| Ott | C S | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Otto | C | 284 | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Otto | C | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Otto | J H | 502 | Sergeant | QSA known to exist. QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Cape Police |
| Otto | Peter | 373 | Trooper | QSA known to exist. QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Outong | C | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Outram | E H | | | QSA (0)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Overall | G | 4480 | Private | QSA (4)
Source: List of QSAs with the clasp Defence of Kimberley | Loyal North Lancashire Regiment |
| Overberg | P | | Private | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Owen | Arthur Duncan | 172 | Corporal | QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Owen | Hugh | 928 | Private | QSA known to exist. QSA (5)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Owen | L M | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Owen | Lewis Llewellyn | 367 | Sergeant | QSA (4)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Owen | R T | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Owen | Randal Charles | 146 | Gunner | QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Diamond Fields Artillery |
| Owen | Richard Edward | 191 | Trooper | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Owens | W H | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oxford | S | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oxley | E M | | Sister | QSA known to exist. QSA (0)
Source: List of QSAs with the clasp Defence of Kimberley | Nurses |
| Ozard | R | 698 | Sergeant | QSA known to exist. QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
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