| | Name | Given Name | Initials | Regiment | Unit | Cemetery | Country | Locality | Date of Death |
 |  | OLIVIER | CRAIG RUDOLPH | C R | South African Infantry Corps | Durban Light Infantry | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1984-05-25 |
| | | OLIVIER | OEL | O | South African Army | | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1950-01-01 |
| | | OLYN | DON STOFFEL | D S | South West African Territory Force | 911 Battalion | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1982-05-11 |
| |  | OLYOTT | GREGORY GEORGE | G G | South African Infantry Corps | 5 South African Infantry Battalion | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1970-09-13 |
| | | OOSTHUIS | COLIN GEORGE CLEMENT | C G C | South African Navy | SAS SIMONSTOWN | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1985-09-13 |
| | | OOSTHUIZEN | DANIEL PIETER | D P | South African Infantry Corps | 4 South African Infantry Battalion | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1983-11-06 |
| | | OOSTHUIZEN | ESAU | E | South African Ordnance Services Corps | 5 Maintenance Unit | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1987-04-30 |
| | | OOSTHUIZEN | HENRY CECIL | H C | South African Air Force | Air Force Gymnasium | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1965-09-05 |
| | | OOSTHUIZEN | QUINTON CLIVE | Q C | South West African Territory Force | 203 Battalion | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1983-10-01 |
| | | OPPERMAN | FREDERIK JACOBUS | F J | South African Commandos | Hartebeesfontein Commando | SADF WALL OF REMEMBRANCE, VOORTREKKER MONUMENT, PRETORIA | South Africa | Gauteng | 1992-10-24 |