| O'Leary | J | 5627 | Private | Slightly wounded. Warrenton, 4 April 1900
1st Battalion.
Source: South African Field Force Casualty Roll |
| O'Leary | M | 5552 | Private | 1st Battalion
Demise: Died of disease 27 May 1900
Place: Boshof
Source: In Memoriam by S Watt |
| O'Leary | P | | | 1st Battalion
Source: Medal rolls |
| O'Leavy | D | | | 2nd Battalion
Source: Medal rolls |
| O'Leavy | M | | | 2nd Battalion
Source: Medal rolls |
| O'Loughlin | S | | | 1st Battalion
Source: Medal rolls |
| O'Loughlin | T | | | 2nd Battalion
Source: Medal rolls |
| O'Mahoney | C | | | 1st Battalion
Source: Medal rolls |
| O'Mahoney | J | | | 2nd Battalion
Source: Medal rolls |
| O'Mahoney | T | | | 1st Battalion
Source: Medal rolls |
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