| O.J. Erasmus Ngk PrimêRe Skool Kalbaskraal | Kalbaskraal | — | — |
| O.R Tambo Secondary School Germiston | Germiston | — | — |
| O.R. Mabotja Polokwane | Polokwane | — | — |
| Oakdale Landbouskool Riversdale | Riversdale | oakdale.co.za/ | info@oakdale.co.za |
| Oakdale Montessori School City Of Cape Town | City Of Cape Town | — | — |
| Oakdale Montessori Sunningdale City Of Cape Town | City Of Cape Town | — | — |
| Oakdale Secondary School Johannesburg | Johannesburg | — | — |
| Oakdene Primary School Fort Beaufort | Fort Beaufort | — | — |
| Oakford Primary School | | — | — |
| Oakhill School Knysna | Knysna | oakhill.co.za | info@oakhill.co.za |
| Oakhurst Girls' Primary School City Of Cape Town | City Of Cape Town | — | — |
| Oakland Academy City Of Cape Town | City Of Cape Town | oaklandacademyed.co.za/ | — |
| Oaklands SekondêR City Of Cape Town | City Of Cape Town | oaklandshighschool.co.za/contact/ | — |
| Oakley Higher Primary School Bushbuckridge | Bushbuckridge | — | — |
| Oakmeade Prep Academy Meyerton | Meyerton | — | — |
| Oakridge College | | — | — |
| Oakview Academy City Of Cape Town | City Of Cape Town | — | — |
| Oakwood Junior Primary School Queenstown | Queenstown | — | — |
| Oarabile Intermediate School Kuruman | Kuruman | — | — |
| Oasis Comprehensive School | | oasisspecialschool.co.za/ | — |
| Oasis Excellence Academy Kuruman | Kuruman | — | — |
| Oasis Preparatory School | | schoolandcollegelistings.com/ZA/Howick/616462491701450/Oasis-Preparatory-School | — |
| Oatlands Preparatory School Grahamstown | Grahamstown | — | — |
| Obakeng Primary School Radituso | Radituso | — | — |
| Obang Secondary Amalia | Amalia | — | — |
| Obani Primary School | | — | — |
| Obanjeni Primary School | | — | — |
| Obed Mlaba Technical High School | | — | — |
| Obed Mosiane Primary School Roodepoort | Roodepoort | — | — |
| Obisini Primary School | | — | — |
| Obivane Primary School | | — | — |
| Obonjaneni Primary School | | — | — |
| Obontse Primary School Kuruman | Kuruman | — | — |
| Observatory East Primary School Johannesburg | Johannesburg | — | — |
| Observatory Girls' Primary School Johannesburg | Johannesburg | — | — |
| Observatory Junior City Of Cape Town | City Of Cape Town | observatoryjunior.co.za/ | observatory.prim@wcgschools.gov.za |
| Obuka Senior Secondary School | | — | — |
| Obusitse Intermediate School Madibogo | Madibogo | obusitseintermediateschool.co.za/ | — |
| Ocean View House Primary School | | — | — |
| Ocean View Secondary School City Of Cape Town | City Of Cape Town | — | — |
| Oceans Private School Midrand | Midrand | — | — |
| Oceans Private School Randburg | Randburg | — | — |
| Oceans Private School Thohoyandou | Thohoyandou | oceansprivateschool.co.za | — |
| Oceanview Primary School East London | East London | — | — |
| Oceanview Primary School | | — | — |
| Ocheni Primary School | | — | — |
| Ocilwane Primary School | | — | — |
| Odeke Combined Primary School | | — | — |
| Odensia P/S Odendaalsrus | Odendaalsrus | odensia.co.za/ | — |
| Odi Primary School Brits | Brits | — | — |
| Odidini Primary School | | — | — |
| Odinpark Primary School Johannesburg | Johannesburg | — | — |
| Odlameni Primary School | | — | — |
| Odoland Primary School | | — | — |
| Odyssey Academy Johannesburg | Johannesburg | — | — |
| Oebisfelde Intermediate School | | — | — |
| Ofentse Primary School Saulspoort | Saulspoort | — | — |
| Ogade Primary School | | — | — |
| Ogagwini Primary School | | — | — |
| Ogazini Primary School | | — | — |
| Ogedleni Public Primary School | | — | — |
| Ogodiseng Secondary School Morokweng | Morokweng | ogodisengsecondary.northwestschool.co.za/ | — |
