| Name (1649 results) | Rank | Regiment |
|---|---|---|
| O'Ferrall, Brendan Hynds | Second Lieutenant | Royal Field Artillery |
| O'Gowan, Robert Wanless | Major GeneraI | |
| O'Hara, Henry Desmond | Captain | 1st Batt. Royal Dublin Fusiliers |
| O'Kane, Paul | Lieutenant | Royal Irish Rifles |
| O'Keeffe, Marcus Menus | Captain | Royal Field Artillery |
| O'Keeffe, W.H. | Lieutenant | Royal Field Artillery |
| O'Keeffe, M. W. | Surgeon | Royal Army Medical Corps |
| O'Keeffe, John Joseph | Captain | Army Service Corps |
| O'Kelly, H. K. | Lieutenant | |
| O'Kelly, Christopher Patrick John | Lieutenant | Canadian Infantry |