| Surname | Forename | Rank | Unit | Born | Resided |
| HART | William Taylor | Lance Corporal | Royal Dublin Fusiliers | Born Dublin | |
| HARTE | Michael Joseph | Captain | Army Service Corps, attached 2nd/6th Battalion, Sherwood Foresters (Nottinghamshire and Derby Regiment) | | |
| HARTFORD | John | Private | Royal Dublin Fusiliers | Born Dublin | |
| HARTNETT | Michael Charles | Lieutenant | Royal Flying Corps and Royal Munster Fusiliers | Born at Kenmare, Co. Kerry | |
| HARTWELL | Barry | Captain | 2nd Battalion, 8th Gurkha Rifles | | |
| HARVEY | Michael | Fireman | S.S. "Leinster" (Dublin) | | |
| HARVEY | Edward | Corporal | Royal Dublin Fusiliers | Born Dublin | |
| HARVEY | George | Private | Royal Dublin Fusiliers | Born Dublin | |
| HARVEY | Peter | Private | Household Cavalry and Cavalry of the Line (including Yeomanry) | Born Dublin | Resided Dublin |
| HARVEY | James | Private | Royal Inniskilling Fusiliers | Born St. Munchins, Limerick | Resided Dublin |
| HARVIE | Patrick Joseph | Lieutenant | 9th Battalion, Northumberland Fusiliers | | |
| HASKINS | S | Private | Australian Imperial Force | | |
| HASKINS | Charles | Rifleman | Royal Irish Rifles | Born Dublin | |
| HASKINS | Thomas | Corporal | Princess Victoria's (Royal Irish Fusiliers) | Born Dun Laoghaire, Co. Dublin | Resided Dun Laoghaire |
| HASKINS | Thomas | Private | Royal Dublin Fusiliers | Born Dublin | |
| HASKINS | T | Corporal | Royal Dublin Fusiliers | | |
| HASSETT | Michael | Private | East Surrey Regiment | Born Dublin | Resided Coventry, Warwickshire |
| HASTE | Robert | Sergeant | Lancashire Fusiliers | Born Dublin | |
| HATTE | Edward Stokes | Second Lieutenant | 7th Battalion, Royal Irish Rifles | | |
| HATTON | William Patrick | Private | Buffs (East Kent Regiment) | Born Colchester, Essex | Resided Dublin |
| HAVERTY | John | Private | Welsh Regiment | Born Pembroke, Co. Dublin | Resided Merrion, Co. Dublin |
| HAVERTY | Martin | Private | Royal Munster Fusiliers | Born Dun Laoghaire, Co. Dublin | Resided Merrion, Co. Dublin |
| HAWKES | George | Corporal | Machine Gun Corps | Born St. James, Dublin | Resided Dublin |
| HAWKINS | Edwin | Mate | S.S. "Storm" (Guernsey) | Born at Port St. Mary, Isle of Man | |
| HAWKINS | Henry | Stoker 1st Class | H.M.S. "Vanguard" | | |
| HAWKINS | John | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |
| HAWKINS | Patrick | Private | Royal Dublin Fusiliers | Born Dublin | |
| HAWKINS | George | Private | Duke of Edinburgh's (Wiltshire Regiment) | Born Semington, Wilts | Resided Dublin |
| HAWTHORNE | Charles | Private | Prince of Wales's Volunteers (South Lancashire Regiment) | Born Dublin | |
| HAYBYRNE | Francis | Sergeant | Rifle Brigade (The Prince Consort's Own) | Born Dublin | Resided Warrington, Lancs |
| HAYDEN | James | Fireman | S.S. "Pola" (London) | Born in Dublin | |
| HAYDEN | T | Chief Shipwright 2nd Class | H.M.S. Bryony | | |
| HAYDEN | Christopher | Corporal | Princess Victoria's (Royal Irish Fusiliers) | Born Dublin | |
| HAYDEN | Denis | Private | Royal Inniskilling Fusiliers | Born Dublin | |
| HAYDEN | Edward | Private | Royal Dublin Fusiliers | Born Dublin | |
| HAYDEN | Hugh | Private | Royal Inniskilling Fusiliers | Born Rathfarnham, Co. Dublin | |
| HAYDEN | Michael | Private | Princess Victoria's (Royal Irish Fusiliers) | Born Dublin | |
| HAYDEN | Stephen Joseph | Bombardier | Royal Horse Artillery and Royal Field Artillery | Birthplace unknown | Resided Dublin |
| HAYES | Charles Bianconi | Captain | Hampshire Regiment | | |
| HAYES | John Carolin | Lieutenant | 2nd Battalion, Coldstream Guards | | |
| HAYES | Christopher | Lance Corporal | Royal Dublin Fusiliers | Born Dublin | |
| HAYES | Daniel | Lance Corporal | Royal Dublin Fusiliers | Born Dublin | |
| HAYES | David | Private | Royal Dublin Fusiliers | Born Dublin | |
| HAYES | Henry | Private | Royal Dublin Fusiliers | Born Dublin | |
| HAYES | John | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| HAYES | William | Rifleman | Royal Irish Rifles | Born Dublin | |
| HAYES | William | Private | Royal Fusiliers (City Of London Regiment) | Born St. Andrew's, Dublin | Resided Dublin |
| HAYES | Edward | Private | Prince of Wales's Volunteers (South Lancashire Regiment) | Born St. Helens, Lancs | Resided Dublin |
| HEADE | Thomas | Private | Lancashire Fusiliers | Born Dublin | |
| HEALY | John Frederick | Lieutenant | 3rd Battalion, attached 9th Battalion, Royal Irish Rifles | Born at Dublin | |