| # | Last Name | First Name | Initials | Rank | Regiment | Date of Death |
|---|---|---|---|---|---|---|
| 19375 | Olwage | David Bonaparte De Villiers | D B d V | Sergeant | Imperial Light Horse/Kimberley Regiment, S.A.Forces | 1944-06-07 |
| 19377 | Olyott | Bernard David | B D | Private | South African Infantry | 1916-10-18 |
| 19394 | Oostermeyer | John James | J J | Private | South African Infantry | 1917-04-09 |
| 19402 | Oosthuizen | Hendrik Jacobus | H J | Air Sergeant | South African Air Force | 1941-08-21 |
| 19403 | Oosthuizen | Hendrik Paul | H P | Lieutenant | South African Air Force | 1944-10-03 |
| 19417 | Oosthuizen | Stephanus Johannes | S J | Lieutenant | Witwatersrand Rifles/Regiment de la Rey, S.A. Forces | 1944-10-13 |
| 32394 | Oosthuizen | Phillipus Jocob Rudolph | P J R | Second Lieutenant | South African Infantry Corps | 1980-03-14 |
| 32396 | Oosthuyse | Hendrik Albertus | H A | Sergeant | South African Artillery | 1983-12-18 |
| 38737 | Oostindien | Johannes Eric | J E | Field Reservist | British South Africa Police | 1979-08-14 |
| 19424 | Openshaw | Herbert Douglas | H D | Private | South African Infantry | 1916-07-16 |
| 19428 | Opperman | Albert Stephen Abraham | A S A | Burgher | Mounted Commandos, S.A. Forces | 1914-11-25 |
| 19430 | Opperman | Daniel Jacobus Elardus | D J E | Burgher | Mounted Commandos, S.A. Forces | 1914-11-08 |
| 32400 | Opperman | Andre Leon | A L | Second Lieutenant | South West African Territory Force | 1978-09-07 |
| 37077 | Opperman | Pieter Johannes | P J | Constable | South African Police | 1983-09-04 |
| 40157 | Orchard | Roydin Clement Charles | R C C | Corporal | Rhodesia Regiment | 1977-07-22 |
| 19436 | Ord | Leonard | L | Corporal | King's Royal Rifle Corps | 1916-08-24 |
| 19437 | Ord-MacKenzie | Douglas Allan | D A | Second Lieutenant | London Regiment (Queen Victoria's Rifles) | 1916-09-24 |
| 19443 | Orffer | Johannes Francois | J F | Private | Cape Town Highlanders, S.A. Forces | 1942-10-24 |
| 19444 | Orford | Stephen Mewburn | S M | Second Lieutenant | King's Royal Rifle Corps | 1916-06-25 |
| 19448 | Orlek | Leslie | L | Flight Sergeant | South African Air Force | 1943-03-20 |
| 19451 | Ormsby | Francis James | F J | Second Lieutenant | Royal Sussex Regiment | 1916-09-03 |
| 19452 | Ormsby | Horatio Nelson | H N | Lieutenant | Cameronians (Scottish Rifles) | 1915-06-02 |
| 19454 | Ornellas | Gabriel | G | Private | Cape Town Highlanders, S.A. Forces | 1942-11-01 |
| 19455 | Orpen | Frank | F | Private | South African Infantry | 1917-02-02 |
| 19460 | Orr | James Miller | J M | Lance Corporal | South African Infantry | 1916-07-10 |
| 19462 | Orr | Ralph Thomas | R T | Bombardier | New Zealand Artillery | 1942-10-25 |
| 19463 | Orr | Robert Watson | R W | Second Lieutenant | London Regiment (London Irish Rifles) | 1915-09-25 |
| 19464 | Orr | Thomas Clarence Field | T C F | Sergeant | Royal Air Force Volunteer Reserve | 1942-09-16 |
| 19472 | Orton | Charles Percy | C P | Able Seaman | South African Naval Forces | 1942-04-05 |
| 19474 | Orton | Willie | W | Private | South African Infantry | 1918-07-21 |
| 19476 | Osborne | Ernest William | E W | Private | South African Infantry | 1918-04-10 |
| 19480 | Osborne | Robert Lionel | R L | Second Lieutenant | Royal Fusiliers | 1916-07-07 |
| 32408 | Osborne | Nigel David | N D | Lieutenant | South African Air Force | 1979-09-06 |
| 19484 | Oschmann | Julius Hendrik | J H | Private | South African Infantry | 1918-03-22 |
| 32409 | Osler | Nigel David | F | Trooper | Bechuanaland Border Police | 1979-09-06 |
| 37078 | Osmond | Arno | A | South African Police | 1981-11-03 | |
| 40160 | Osteni | Toto | T | District Security Assistant | Internal Affairs | 1979-05-05 |
| 19497 | Oswald | Bertie Hales | B H | Gunner | South African Artillery | 1942-05-28 |
| 19498 | Oswald | William | W | Second Lieutenant | South African Air Force | 1943-11-03 |
| 19501 | Otten | Edward | E | Private | Natal Mounted Rifles, S.A. Forces | 1942-06-15 |
| 19503 | Ottley | Glendower George | G G | Major | Royal Fusiliers | 1916-09-03 |
| 19505 | Otto | Henry Vaughan | H V | Private | Royal Natal Carbineers, S.A. Forces | 1942-04-13 |
| 19507 | Otto | John Murray | J M | Corporal | Pretoria Regiment, S.A. Forces | 1944-07-17 |
| 19509 | Otto | Phillipus Jurie Wynand | P J W | Lance Corporal | Pretoria Regiment, S.A. Forces | 1944-07-27 |
| 19510 | Otto | Peter Carel De Bruyn | P C D B | Lieutenant | South African Air Force | 1944-02-20 |
| 37081 | Otto | Rudolf Nicolaas | R N | Constable | South African Police | 1973-10-03 |
| 19516 | Oughterson | Hugh George | H G | Lieutenant | South African Infantry | 1916-07-07 |
| 32414 | Oukongo | Matheus | M | Special Constable | South West African Police | 1985-03-06 |
| 19517 | Oulton | Harry Charles | H C | Second Lieutenant | Leinster Regiment | 1917-04-12 |
| 19520 | Ovens | James | J | Corporal | South African Mounted Rifles | 1914-09-26 |