| Surname | Forename | Rank | Unit | Born | Resided |
| MULCAHY | Dominic | Private | Highland Light Infantry | Born Dublin | Resided Dublin |
| MULDOWNEY | Michael | Private | Lancashire Fusiliers | Born Dublin | |
| MULHALL | John Joseph | Signalman | H.M. Submarine "E50" | | |
| MULHALL | Bernard | Private | Royal Munster Fusiliers | Born Dublin | Resided Dublin |
| MULHALL | John | Private | Connaught Rangers | Born Booterstown, Co. Dublin | Resided Dublin |
| MULHALL | John | Private | Royal Dublin Fusiliers | Born Dublin | |
| MULHALL | Patrick | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |
| MULHALL | Thomas | Private | Royal Dublin Fusiliers | Born Rathmines, Dublin | |
| MULHOLLAND | Henry Arthur | Private | 75th Battalion, Canadian Infantry (Central Ontario Regiment) | | |
| MULLEN | William | Engineman | H.M. Trawler "Sealark II" | Native of Killiney, Co. Dublin | |
| MULLEN | Edward | Private | Connaught Rangers | Born Dublin | Resided Kilburn, N.W.6 |
| MULLEN | John | Lance Corporal | Princess Victoria's (Royal Irish Fusiliers) | Born Dublin | |
| MULLEN | John | Private | London Regiment | Born Dublin | Resided Aberdeen |
| MULLEN | John | Sergeant | Royal Irish Rifles | Born Rathmines, Co. Dublin | |
| MULLEN | Joseph | Private | Princess Victoria's (Royal Irish Fusiliers) | Born Ballybrack, Co. Dublin | Resided Dun Laoghaire, Co. Dublin |
| MULLEN | Patrick | Private | Princess Victoria's (Royal Irish Fusiliers) | Born Dublin | |
| MULLEN | Sylvester | Lance Sergeant | Royal Dublin Fusiliers | Born Dublin | |
| MULLIGAN | Alexander | Private | Royal Inniskilling Fusiliers | Born Drumcondra, Co. Dublin | |
| MULLIGAN | Christopher | Rifleman | Royal Irish Rifles | Born Dublin | |
| MULLIGAN | Henry | Private | Royal Army Service Corps | Born Dublin | Resided Dublin |
| MULLIGAN | John | Private | Royal Dublin Fusiliers | Born Dublin | |
| MULLIGAN | Nicholas | Private | Royal Dublin Fusiliers | Born Dublin | |
| MULLIGAN | Simon | Private | Royal Dublin Fusiliers | Born Dun Laoghaire, Co. Dublin | |
| MULLINS | Edward | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |
| MULRAIN | Peter | Private | Royal Irish Regiment | Born St. James', Dublin | Resided Kilmainham, Co. Dublin |
| MULRANEY | William | Private | Household Cavalry and Cavalry of the Line (including Yeomanry) | Born Broadpool | Resided Dublin |
| MULROONEY | Edward | Acting Corporal | Princess Victoria's (Royal Irish Fusiliers) | Born Dublin | |
| MULROONEY | James | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |
| MULVANEY | Patrick | Private | Royal Dublin Fusiliers | Born Finglas, Co. Dublin | |
| MULVANNEY | James | Private | Princess Victoria's (Royal Irish Fusiliers) | Born Dun Laoghaire, Co. Dublin | |
| MULVEY | William | Private | Labour Corps | Born Little Bray, Co. Dublin | Resided Little Bray |
| MUNRO | Hector Hugh | Lance Sergeant | Royal Fusiliers (City of London Regiment) | Born British, Burma | Resided Dublin |
| MUNROE | Michael | Private | King's (Liverpool Regiment) | Born Limerick | Resided Dublin |
| MUNSTER | John | Rifleman | Royal Irish Rifles | Born Dublin | |
| MURDIFF | John | Private | 1st Australian Light Trench Mortar Battery | Native of Dún Laoghaire, Co. Dublin | |
| MURNANE | Joseph | Private | Royal Dublin Fusiliers | Born Dublin | |
| MURPHY | George Alexander | Private | 2nd Battalion, Auckland Regiment, New Zealand Expeditionary Force | | |
| MURPHY | Leo | Private | 21st Battalion, Canadian Infantry (Eastern Ontario Regiment) | | |
| MURPHY | Bernard | Fireman | S.S. "Leinster" (Dublin) | | |
| MURPHY | James Edward | Boy 1st Class | H.M.S. "Albion" | Born in Williamstown, Co, Dublin | |
| MURPHY | Joseph Pierce | Signalman | H.M.S. "Amphion" | | |
| MURPHY | Thomas | Fireman | S.S. "W. M. Barkley" (Belfast) | Born in Dublin | |
| MURPHY | William | Fireman | S.S. "Calista" (Glasgow) | Born in Dublin | |
| MURPHY | James Neville Herbert | Second Lieutenant | 5th Battalion, attached 2nd Battalion, Royal Dublin Fusiliers | | |
| MURPHY | Alexander | Private | Royal Dublin Fusiliers | Born Dublin | |
| MURPHY | Andrew | Private | Connaught Rangers | Born Dublin | Resided Dublin |
| MURPHY | Andrew | Private | Royal Dublin Fusiliers | Born Dublin | |
| MURPHY | Anthony | Private | Royal Dublin Fusiliers | Born Dublin | |
| MURPHY | Bernard | Private | Royal Inniskilling Fusiliers | Born St. Catherines, Dublin | |
| MURPHY | Bernard | Private | Prince of Wales's Leinster Regiment (Royal Canadians) | Born Dublin | |