| 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 |
| 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 |
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