| Mountain | State | Latitude | Longitude | Elevation (meters) | Elevation (feet) |
|---|
| Osungulweni | Province of KwaZulu-Natal | -28.8666667 | 31.1833333 | 807 | 2648 |
| Othini | Province of KwaZulu-Natal | -28.1166667 | 31.3833333 | 653 | 2142 |
| Otinsangu | Province of KwaZulu-Natal | -28.0666667 | 31.7166667 | 541 | 1775 |
| Otto's Bluff | Province of KwaZulu-Natal | -29.5166667 | 30.3666667 | 961 | 3153 |
| Ouberg | Province of Eastern Cape | -33.7833333 | 25.0166667 | 431 | 1414 |
| Ouberg | Province of Eastern Cape | -32.1 | 24.4333333 | 1589 | 5213 |
| Ouberg | Province of the Western Cape | -32.1666667 | 22.5833333 | 1697 | 5568 |
| Ouboskop | Province of Eastern Cape | -33.8666667 | 24.15 | 815 | 2674 |
| Ouhangsberge | Province of the Western Cape | -33.8666667 | 19.5 | 575 | 1886 |
| Oukloofberg | Province of the Western Cape | -33.2333333 | 19.0666667 | 392 | 1286 |
| Oukop | Province of Northern Cape | -32.0666667 | 20.7666667 | 1475 | 4839 |
| Ou-Nekskop | Province of Eastern Cape | -32.8166667 | 25.2833333 | 738 | 2421 |
| Ouposberg | Province of the Western Cape | -33.55 | 23.2833333 | 1120 | 3675 |
| Outer Mnweni Needle | Province of KwaZulu-Natal | -28.8666667 | 29.05 | 2037 | 6683 |
| Ou-Tierberg | Province of the Western Cape | -33.35 | 20.2333333 | 1076 | 3530 |
| Ouwerf se Kop | Province of Northern Cape | -30.2833333 | 17.8666667 | 717 | 2352 |
| Oxo Kop | Mpumalanga | -25.5666667 | 31.3 | 415 | 1362 |
| Ozwatini | Province of KwaZulu-Natal | -29.4166667 | 30.8666667 | 938 | 3077 |
| Paalhuisberg | Province of the Western Cape | -32.2833333 | 22.0166667 | 1213 | 3980 |
| Paarlberg | Province of the Western Cape | -33.75 | 18.9333333 | 507 | 1663 |
