| # | Last Name | First Name | Initials | Rank | Regiment | Locality | Date of Death |
|---|---|---|---|---|---|---|---|
| 19568 | Page | Ernest | E | Lance Sergeant | Royal Inniskilling Fusiliers | Somme | 1918-03-21 |
| 19570 | Page | James Harold | J H | Private | South African Medical Corps | Somme | 1917-12-07 |
| 19560 | Paddon | Edwin Evens Cragg | E E C | Lance Corporal | South African Infantry | Somme | 1916-07-18 |
| 19561 | Paddon | George William | G W | Sergeant | Royal Fusiliers | Somme | 1917-02-17 |
| 19557 | Paddock | Alexander Charles | A C | Private | South African Infantry | Somme | 1916-10-18 |
| 19558 | Paddock | James Rex | J R | Private | South African Infantry | Seine-Maritime | 1918-10-14 |
| 19549 | Paardewachter | Arend | A | Driver | Cape Auxiliary Horse Transport | Nord | 1919-02-19 |
| 19536 | Owen | James Edward | J E | Private | South African Infantry | Somme | 1916-07-18 |
| 19527 | Overton | Garnet Ewart | G E | Private | South African Infantry | Somme | 1916-10-19 |
| 19523 | Overgage | George Edwin | G E | Lance Corporal | South African Infantry | Aisne | 1918-10-08 |
| 19518 | Outram | Ernest White | E W | Company Sergeant Major | South African Infantry | Somme | 1916-10-12 |
| 19517 | Oulton | Harry Charles | H C | Second Lieutenant | Leinster Regiment | Pas de Calais | 1917-04-12 |
| 19516 | Oughterson | Hugh George | H G | Lieutenant | South African Infantry | Somme | 1916-07-07 |
| 19503 | Ottley | Glendower George | G G | Major | Royal Fusiliers | Somme | 1916-09-03 |
| 19499 | Oswald | William Digby | W D | Lieutenant Colonel | 5th Dragoon Guards (Princess Charlotte of Wales's) | Somme | 1916-07-16 |
| 19494 | Osmond | Reuben Harding | R H | Lance Corporal | South African Infantry | Somme | 1918-03-27 |
| 19484 | Oschmann | Julius Hendrik | J H | Private | South African Infantry | Somme | 1918-03-22 |
| 19480 | Osborne | Robert Lionel | R L | Second Lieutenant | Royal Fusiliers | Somme | 1916-07-07 |
| 19474 | Orton | Willie | W | Private | South African Infantry | Nord | 1918-07-21 |
| 19466 | Orsmond | Ernest | E | Private | South African Infantry | Pas de Calais | 1916-10-27 |
| 19460 | Orr | James Miller | J M | Lance Corporal | South African Infantry | Somme | 1916-07-10 |
| 19463 | Orr | Robert Watson | R W | Second Lieutenant | London Regiment (London Irish Rifles) | Pas de Calais | 1915-09-25 |
| 19455 | Orpen | Frank | F | Private | South African Infantry | Pas de Calais | 1917-02-02 |
| 19451 | Ormsby | Francis James | F J | Second Lieutenant | Royal Sussex Regiment | Somme | 1916-09-03 |
| 19453 | Ormsby | Richard Gilbert | R G | Private | 1st King Edward's Horse | Pas de Calais | 1918-10-19 |
| 19437 | Ord-MacKenzie | Douglas Allan | D A | Second Lieutenant | London Regiment (Queen Victoria's Rifles) | Somme | 1916-09-24 |
| 19436 | Ord | Leonard | L | Corporal | King's Royal Rifle Corps | Somme | 1916-08-24 |
| 19424 | Openshaw | Herbert Douglas | H D | Private | South African Infantry | Somme | 1916-07-16 |
| 19394 | Oostermeyer | John James | J J | Private | South African Infantry | Pas de Calais | 1917-04-09 |
| 19377 | Olyott | Bernard David | B D | Private | South African Infantry | Pas de Calais | 1916-10-18 |
| 19368 | Olsen | Edward | E | Private | South African Infantry | Pas de Calais | 1917-04-09 |
| 19329 | Oliver | Edgar Alexander | E A | Second Lieutenant | Royal Fusiliers | Somme | 1916-07-27 |
| 19330 | Oliver | Egbert Conrad | E C | Lieutenant | Royal Naval Volunteer Reserve | Pas de Calais | 1917-02-05 |
| 40485 | Oldman | Wilfred Southey Deare | W S D | Captain | Royal Berkshire Regiment | Pas de Calais | 1915-09-25 |
| 19298 | Oldham | Dudley Castle | D C | Private | South African Infantry | Pas de Calais | 1917-04-20 |
| 19300 | Oldham | Milton | M | Corporal | King's Royal Rifle Corps | Pas de Calais | 1918-07-05 |
| 19296 | Oldfield | Ernest Francis | E F | Sergeant | South African Infantry | Pas de Calais | 1916-08-29 |
| 19272 | Officer | Cecil | C | Private | South African Infantry | Pas de Calais | 1917-04-06 |
| 19173 | Oates | Joshua Laurence | J L | Sub-Lieutenant | Royal Naval Volunteer Reserve | Somme | 1916-11-13 |
| 19486 | O'shea | Christopher Joseph | C J | Private | South African Infantry | Pas de Calais | 1918-04-15 |
| 19487 | O'shea | Harry Arthur | H A | Lieutenant | Royal Air Force | Pas de Calais | 1918-08-14 |
| 19386 | O'neill | Charles Cecil | C C | Private | South African Infantry | Somme | 1916-07-18 |
| 19383 | O'neil | Frederick | F | Second Lieutenant | Royal Dublin Fusiliers | Somme | 1916-11-13 |
| 19381 | O'meara | Michael Henry | M H | Corporal | South African Infantry | Somme | 1918-03-24 |
| 19289 | O'kennedy | John Morgan | J M | Private | South African Infantry | Somme | 1918-03-23 |
| 19283 | O'hanlon | Richard | R | Corporal | Royal Irish Regiment | Pas de Calais | 1916-08-12 |
| 19258 | O'donoghue | Philip Stephen | P S | Sergeant | South African Infantry | Pas de Calais | 1917-04-12 |
| 19244 | O'dea | Peter | P | Private | South African Infantry | Seine-Maritime | 1916-10-22 |
| 19217 | O'connor | Arthur Cathal | A C | Captain | Norfolk Regiment | Somme | 1916-07-27 |
| 19218 | O'connor | Clarence Frederick Reid | C F R | Private | South African Infantry | Somme | 1916-07-18 |