| Oliver | Peter E | 6161 | Trooper | QSA (4) CC Wep Witt Belf
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Oliver | William John | 897 | Private | QSA (5) CC Wep Tr Witt SA01
Source: Wepener Siege Account and Medal Roll | Kaffrarian Rifles |
| Ollis | Arthur | 1977 | Corporal | QSA (2) CC Wep. BSACM reverse Matabeleland 1893 (1st Cl Pte CMR); QSA (2); KSA (2). DNW December 2013 £1,150
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| Olsen | F | 681 | Trooper | QSA (4) CC Wep Witt Belf
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Openshaw | F | 1063 | Private | QSA (2) CC Wep
Source: Wepener Siege Account and Medal Roll | Kaffrarian Rifles |
| Oppenheim | Albert Edward | 964 | Trooper | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Orbell | Samuel John | 1529 | Sergeant | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| Orton | Cecil Alfred | 2932 | Lieutenant | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Royal Garrison Artillery |
| Osborn | J A | 1097 | Corporal | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Kaffrarian Rifles |
| Osborn | James | 3158 | Private | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| Osborne | Alfred Avery | 910 | Trooper | QSA (2) CC Wep
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Ovens | George Inglis | 829 | Trooper | QSA (4) CC Wep Witt Belf
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Oxenham | Charles Octavius | 5062 | Lance Corporal | QSA (4) CC Wep Witt Belf
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| Oxley | Joseph Henry | 3284 | Private | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| O’Brien | Daniel George | 3260 | Private | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| O’Brien | Lawrence Patrick | 1145 | Trooper | QSA (4) CC Wep Tr Witt. QSA (4); KSA (2) (Tpr SAMIF); Permanent Forces LS&GC GV (Rfn SAMR). Liverpool Medals January 2009 £675
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
| O’Carroll | J McCarthy | 2778 | Private | QSA (4) CC Wep Tr Witt. QSA (4); KSA (2). Glendining June 1987. City Coins May 2002. City Coins June 2012
Source: Wepener Siege Account and Medal Roll | Cape Mounted Rifles |
| O’Connor | Frederick Henry Pomeroy | | Lieutenant | QSA (4) CC Wep Tr Witt
Source: Wepener Siege Account and Medal Roll | Royal Garrison Artillery |
| O’Connor | John Martin | 699 | Private | QSA (5) CC Wep Tr Witt SA01
Source: Wepener Siege Account and Medal Roll | Kaffrarian Rifles |
| O’Donoghue | D P | | Trooper | QSA (3) CC Wep Witt
Source: Wepener Siege Account and Medal Roll | Brabant's Horse |
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