| Oosthuizen | John | 142 | Private | QSA (5)
Source: List of QSAs with the clasp Defence of Kimberley | Cape Police |
| Orborne | A | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Orchard | A | 2866 | L Corporal | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Loyal North Lancashire Regiment |
| Orchard | Horace Lancelot | 224 | Corporal | QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Orpen | Charles | 399 | Private | QSA (4)
Source: List of QSAs with the clasp Defence of Kimberley | Cape Police |
| Orr | J | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Orr | John | | Lieutenant | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Orr | John | 244 | Corporal | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Orr | T H | 132 | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Orrell | W | 3848 | Private | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Loyal North Lancashire Regiment |
| Orren | F E | 388 | Private | QSA (4)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Ortell | J | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Ortlepp | Albert James | | Surg Lieutenant | QSA (5)
Source: List of QSAs with the clasp Defence of Kimberley | Diamond Fields Artillery |
| Ortlepp | J | 281 | Private | QSA (5)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Osborne | Alfred | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Osborne | C | | Lieutenant | QSA known to exist. QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Osborne | Joseph Peter | 166 | Sergeant | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Diamond Fields Artillery |
| Osman | F | | Mr | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Army Post Office Corps |
| Osner | W | | Corporal | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Osselair | F | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
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