Deputy Minister for Foreign Affairs (February to May 1915). Parliamentary Secretary to the Treasury (December 1916 to March 1917).