| O'Connell | D W R | 40195 | Private | Slightly wounded. Klipdrift, 7 March 1902
Source: South African Field Force Casualty Roll |
| O'Connell | Daniel William | | | Source: Attestation paper in WO126 |
| O'Connell | Daniel William Ross | 40195 | Trooper | Served 13 Jan 02 to 24 Mar 02. Discharged, Kimberley, disbandment of corps
Source: Nominal roll in WO127 |
| O'Shaughnessy | James | | | Source: Attestation paper in WO126 |
| O'Shaughnessy | James | 40231 | Trooper | Served 29 Jan 02 to 24 Mar 02. Discharged, Kimberley, disbandment of corps
Source: Nominal roll in WO127 |
| Ovens | D | 40246 | Private | Demise: Killed in action 07 Mar 1902
Place: De Klipdrift. Gt Harts River
Source: In Memoriam by S Watt |
| Ovens | D | 40246 | Private | Killed in action. Klipdrift, 7 March 1902
Source: South African Field Force Casualty Roll |
| Ovens | David | | | Source: Attestation paper in WO126 |
| Ovens | David | 40246 | Trooper | Served 31 Feb 02 to 07 Mar 02. Killed, Klip Drift
Source: Nominal roll in WO127 |
| Overend | Horace George | | | Source: Attestation paper in WO126 |
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