| Ogunjini Primary School | | — | — |
| Ogwini Comprehensive Technical High School | | — | — |
| Ohlahla Primary School | | — | — |
| Ohlalwini Primary School | | ohlalwiniprimary.co.za/contact-us/ | — |
| Ohlange High School | | — | — |
| Ohlangeni Primary School | | — | — |
| Ohlelo Primary School | | — | — |
| Oker PrimêRe Skool Albertinia | Albertinia | — | — |
| Oketsang Primary School Taung | Taung | — | — |
| Okhalweni Primary School | | — | — |
| Okhalweni Primary School | | — | — |
| Okhayeni Primary School | | — | — |
| Okhela Primary School Delmas | Delmas | — | — |
| Okhombe Primary School | | — | — |
| Okhozini Senior Primary School | | — | — |
| Okhukho Public Primary School | | — | — |
| Okhulana Primary School | | — | — |
| Okiep HoëR Skool Okiep | Okiep | — | — |
| Okiep Laerskool Okiep | Okiep | — | — |
| Okkie Smuts Primary School Stanford | Stanford | — | — |
| Oklahomastraat PrimêRe Skool City Of Cape Town | City Of Cape Town | — | — |
| Okomelang Primary School Saulspoort | Saulspoort | — | — |
| Okumhlophe Secondary School | | — | — |
| Old Bunting Junior Secondary School Libode | Libode | — | — |
| Old Mill School | | — | — |
| Olebile Primary School Taung | Taung | — | — |
| Olebogeng Intermediate School Kuruman | Kuruman | — | — |
| Olefile Secondary School Madikwe | Madikwe | — | — |
| Olehile Manchwe Intermediate School Pampierstad | Pampierstad | — | — |
| Olien S/S Fauresmith | Fauresmith | — | — |
| Olienpark Laerskool Brits | Brits | — | — |
| Olierivier Marianette PrimêRe Skool Douglas | Douglas | — | — |
| Olievenhoutbosch Primary Centurion | Centurion | — | — |
| Olievenhoutbosch Secondary School Pretoria | Pretoria | — | — |
| Olievenhoutbosch Secondary School 2 Pretoria | Pretoria | — | — |
| Olifantsdrift Lephalale | Lephalale | — | — |
| Olifantsfontein Primary School Midrand | Midrand | — | — |
| Olifantsvallei PrimêRe Skool Citrusdal | Citrusdal | — | — |
| Olifantsvlei Primary Farm School Johannesburg | Johannesburg | — | — |
| Olive Ridge Ip/S Bloemfontein | Bloemfontein | — | — |
| Olive Ridge School East London | East London | olive-ridge-school.co.za/ | — |
| Oliver Lodge Primary School Vanderbijlpark | Vanderbijlpark | — | — |
| Oliver Tambo Technical High School Bizana | Bizana | — | — |
| Olivet Private School Queenstown | Queenstown | — | — |
| Olwambeni Primary School | | — | — |
| Olwandle High School | | — | — |
| Olwasini Junior Primary School | | — | — |
| Olwazini Primary School | | — | — |
| Olyfkrans College. Swellendam | Swellendam | — | — |
| Olympia P/S Bloemfontein | Bloemfontein | — | — |
| Olympia Primary School | | — | — |
| Olympic Primary School Kimberley | Kimberley | — | — |
| Olyvenhoutsdrift PrimêRe Skool Upington | Upington | — | — |
| Omang Primary School Kuruman | Kuruman | — | — |
| Omar H.S.Ebrahim Lotus Gardens Primary School Pretoria | Pretoria | — | — |
| Ombimbini Combined Primary School | | — | — |
| Omega Primary School Mmabatho | Mmabatho | — | — |
| Onalerona Primary Taung | Taung | — | — |
| Onane Groblersdal | Groblersdal | onaneprimaryschool.co.za/ | — |
| Onderstepoort Primary School Pretoria | Pretoria | — | — |
| Ondini High School | | — | — |
| Ondini Primary School | | — | — |
| Ongane Combine School | | — | — |
| Ongedacht Levubu | Levubu | — | — |
| Ongeluk'S Nek Primary School Matatiele | Matatiele | — | — |
| Ongoye Primary School | | — | — |
| Ongoye Secondary School | | — | — |
| Oningeni Primary School | | — | — |
| Onismus Mogafe Groblersdal | Groblersdal | — | — |
| Onkabetse- Thuto Setlagole | Setlagole | onkabetse-thutosecondary.co.za/ | — |
