| Person # | Last Name | First Name | Initials | Rank | Year |
|---|---|---|---|---|---|
| 19227 | O'Connor | Robert Emmet | R E | Private | 1918 |
| 19228 | O'Connor | Robert John | R J | Flight Sergeant | 1943 |
| 19229 | O'Connor | Stephen James | S J | Private | 1916 |
| 32356 | O'Connor | Walter Donald | W D | Rifleman | 1979 |
| 19239 | O'Cully | Patrick | P | Private | 1918 |
| 19240 | O'Daly | Charles Nicholas Frederick | C N F | Dresser | 1917 |
| 19242 | O'Dea | Daniel | D | Corporal | 1943 |
| 19243 | O'Dea | John | J | Corporal | 1917 |
| 19244 | O'Dea | Peter | P | Private | 1916 |
| 19245 | O'Dea | Peter Andrew | P A | Corporal | 1944 |
| 19246 | O'Dell | D F | Private | 1947 | |
| 19253 | O'Donnell | James | J | Private | 1918 |
| 19254 | O'Donnell | Patrick Rhodes | P R | Warrant Officer Class II | 1942 |
| 19255 | O'Donoghue | James Michael | J M | Corporal | 1942 |
| 19256 | O'Donoghue | James Patrick | J P | Trooper | 1944 |
| 19257 | O'Donoghue | Patrick Roderick | P R | Private | 1916 |
| 19258 | O'Donoghue | Philip Stephen | P S | Sergeant | 1917 |
| 40150 | O'Donovan | John Finbarr Gerard | J F G | Patrol Officer | 1972 |
| 40151 | O'Driscoll | Gary Arthur | G A | Corporal | 1977 |
| 19270 | O'Farrell | Maurice | M | Driver | 1915 |
| 32365 | O'Gorman | Brian Alphonso | B A | Airman | 1965 |
| 19280 | O'Gorman | Cyril John | C J | Lance Corporal | 1918 |
| 19282 | O'Halloran | John Patrick | J P | Sergeant Major | 1917 |
| 19283 | O'Hanlon | Richard | R | Corporal | 1916 |
| 19284 | O'Hara | James Bernard | J B | Staff Sergeant | 1921 |
| 19287 | O'Keefe | Terence Desmond | T D | Warrant Officer Class I | 1944 |
| 19288 | O'Kelly | Thomas | T | Private | 1918 |
| 19289 | O'Kennedy | John Morgan | J M | Private | 1918 |
| 19304 | O'Leary | Kevin Leahy | K L | Captain | 1945 |
| 19378 | O'Meara | Bulkeley Ernest Adolphus | B E A | Captain | 1916 |
| 19380 | O'Meara | James Justin | J J | Corporal | 1916 |
| 19379 | O'Meara | John | J | Sergeant | 1916 |
| 19381 | O'Meara | Michael Henry | M H | Corporal | 1918 |
| 19384 | O'Neil | G F | Sapper | 1945 | |
| 19385 | O'Neil | J P | Private | 1941 | |
| 19383 | O'Neil | Frederick | F | Second Lieutenant | 1916 |
| 19386 | O'Neill | Charles Cecil | C C | Private | 1916 |
| 40153 | O'Neill | Gert Stephanus | G S | Trooper | 1979 |
| 32382 | O'Neill | Johannes Albertus | J A | Private | 1982 |
| 40154 | O'Neill | Keith | K | Private | 1977 |
| 40155 | O'Neill | Michael Patrick | M P | Staff Sergeant | 1969 |
| 19387 | O'Neill | Richard Patrick | R P | Private | 1921 |
| 19438 | O'Regan | Cyril Dominic | C D | Lance Corporal | 1941 |
| 19439 | O'Reilly | Justin | J | Private | 1918 |
| 19440 | O'Reilly | Keith Henry | K H | Lieutenant | 1941 |
| 19441 | O'Reilly | Patrick | P | Private | 1917 |
| 40159 | O'Reilly | Patrick Malcolm | P M | Lance Corporal | 1976 |
| 40158 | O'Reilly | Peter Albertus | P A | Acting Sergeant | 1975 |
| 19442 | O'Reilly | William Patrick | W P | Private | 1918 |
| 19447 | O'Riordan | Terence | T | Gunner | 1942 |