| O'Brien | T | | | 5th Battalion
Source: QSA and KSA medal rolls | Manchester Regiment |
| O'Brien | T | | Sailmaker's Mate | QSA (0). Ref: ( • ).
Source: QSA medal rolls | HMS Monarch |
| O'Brien | T | | | 4th Battalion
Source: QSA and KSA medal rolls | King's Royal Rifle Corps |
| O'Brien | T | 5205 | Private | 6th Battalion
Source: QSA roll | Lancashire Fusiliers |
| O'Brien | T | | Trooper | Missing in action. Near Lindique, 20 May 1901
Rejoined
Source: South African Field Force Casualty Roll | Driscoll's Scouts |
| O'Brien | T | 3377 | Private | Prisoner. Near Derdepoort, 11 July 1900
Released
Source: South African Field Force Casualty Roll | 7th (The Princess Royal's) Dragoon Guards |
| O'Brien | T | 5451 | Private | Slightly wounded. Winburg, 23 May 1901
1st Battalion. MI
Source: South African Field Force Casualty Roll | Royal Munster Fusiliers |
| O'Brien | T | 49152 | Private | 2nd Battalion
Demise: Died 22 Sep 1902
Place: Volksrust?
Source: In Memoriam by S Watt | Prince of Wales's Leinster Regiment (Royal Canadia |
| O'Brien | T | | | Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
| O'Brien | T | | | 3rd Battalion
Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
| O'Brien | T | | | 1st Battalion
Source: QSA and KSA medal rolls | Loyal North Lancashire Regiment |
| O'Brien | T | 4670 | Private | QSA (5) Tal DoL OFS Tr LN; KSA (2)
Provisional list of recipients
Source: Ladysmith Siege Account and Medal Roll | (Princess Victoria's) Royal Irish Fusiliers |
| O'Brien | T | 4790 | Private | 2nd Btn. Wounded at Talana. 20 Oct 1899.
Source: Natal Field Force Casualty Roll, page 192 line 7 | Royal Dublin Fusiliers |
| O'Brien | T | | Trooper | Source: Nominal roll in WO127 | Queenstown Rifle Volunteers |
| O'Brien | T | | Trooper | BSACM Rhodesia 1896 (0).
Source: BSACM rolls | Salisbury Field Force |
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