| Onkgopotse Tiro Comprehensive School Slurry | Slurry | — | — |
| Onkgopotse Tiro Primary School Johannesburg | Johannesburg | — | — |
| Ons Anker If/S Hennenman | Hennenman | — | — |
| Ontingweni Primary School | | — | — |
| Ontlametse Phalatse Primary School Pretoria | Pretoria | — | — |
| Onverwacht Primary School Pretoria | Pretoria | — | — |
| Onze Rust P/S Bloemfontein | Bloemfontein | — | — |
| Ooghoek Tzaneen | Tzaneen | — | — |
| Oos-Rand Akademie Kempton Park | Kempton Park | oosrandakademie.co.za/kontak | ontvangs@oosrandakademie.co.za |
| Oostenberg Good Hope Christian School City Of Cape Town | City Of Cape Town | — | — |
| Op Die Voorpos PrimêRe Skool Upington | Upington | opdievoorpos.co.za/ | — |
| Opadiatla Primary School Itsoseng | Itsoseng | — | — |
| Opelweg Primary School Alberton | Alberton | — | — |
| Openside Farm School Cathcart | Cathcart | — | — |
| Ophansi Primary School | | — | — |
| Ophapheni Primary School | | — | — |
| Ophathe Primary School | | — | — |
| Ophofini Secondary School | | — | — |
| Ophondweni Primary School | | — | — |
| Ophongolo High School | | — | — |
| Ophuzane Primary School | | — | — |
| Oppermans I/S Koffiefontein | Koffiefontein | — | — |
| Oppermanskraal Primary School | | — | — |
| Oppieplaas Academy Ltd Bethal | Bethal | — | — |
| Oprah Winfrey Leadership Academy For Girls - South Africa Randvaal | Randvaal | owlag.co.za/contact/ | — |
| Oqaqeni Primary School | | — | — |
| Oqondweni Primary School | | — | — |
| Oqungweni Primary School | | — | — |
| Or Tambo Comprehensive Dennilton | Dennilton | — | — |
| Or Tambo Primary School Kempton Park | Kempton Park | — | — |
| Ora Et Labora Primary School Pretoria | Pretoria | — | — |
| Oracle Senior Secondary School City Of Cape Town | City Of Cape Town | — | — |
| Orange Farm Primary School Johannesburg | Johannesburg | — | — |
| Orange Farm Secondary School Johannesburg | Johannesburg | — | — |
| Orange Grove Junior Secondary School Mthatha | Mthatha | — | — |
| Orange Grove Primary School Johannesburg | Johannesburg | — | — |
| Orange Grove Schools | | — | — |
| Orania Cvo Gekombineerde Skool Orania | Orania | — | — |
| Oranje Diamant PrimêRe Skool Hopetown | Hopetown | — | — |
| Oranje-Oewer IntermediêRe Skool Upington | Upington | — | — |
| Oranje-Suid PrimêRe Skool Kakamas | Kakamas | — | — |
| Oranjekloof Mor Primary School City Of Cape Town | City Of Cape Town | — | — |
| Oranjekrag C/S Gariepdam | Gariepdam | — | — |
| Oranjeville P/S Oranjeville | Oranjeville | — | — |
| Orban School Johannesburg | Johannesburg | orban.co.za | fin@orban.co.za |
| Orchard PrimêRe Skool De Doorns | De Doorns | — | — |
| Orchards Primary School Johannesburg | Johannesburg | — | — |
| Orchards Primary School Pretoria | Pretoria | — | — |
| Orchid Giyani | Giyani | — | — |
| Oreeditse Primary School Heunaar | Heunaar | — | — |
| Orefile Primary School Pretoria | Pretoria | — | — |
| Orel Private Academy Kimberley | Kimberley | — | — |
| Orhovelani Education Centre Boksburg | Boksburg | — | — |
| Orhovelani High School Thulamahashe | Thulamahashe | — | — |
| Oriah Pre And Primary School Vanderbijlpark | Vanderbijlpark | — | — |
| Orient Heights Primary School | | — | — |
| Orient Hill Primary School | | — | — |
| Orient Islamic School | | — | — |
| Orion SekondêRe Skool De Aar | De Aar | — | — |
| Orissa Primary School | | — | — |
| Orlando Sda Primary School Soweto | Soweto | orlandosdaprimary.co.za/ | — |
| Orlando Secondary School Johannesburg | Johannesburg | — | — |
| Orlando West Secondary School Johannesburg | Johannesburg | — | — |
