| Oertel | Reginald Ernest | 8104 | Trooper | Discharged 9 Nov 1900 at own request
Source: Nominal roll in WO127 |
| Ogilvie | Patrick Alexander | | Lieutenant | Resigned 7 May1901
Source: Nominal roll in WO127 |
| Ohesson | John | 50753 | Trooper | Source: Nominal roll in WO127 |
| Olsen | Martin Andrew | 206 | Trooper | Source: Nominal roll in WO127 |
| Oppenheim | Lawrence Charles | | Lieutenant | Resigned 31 Sep 1900
Source: Nominal roll in WO127 |
| Otto | W | | Lieutenant | Severely wounded at Colenso. 15 Dec 1899.
Source: Natal Field Force Casualty Roll, page 232 line 2 |
| Otto | William | | Lieutenant | Resigned Appt 31 Oct 1901
Source: Nominal roll in WO127 |
| Ousley | Edward Bradford | 4887 | Corporal | Discharged 9 Nov 1900 at own request
Source: Nominal roll in WO127 |
| Ousley | Joseph | 9243 | Lieutenant | Resigned 29 Nov 1900
Source: Nominal roll in WO127 |
| Pace | Thomas | 8550 | Trooper | Discharged 9 Nov 1900 at own request
Source: Nominal roll in WO127 |
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