South African and related defence-force eras recorded on the roll. SAP, SAPS, and SWAPOL are tagged as Forces. Merchant navy and civilian war-dead are left blank. Foreign and Boer units are tagged when the regiment name is unambiguous (e.g. Australian Field Artillery → AUS).
The Union Defence Force was established on 1 July 1912 under the South Africa Defence Act, 1912, after the Union of South Africa (1910). It brought together the colonial and Boer military forces of the Cape, Natal, Transvaal and Orange Free State. The UDF served in the First World War (including German South-West Africa, East Africa, and the Western Front) and the Second World War. It was replaced by the South African Defence Force on 1 November 1957.
Wikipedia| # | Last Name | First Name | Initials | Rank | Regiment | Unit | Date of Death |
|---|---|---|---|---|---|---|---|
| 19204 | O'brien | Thomas Patrick | T P | Private | South African Horse | 3rd | 1916-09-09 |
| 19206 | O'brien | Thomas Vincent | T V | Sergeant | Camp Commandants Staff | Roberts Heights | 1918-08-11 |
| 19207 | O'brien | William Robert | W R | Lance Corporal | 2nd South African Infantry | 1918-05-04 | |
| 5588 | O'brien Despard | William Hugh | W H | Corporal | South African Mounted Rifles | 3rd Regiment | 1920-01-07 |
| 19213 | O'connell | Daniel | D | Private | 1st South African Infantry | 1918-10-26 | |
| 19214 | O'connell | Douglas Charles | D C | Private | 8th South African Infantry | 1917-07-19 | |
| 19215 | O'connell | Edward Thomas | E T | Private | 12th South African Infantry | 1917-05-25 | |
| 19216 | O'connell | William Joseph Andrew | W J A | Private | Essential Services Protection Corps (Corps) | 1943-11-17 | |
| 19218 | O'connor | Clarence Frederick Reid | C F R | Private | 2nd South African Infantry | "B" Coy. | 1916-07-18 |
| 19219 | O'connor | C G | Gunner | South African Artillery (Corps) | 1942-11-28 | ||
| 19220 | O'connor | Daniel | D | Private | 4th South African Infantry | 1917-04-09 | |
| 19221 | O'connor | Daniel William | D W | Corporal | South African Armoured Corps (Corps) | 3rd Reconnaissance Bn. | 1942-06-22 |
| 19222 | O'connor | F A | Lieutenant | 4 Squadron | 1944-07-13 | ||
| 19223 | O'connor | Gilbert Rademan | G R | Major | South African Army Postal Corps (Corps) | 1942-11-29 | |
| 19225 | O'connor | John | J | Private | 3rd South African Infantry | "B" Coy. | 1916-08-02 |
| 19226 | O'connor | James Mathew | J M | Lance Corporal | 9th Infantry (Prince of Wales' Own Regiment of Cape Peninsula Rifles) | 1920-11-04 | |
| 19227 | O'connor | Robert Emmet | R E | Private | 1st South African Infantry | 1918-10-12 | |
| 19229 | O'connor | Stephen James | S J | Private | 1st South African Infantry | "B" Coy. | 1916-07-16 |
| 19239 | O'cully | Patrick | P | Private | South African Horse | 4th | 1918-11-13 |
| 19240 | O'daly | Charles Nicholas Frederick | C N F | Dresser | South African Veterinary Corps (Corps) | 1917-05-04 | |
| 19242 | O'dea | Daniel | D | Corporal | Technical Service Corps (Corps) | 1943-04-08 | |
| 19243 | O'dea | John | J | Corporal | South African Field Post and Telegraph Corps (Corps) | 1917-03-02 | |
| 19244 | O'dea | Peter | P | Private | 1st South African Infantry | "C" Coy. | 1916-10-22 |
| 19245 | O'dea | Peter Andrew | P A | Corporal | Natal Mounted Rifles | 1944-06-26 | |
| 19246 | O'dell | D F | Private | Technical Service Corps (Corps) | 1947-06-26 | ||
| 19253 | O'donnell | James | J | Private | South African Horse | 1st | 1918-01-23 |
| 19254 | O'donnell | Patrick Rhodes | P R | Warrant Officer Class II | Imperial Light Horse | 1942-07-13 | |
| 19255 | O'donoghue | James Michael | J M | Corporal | Prince Alfred's Guard | 1942-07-07 | |
| 19256 | O'donoghue | James Patrick | J P | Trooper | Prince Alfred's Guard | 1944-06-12 | |
| 19257 | O'donoghue | Patrick Roderick | P R | Private | 9th South African Infantry | "B" Coy. | 1916-12-03 |
| 19258 | O'donoghue | Philip Stephen | P S | Sergeant | 2nd South African Infantry | 1917-04-12 | |
| 19280 | O'gorman | Cyril John | C J | Lance Corporal | 2nd South African Infantry | 1918-04-21 | |
| 19282 | O'halloran | John Patrick | J P | Sergeant Major | South African Rifles | 2nd | 1917-06-22 |
| 19284 | O'hara | James Bernard | J B | Staff Sergeant | Camp Commandants Staff | Dispersal Camp Maitland | 1921-06-16 |
| 19287 | O'keefe | Terence Desmond | T D | Warrant Officer Class I | 31 Squadron | 1944-08-15 | |
| 19288 | O'kelly | Thomas | T | Private | 2nd South African Infantry | 1918-10-28 | |
| 19289 | O'kennedy | John Morgan | J M | Private | 2nd South African Infantry | 1918-03-23 | |
| 19304 | O'leary | Kevin Leahy | K L | Captain | South African Air Force (Corps) | 1945-07-08 | |
| 19378 | O'meara | Bulkeley Ernest Adolphus | B E A | Captain | East African Unattached List | South African Intelligence Corps | 1916-08-31 |
| 19379 | O'meara | John | J | Sergeant | 5th South African Infantry | "D" Coy. | 1916-11-11 |
| 19380 | O'meara | James Justin | J J | Corporal | 6th South African Infantry | 1916-12-09 | |
| 19381 | O'meara | Michael Henry | M H | Corporal | 2nd South African Infantry | 1918-03-24 | |
| 19384 | O'neil | G F | Sapper | South African Engineer Corps (Corps) | 1945-08-27 | ||
| 19385 | O'neil | J P | Private | Regiment Botha | 2nd | 1941-12-09 | |
| 19386 | O'neill | Charles Cecil | C C | Private | 2nd South African Infantry | 1916-07-18 | |
| 19387 | O'neill | Richard Patrick | R P | Private | 4th South African Infantry | 1921-06-12 | |
| 19438 | O'regan | Cyril Dominic | C D | Lance Corporal | Rand Light Infantry | 1941-12-31 | |
| 19439 | O'reilly | Justin | J | Private | 2nd South African Infantry | "D" Coy. | 1918-04-12 |
| 19440 | O'reilly | Keith Henry | K H | Lieutenant | 1 Squadron | 1941-12-17 | |
| 19441 | O'reilly | Patrick | P | Private | 4th South African Infantry | "D" Coy. | 1917-09-21 |