| O'Neill | Patrick Lawrence | 24820 | Sergeant | Coronation Contingent, Discharged 19 Aug 1902 London
Source: Nominal roll in WO127 |
| O'Rorke | Luke William | 5540 | Trooper | Discharged 13 Aug 1900 Transferred to Police Heidelburg
Source: Nominal roll in WO127 |
| O'Shea | Lawrence | 5016 | Trooper | Source: Nominal roll in WO127 |
| O'Shea | Michael | 2007 | OR/Sergeant | Discharged 31 Mar 190, Returned to Regt
Source: Nominal roll in WO127 |
| O'Toole | Patrick | 5575 | Trooper | Source: Nominal roll in WO127 |
| Oak | Arthur Charles | 6614 | Trooper | Source: Nominal roll in WO127 |
| Oakden | Charles Vivian | 43730 | Trooper | Supernumerary 29 Oct 1900
Source: Nominal roll in WO127 |
| Oddy | A | 1017 | Private | Killed at Rooi Kop. 6 Sep 1900.
Source: Natal Field Force Casualty Roll, page 235 line 3 |
| Oddy | A | 1017 | Private | Demise: Killed in action 06 Sep 1900
Place: Rooikop
Source: In Memoriam by S Watt |
| Oddy | Arthur | 1017 | Trooper | Killed Spion Kop 6 Sep 1900
Source: Nominal roll in WO127 |
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