| Surname | Forename | Rank | Unit | Born | Resided |
| NOONAN | Matthew | Private | Irish Guards | Born Dublin | |
| NOONE | Christopher | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| NOONE | William | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| NOONEY | Philip | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Mohill, Co. Leitrim | Resided Dublin |
| NORMAN | John | Corporal | Royal Dublin Fusiliers | Born Glasnevin, Dublin | Resided Dublin |
| NORMAN | William George | Private | Machine Gun Corps | Born Dublin | Resided Whitstable, Kent |
| NORMINGTON | Joseph | Private | Royal Dublin Fusiliers | Born Dublin | |
| NORRIS | Reginald Alexander | Private | Suffolk Regiment | Born Newbridge, Dublin | |
| NORRIS | Thomas Gerald | Private | Household Cavalry and Cavalry of the Line (including Yeomanry) | Born Clontard, Dublin | |
| NORTH | Harry Lonsdale | Lieutenant | 3rd Battalion, attached 2nd Battalion, Royal Irish Regiment | | |
| NORTON | John Christopher | Lance Corporal | Household Cavalry and Cavalry of the Line (including Yeomanry) | Born Lask, Dublin | Resided Lask |
| NOTLCY | Henry | Private | Princess Victoria's (Royal Irish Fusiliers) | Born BallymoreEustace, Co. Kildare | Resided Dublin |
| NOWLAN | William | Private | Irish Guards | Born Dublin | |
| NOWLAN | William Thomas | Lance Corporal | Royal Irish Rifles | Born Dublin | |
| NUGENT | James | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| NUGENT | Matthew | Private | Royal Dublin Fusiliers | Born Dublin | |
| NUGENT | Michael | Private | Royal Irish Regiment | Born Chapelizod, Co. Dublin | |
| NULTY | Henry | Lance Corporal | Royal Dublin Fusiliers | Born Dublin | Resided Dublin |
| NULTY | Thomas | Private | Royal Dublin Fusiliers | Born Balbriggan, Co. Dublin | |
| NYHAN | T | Able Seaman | S.S. "Hazelwood" (Middlesbrough) | Born in Dublin | |
| O'BEIRNE | Ernest Louis | Able Seaman | Hood Battalion, Royal Navy Division | | |
| O'BEIRNE | John | Private | Royal Dublin Fusiliers | Born Dublin | |
| O'BEIRNE | Michael | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | Resided Dublin |
| O'BEIRNE | Patrick | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| O'BEIRNE | Thomas | Sergeant | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |
| O'BRIAN | Luke | Private | Highland Light Infantry | Born Dublin | |
| O'BRIEN | Joseph | Leading Stoker | H.M.S. "Dartmouth" | | |
| O'BRIEN | Patrick | Able Seaman | H.M.S. "Anchusa" | | |
| O'BRIEN | Robert | Petty Officer Stoker | H.M.S. "Drake" | | |
| O'BRIEN | Andrew | Private | King's (Liverpool Regiment) | Born Dublin | Resided Londonderry, Ireland |
| O'BRIEN | Augustine | Private | King's Own (Yorkshire Light Infantry) | Born Dublin, Ireland | |
| O'BRIEN | Brenden | Private | Devonshire Regiment | Born Dublin | Resided Dublin |
| O'BRIEN | Charles | Private | Royal Dublin Fusiliers | Born Dublin | |
| O'BRIEN | Christopher | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Crumlin, Co. Dublin | |
| O'BRIEN | Dan | Rifleman | Royal Irish Rifles | Born Dublin | |
| O'BRIEN | Daniel | Private | Labour Corps | Born Malahide, Dublin | Resided Bagenalstown, Co. Carlow |
| O'BRIEN | Denis | Private | Royal Inniskilling Fusiliers | Born Dublin | |
| O'BRIEN | Edward | Private | Royal Irish Regiment | Born St. Thomas, Dublin | |
| O'BRIEN | Edward | Private | Durham Light Infantry | Born Dublin | Resided Dublin |
| O'BRIEN | Edward | Corporal | Royal Dublin Fusiliers | Born Dublin | |
| O'BRIEN | George | Corporal | Machine Gun Corps | Born Howth, Dublin | Resided Howth |
| O'BRIEN | George | Private | Royal Dublin Fusiliers | Born Rathmines, Dublin | |
| O'BRIEN | George | Rifleman | Royal Irish Rifles | Born Dublin | |
| O'BRIEN | Henry George | Private | Royal Dublin Fusiliers | Born Monkstown, Co. Dublin | |
| O'BRIEN | James | Private | Royal Dublin Fusiliers | Born Dublin | |
| O'BRIEN | James | Gunner | Royal Horse Artillery and Royal Field Artillery | Born Dublin | |
| O'BRIEN | James | Rifleman | Royal Irish Rifles | Born Dublin | |
| O'BRIEN | John | Private | Royal Dublin Fusiliers | Born Dublin | |
| O'BRIEN | John | Gunner | Royal Garrison Artillery | Born Dublin | Resided Kensington, Liverpool |
| O'BRIEN | John | Private | Royal Dublin Fusiliers | Born Dublin | Resided Dublin |