| Opitz | T | | Private | Frontier Wars. SAGS (1) 1878. Medal returned | Stutterheim Mounted Police |
| Oply | Lucas Johannes | | | Prisoner number: 24034
Captured: Platkop 28 Sep 1901
Sent to: India
Age: 18
Address: Wolvenspruit
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Oppe | Albert Sanvil | 4229 | Trooper | MG Section, 11th Btn IY
Source: QSA Medal Rolls | Imperial Yeomanry |
| Oppel | Bernhard Wilhelm | | | Prisoner number: 9971
Captured: Fouriesburg 30 Jul 1900
Sent to: Ceylon, Diyatalawa
Age: 20
Address: Noordwege
Source: Anglo Boer War Museum 2016 | Boer Forces |
| Oppel | C | | Trooper | Frontier Wars. SAGS (1) 1879. Medal returned | Transvaal Rangers |
| Oppel | Frederick | 17 | Trooper | Source: Nominal roll in WO127 | Namaqualand Border Scouts |
| Oppel | H | | | Source: QSA and KSA rolls | DEOVR |
| Oppel | H | 3325 | Trooper | Died of disease. Bloemfontein, 12 April 1900
Source: South African Field Force Casualty Roll | Kitchener's Horse |
| Oppel | H A | | Trooper | Frontier Wars. SAGS (1) 1878 | One Star Diamond Contingent |
| Oppel | Hendrik A | | | Volunteer from Germany serving with the Boer forces
Source: Anglo Boer War Museum database, August 2016 | German volunteers |
| Oppel | Henry Michael | 3325 | Trooper | Source: Nominal roll in WO127 | Kitchener's Horse |
| Oppel | M | 2341 | Conductor | Weil's Transport. Medal returned or issued elsewhere
Source: QSA and KSA medal rolls | Imperial Transport Service |
| Oppel | N | 93 | Trooper | Source: Nominal roll in WO127 | Clanwilliam Convoy Guard |
| Oppel | W | | | Source: WO100/280 | Clanwilliam Convoy Guard |
| Oppel | William | 410 | Trooper | Source: Nominal roll in WO127 | Bushmanland Borderers |
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