| # | Last Name | First Name | Initials | Rank | Regiment | Country | Date of Death |
|---|---|---|---|---|---|---|---|
| 19283 | O'hanlon | Richard | R | Corporal | Royal Irish Regiment | France | 1916-08-12 |
| 19486 | O'shea | Christopher Joseph | C J | Private | 2nd South African Infantry | France | 1918-04-15 |
| 19487 | O'shea | Harry Arthur | H A | Lieutenant | Royal Air Force | France | 1918-08-14 |
| 19272 | Officer | Cecil | C | Private | 1st South African Infantry | France | 1917-04-06 |
| 19296 | Oldfield | Ernest Francis | E F | Sergeant | 3rd South African Infantry | France | 1916-08-29 |
| 19298 | Oldham | Dudley Castle | D C | Private | 3rd South African Infantry | France | 1917-04-20 |
| 19300 | Oldham | Milton | M | Corporal | King's Royal Rifle Corps | France | 1918-07-05 |
| 40485 | Oldman | Wilfred Southey Deare | W S D | Captain | Royal Berkshire Regiment | France | 1915-09-25 |
| 19330 | Oliver | Egbert Conrad | E C | Lieutenant | Royal Naval Volunteer Reserve | France | 1917-02-05 |
| 19368 | Olsen | Edward | E | Private | 4th South African Infantry | France | 1917-04-09 |
| 19377 | Olyott | Bernard David | B D | Private | 1st South African Infantry | France | 1916-10-18 |
| 19394 | Oostermeyer | John James | J J | Private | 4th South African Infantry | France | 1917-04-09 |
| 19453 | Ormsby | Richard Gilbert | R G | Private | 1st King Edward's Horse | France | 1918-10-19 |
| 19455 | Orpen | Frank | F | Private | 2nd South African Infantry | France | 1917-02-02 |
| 19463 | Orr | Robert Watson | R W | Second Lieutenant | London Regiment (London Irish Rifles) | France | 1915-09-25 |
| 19466 | Orsmond | Ernest | E | Private | 2nd South African Infantry | France | 1916-10-27 |
| 19517 | Oulton | Harry Charles | H C | Second Lieutenant | Leinster Regiment | France | 1917-04-12 |
| 19567 | Page | Cyril | C | Bombardier | Royal Garrison Artillery | France | 1917-12-05 |
| 19594 | Palmer | Arthur Percy | A P | Captain | Welsh Guards | France | 1915-09-27 |
| 19637 | Papworth | Alfred Wyatt | A W | Second Lieutenant | Royal Engineers | France | 1917-04-02 |
| 19653 | Parker | Charles | C | Gunner | South African Heavy Artillery | France | 1917-04-19 |
| 19659 | Parker | Leslie Thomas | L T | Private | 3rd South African Infantry | France | 1916-07-24 |
| 19666 | Parker | Walter | W | Corporal | Royal Field Artillery | France | 1916-05-16 |
| 19700 | Parsons | Forrest Gale | F G | Second Lieutenant | Royal Flying Corps | France | 1916-10-26 |
| 19717 | Pascoe | Albert Henry | A H | Private | Grenadier Guards | France | 1918-08-20 |
| 19719 | Pascoe | Eric John | E J | Second Lieutenant | Royal Flying Corps | France | 1917-04-14 |
| 19739 | Pater | Gordon Raymond | G R | Private | 4th South African Infantry | France | 1916-10-12 |
| 19743 | Paterson | John | J | Private | 4th South African Infantry | France | 1917-04-13 |
| 19756 | Paton | David Moir | D M | Lieutenant | Royal Flying Corps | France | 1917-09-24 |
| 19809 | Pautz | William Albert | W A | Private | 4th South African Infantry | France | 1918-07-20 |
| 19816 | Paxton | Robert Henry | R H | Private | 2nd South African Infantry | France | 1917-04-09 |
| 19818 | Payn | Frank Young | F Y | Gunner | South African Heavy Artillery | France | 1917-10-12 |
| 19822 | Payne | Albert Clarence | A C | Private | 2nd South African Infantry | France | 1916-10-12 |
| 19853 | Peacocke | Eric Forrester | E F | Second Lieutenant | King's Royal Rifle Corps | France | 1917-05-20 |
| 19874 | Pearce | William Hendrick Ernest | W H E | Private | 1st South African Infantry | France | 1916-12-08 |
| 19884 | Pearse | Walter Josiah | W J | Second Lieutenant | Royal Horse Artillery | France | 1917-04-09 |
| 19926 | Pemberton | Christopher Guy | C G | Private | 2nd South African Infantry | France | 1917-04-12 |
| 19928 | Pender | William Gordon | W G | Captain | Royal Flying Corps | France | 1917-08-15 |
| 19946 | Penny | Hilton | H | Sergeant | South African Heavy Artillery | France | 1917-04-28 |
| 19949 | Penrose | Keith | K | Second Lieutenant | Royal Air Force | France | 1918-09-03 |
| 19965 | Percy | David Hume | D H | Private | 3rd South African Infantry | France | 1917-04-09 |
| 19972 | Perkins | Arthur | A | Private | 4th South African Infantry | France | 1916-10-12 |
| 19974 | Perkins | Ebenezer John | E J | Private | 3rd South African Infantry | France | 1916-09-19 |
| 19977 | Perkins | Norman Frank | N F | Private | 1st South African Infantry | France | 1917-04-09 |
| 19987 | Perrins | Frank Henry Walter | F H W | Private | King's Royal Rifle Corps | France | 1915-09-25 |
| 20012 | Peters | Albert | A | Private | 3rd South African Infantry | France | 1917-09-11 |
| 20029 | Peters | Rutland John | R J | Gunner | South African Heavy Artillery | France | 1918-05-15 |
| 20066 | Petersen | John | J | Driver | Cape Auxiliary Horse Transport | France | 1919-01-15 |
| 20079 | Petersen | Victor Record | V R | Private | 2nd South African Infantry | France | 1917-04-12 |
| 20104 | Pettit | Alfred Thomas Henry | A T H | Private | 4th South African Infantry | France | 1917-04-09 |