| O'Brien | E J | 173 | Private | Died of disease. At sea, SS Custodian, 10 March 1902
NSW Unit
Source: South African Field Force Casualty Roll | New South Wales, 1st Battalion Australian Commonwe |
| O'Brien | E J | 2679 | Private | 2nd Battalion
Source: QSA roll | Lancashire Fusiliers |
| O'Brien | E J | 173 | Trooper | Demise: Died of disease 10 Mar 1902
Place: At Sea. SS Custodian
Source: In Memoriam by S Watt | New South Wales, 1st Battalion Australian Commonwe |
| O'Brien | Edmund Donough John | | Brevet Lieutenant Colonel | QSA (5).
Source: QSA medal rolls | 14th (The King's) Hussars |
| O'Brien | Edward | 8135 | | Source: Medal rolls | Canada, 2nd Royal Canadian Regiment of Infantry |
| O'Brien | Edward Dunegh | 72 | Private | Source: OZ-Boer database | West Australia, 2nd Mounted Infantry Contingent |
| O'Brien | Edward Howard | 83 | Private | Source: OZ-Boer database | Victoria, 4th Imperial Contingent |
| O'Brien | Edward Howard | 35 | Corporal | Source: OZ-Boer database | Victoria, 6th Battalion Australian Commonwealth Ho |
| O'Brien | Edward James | 34363 | Private | Source: QSA Medal Rolls | 94th Company, 24th Btn, IY |
| O'Brien | Edward John | 84 | Trooper | Source: Nominal roll in WO127 | Bushveldt Carabineers |
| O'Brien | Edward John | 173 | Trooper | Source: OZ-Boer database | New South Wales, 1st Battalion Australian Commonwe |
| O'Brien | Edwd John | | | Source: WO100/263 | Bushveldt Carabineers |
| O'Brien | Egerton Augustus S | | Captain | QSA (4). Severe Wound, near Pretoria, 11 Jun 00.
Source: QSA medal rolls | 8th (The King's Royal Irish) Hussars |
| O'Brien | Eugene | | Private | Served 23 Mar 00 to 27 Mar 01.
Source: Nominal roll in WO127 | Cape Medical Staff Corps |
| O'Brien | Eugene | | | Source: WO100/285 | Somerset East TG |
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