| O'Brien | P | | Lieutenant | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Cape Police |
| O'Brien | T | | Private | CGHGSM (1) Basutoland
Source: Roll of the CGHGSM | Cape Town Rifles |
| O'Brien | W | | Trooper | CGHGSM (1) Transkei
Source: Roll of the CGHGSM | Bedford Burghers |
| O'Connor | E | | Corporal | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Cape Mounted Riflemen |
| O'Connor | J | | Private | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Cape Police |
| O'Connor | J M | | Private | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Diamond Fields Horse |
| O'Connor | P | | Private | CGHGSM (2) Basutoland Transkei
Source: Roll of the CGHGSM | Willoughbys Horse |
| O'Connor | P R | | Private | CGHGSM (1) Basutoland
Source: Roll of the CGHGSM | DEOVR |
| O'Dell | D | | Private | CGHGSM (1) Bechuanaland. CPD2
Source: Roll of the CGHGSM | Cape Police |
| O'Donoghue | J | | Captain/Adj | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Vryburg Volunteers |
| O'Dowd | M | | Private | CGHGSM (1) Bechuanaland. CPD2
Source: Roll of the CGHGSM | Cape Police |
| O'Grady | B H | | L/Corporal | CGHGSM (1) Basutoland
Source: Roll of the CGHGSM | Prince Alfred's Volunteer Guard |
| O'Grady | P | | Corporal | CGHGSM (1) Basutoland
Source: Roll of the CGHGSM | Stantons Light Horse |
| O'Grady | W | | Private | CGHGSM (1) Transkei
Source: Roll of the CGHGSM | Oudtshoorn Burghers |
| O'Hara | F G | | L/Corporal | CGHGSM (2) Basutoland Transkei
Source: Roll of the CGHGSM | Prince Alfred's Volunteer Guard |
| O'Keefe | D | | FarrSergeant | CGHGSM (2) Basutoland Transkei
Source: Roll of the CGHGSM | Baker's Horse |
| O'Leary | B | | Private | CGHGSM (1) Transkei
Source: Roll of the CGHGSM | Umtata Volunteers |
| O'Leary | D | | Private | CGHGSM (2) Basutoland Transkei
Source: Roll of the CGHGSM | Bullers Mounted |
| O'Leary | S | | Private | CGHGSM (1) Basutoland
Source: Roll of the CGHGSM | DEOVR |
| O'Neill | R | | Private | CGHGSM (1) Bechuanaland
Source: Roll of the CGHGSM | Cape Town Highlanders |
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