| O'Brien | P | 3799 | Private | 2nd Battalion
Source: QSA roll | (Duke of Cambridge's Own) Middlesex Regiment |
| O'Brien | P | 4941 | Private | 2nd Battalion
Demise: Died 16 Sep 1902
Place: Newcastle?
Source: In Memoriam by S Watt | Prince of Wales's Leinster Regiment (Royal Canadia |
| O'Brien | P | 4941 | Private | 2nd Battalion
Demise: Died 16 Sep 1902
Place: Newcastle?
Source: In Memoriam by S Watt | Prince of Wales's Leinster Regiment (Royal Canadia |
| O'Brien | P | | | Source: QSA and KSA rolls | British South Africa Police |
| O'Brien | P | | | Source: QSA and KSA medal rolls | Cape Town Highlanders |
| O'Brien | P | | Lieutenant | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Cape Police |
| O'Brien | P | | | 3rd Battalion
Source: QSA and KSA medal rolls | Durham Light Infantry |
| O'Brien | P | 2026 | Private | Frontier Wars. SAGS (1) 1879. Medal returned. Forfeited | Connaught Rangers |
| O'Brien | P | | | 1st Battalion
Source: QSA and KSA medal rolls | Durham Light Infantry |
| O'Brien | P | 374 | Private | Frontier Wars. SAGS (1) 1877-8-9. Discharged with Ignominy | Connaught Rangers |
| O'Brien | P | | Corporal | Frontier Wars. SAGS (1) 1877-8. Medal returned. No 1 Company | Port Elizabeth Militia |
| O'Brien | P | 1454 | Corporal | Frontier Wars. SAGS (1) 1878-9 | (Prince Albert's) Somerset Light Infantry |
| O'Brien | P | 50B/1793 | Private | Frontier Wars. SAGS (1) 1879 | (Duke of Cambridge's Own) Middlesex Regiment |
| O'Brien | P | 1752 | Private | Frontier Wars. SAGS (1) 1879 | (Cameronians) Scottish Rifles |
| O'Brien | P | 65B/1813 | Private | Frontier Wars. SAGS (1) 1879 | Connaught Rangers |
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