| Orwin | G N | | | Received the Mediterranean Medal
5th Battalion
Source: Medal roll WO100 368 | Northumberland Fusiliers |
| Orwin | L | 1549 | Sapper | Invalided.
QSA (1) CC
TNA ref 159/31 | Royal Engineers, Telegraph Battalion, 1st Division |
| Orwin | L F | | Private | Source: Nominal roll in WO127 | SAMIF |
| Orwin | L F | | | Source: QSA and KSA rolls | Imperial Light Infantry |
| Orwin | Leonard Frederick | 915 | Private | Source: Nominal roll in WO127 | Imperial Light Infantry |
| Orwin | S | 5626 | Private | QSA (5).
Source: QSA medal rolls | 7th (The Queen's Own) Hussars |
| Orwin | T H | | Member | | Upper Tugela Rifle Association |
| Oryan | D | | | 2nd Battalion
Source: QSA and KSA medal rolls | Gloucestershire Regiment |
| Oryan | P | | | 2nd Battalion
Source: QSA and KSA medal rolls | Hampshire Regiment |
| Osaki | | | Cornelius | Source: QSA Medal Rolls | Imperial Yeomanry Hospital |
| Osbahn | Hans Heinrich | | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Osbahr | Hans Heinrich | | | Prisoner number: 16130
Captured: Barberton 14 Nov 1900
Sent to: Unknown
Age: 28
Address: Liebeck
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Osbalderton | R | | | 2nd Battalion, 3rd Volunteer Service Company
Source: QSA and KSA medal rolls | Lancashire Fusiliers |
| Osbaldeston | R | 9771 | Private | 3rd Volunteer Company, 2nd Battalion
Source: QSA roll | Lancashire Fusiliers |
| Osbaldeston | W | | | 2nd Battalion
Source: QSA and KSA medal rolls | King's Royal Rifle Corps |
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