| Oats | Francis | | Lieutenant | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oats | J | | Private | QSA known to exist. QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Odendaal | D C | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oehley | John McGregor | 56 | Trooper | QSA known to exist. QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Light Horse |
| Ogilvie | E A | | Nurse | QSA (0)
Source: List of QSAs with the clasp Defence of Kimberley | Nurses |
| Oglethorpe | J | 3708 | Private | QSA known to exist. QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Loyal North Lancashire Regiment |
| Okes | Henry Thomas | 130 | Private | QSA (3)
Source: List of QSAs with the clasp Defence of Kimberley | Cape Police |
| Olds | H F | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Olds | J | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oliphant | T | 85 | Sergeant | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Olive | W A | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oliver | H A | | Captain | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oliver | R | 582 | Private | QSA (4)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley Volunteer Regiment |
| Olivier | C | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Olsen | J | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Olver | H | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Olver | R | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Olver | W J | 2062 | Sapper | QSA (2)
Source: List of QSAs with the clasp Defence of Kimberley | Royal Engineers |
| Oostermeyer | H G | | | QSA (0)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
| Oostermeyer | J J | | Private | QSA (1)
Source: List of QSAs with the clasp Defence of Kimberley | Kimberley TG |
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