| O'Loghlen | Bryan James | 547 | Private | Source: OZ-Boer database | Victoria, 3rd Bushman's Contingent |
| O'Loghlen | P | | | Source: WO100/146 | No 10 Mountain Battery, RGA |
| O'Loghlen | P | | | Source: QSA and KSA medal rolls | No 10 Mountain Battery, RGA |
| O'Loghlen | P | 10988 | Gunner | Missing - released at Nicholson's Nek. 30 Oct 1899.
Source: Natal Field Force Casualty Roll, page 29 line 23 | No 10 Mountain Battery, RGA |
| O'Lone | Edward | | | 2nd Battalion
Source: QSA and KSA medal rolls | Royal Inniskilling Fusiliers |
| O'Lone | J | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Scots (Lothian Regiment) |
| O'Lone | O | | | 1st Battalion
Source: QSA and KSA medal rolls | Royal Inniskilling Fusiliers |
| O'Longhlin | M | | | 4th Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| O'Longhlin | Martin | | | Source: QSA and KSA medal rolls | 84th Battery, RFA |
| O'Loole | R | | | 4th Battalion
Source: QSA and KSA medal rolls | Royal Dublin Fusiliers |
| O'Loughlan | James William | 1009 | Private | Source: OZ-Boer database | Victoria, 5th Mounted Rifles Contingent |
| O'Loughlin | | 5197 | Private | Died of disease. Nooitgedacht, 18 June 1900
2nd Battalion.
Source: South African Field Force Casualty Roll | (Princess Victoria's) Royal Irish Fusiliers |
| O'Loughlin | C | 2537 | Private | Demise: Died of disease 04 Apr 1902
Place: Standerton
Source: In Memoriam by S Watt | New South Wales, 3rd Contingent NSW Imperial Bushm |
| O'Loughlin | C | 25472 | Private | Died of disease. Standerton, 4 April 1902
Bushmen
Source: South African Field Force Casualty Roll | New South Wales contingent |
| O'Loughlin | Charles | 2537 | Trooper | Source: OZ-Boer database | New South Wales, 3rd Contingent NSW Imperial Bushm |
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