| Mountain | State | Latitude | Longitude | Elevation (meters) | Elevation (feet) |
|---|
| Jinginja | Province of Eastern Cape | -31.6333333 | 27.2833333 | 1643 | 5390 |
| Jobskop | Limpopo Province | -24.2166667 | 29.9833333 | 716 | 2349 |
| Jobskop | Province of KwaZulu-Natal | -28.5666667 | 30.2 | 1400 | 4593 |
| Jokweni | Province of KwaZulu-Natal | -28.7166667 | 30.9166667 | 1139 | 3737 |
| Jonkersberg | Province of the Western Cape | -33.9333333 | 23.1 | 765 | 2510 |
| Josef se Kop | Province of Northern Cape | -30.45 | 18.2 | 962 | 3156 |
| Josefkop | Province of Northern Cape | -28.8333333 | 17.2333333 | 713 | 2339 |
| Josefskop | Mpumalanga | -25.95 | 31.1 | 1543 | 5062 |
| Joubertberg | Province of North-West | -25.6 | 26.35 | 1209 | 3967 |
| Joubertskop | Province of Eastern Cape | -30.8333333 | 26.5833333 | 1596 | 5236 |
| Joubertspiek | Province of the Western Cape | -33.9 | 18.9333333 | 601 | 1972 |
| Juanasberg | Province of Eastern Cape | -32.65 | 26.7666667 | 1201 | 3940 |
| Jubilee | Mpumalanga | -24.9166667 | 30.7833333 | 1753 | 5751 |
| Judas Peak | Province of the Western Cape | -34.2833333 | 18.4666667 | | |
| Junction Peak | Province of the Western Cape | -33.9666667 | 18.4166667 | 1036 | 3399 |
| Kaalberg | Province of Northern Cape | -30.5166667 | 18.1833333 | 644 | 2113 |
| Kaalkop | Free State | -27.5833333 | 29.05 | 1869 | 6132 |
| Kaalrug | Mpumalanga | -25.6 | 31.55 | 515 | 1690 |
| Kabinaberg | Province of Northern Cape | -29.1833333 | 17.8 | 1039 | 3409 |
| Kabiskop | Province of Northern Cape | -28.9666667 | 18.4833333 | 550 | 1804 |