| Orleansvale PrimêRe Skool Paarl | Paarl | — | — |
| Ormonde Primary School Johannesburg | Johannesburg | — | — |
| Ortloff Preparatory Mokopane | Mokopane | ortloffs.co.za/wp-content/uploads/2025/07/Preparatory-Prospectus-2026.pdf | — |
| Osaletseng Primary School Brits | Brits | — | — |
| Osborn Primary School Mount Frere | Mount Frere | — | — |
| Osborn Senior Secondary School Mount Frere | Mount Frere | — | — |
| Oscar Mpetha High School City Of Cape Town | City Of Cape Town | — | — |
| Oscarsberg Primary School | | — | — |
| Oshabeni Primary School | | — | — |
| Osingisingini Primary School | | — | — |
| Osizweni High School | | — | — |
| Osizweni Primary School | | — | — |
| Osizweni Primary School Secunda | Secunda | — | — |
| Osizweni Secondary School Secunda | Secunda | osizweni.org.za/ | — |
| Oskraal Intermediate School Garankuwa | Garankuwa | — | — |
| Osuthu Primary School | | — | — |
| Othaile Primary School Morokweng | Morokweng | — | — |
| Othandweni Junior Primary School | | — | — |
| Othandweni Primary School Delmas | Delmas | — | — |
| Othiyeni Primary School | | — | — |
| Othobothini Primary School | | — | — |
| Othungwini Primary School | | — | — |
| Othweba Primary School | | — | — |
| Otimati Primary School | | — | — |
| Ottawa Primary School | | — | — |
| Otter'S Creek Junior School City Of Cape Town | City Of Cape Town | — | — |
| Ottery Road Primary School City Of Cape Town | City Of Cape Town | — | — |
| Otto Du Plessis Senior Secondary School Gqeberha | Gqeberha | — | — |
| Oude Molen Hts. City Of Cape Town | City Of Cape Town | oudemolen.org.za/ | — |
| Oudtshoorn HoëRskool Oudtshoorn | Oudtshoorn | struisies.co.za/ | info@struisies.co.za |
| Oukasi Primary School Brits | Brits | — | — |
| Ouplaas Ek PrimêRe Skool Witsand | Witsand | — | — |
| Our Father'S Academy Ci/S Bloemfontein | Bloemfontein | ourfathersacademy.com/ | — |
| Our Lady Of Fatima Dominican Convent School | | fatima.co.za/ | clourens@fatima.co.za |
| Our Lady Of Lebanon Maronite Catholic School Alberton | Alberton | maroniteschoolsa.co.za | highschoolsecretary@maronitesa.co.za |
| Our Lady Of The Rosary Secondary School | | — | — |
| Our Lady Of Wisdom Johannesburg | Johannesburg | — | — |
| Our Saviour Primary School Queenstown | Queenstown | — | — |
| Ourlady Primary School | | — | — |
| Outeniqua HoëRskool George | George | outeniqua.co.za/ | info@outeniqua.co.za |
| Outeniqua Primary School George | George | outeniquaprimary.co.za/ | outeniquaprim@gmail.com |
| Outfall Primary School | | — | — |
| Outspan Primary School Matatiele | Matatiele | — | — |
| Oval North Secondary School City Of Cape Town | City Of Cape Town | — | — |
| Overberg High School Caledon/Myddleton | Caledon/Myddleton | hsoverberg.com/ | admin@hsoverberg.com |
| Overberg Laerskool Caledon/Myddleton | Caledon/Myddleton | — | — |
| Overhex Ngk PrimêRe Skool Worcester | Worcester | — | — |
| Overport S.R.S. Primary School | | — | — |
| Overport Secondary School | | — | — |
| Overton Primary School East London | East London | — | — |
| Overtoun Primary School | | — | — |
| Overvaal Private School Klerksdorp | Klerksdorp | — | — |
| Oviceni Primary School | | — | — |
| Oviston Primary School Venterstad | Venterstad | — | — |
| Ovukukaneni Primary School | | — | — |
| Oxford Combined College Kempton Park | Kempton Park | — | — |
| Oxford Independent School | | — | — |
| Oxford International High School | | — | — |
| Oxford Training Centre Johannesburg | Johannesburg | — | — |
| Oxolweni Primary School | | — | — |
| Oyemeni Primary School | | — | — |
| Ozabeni Primary School | | — | — |
| Ozias Davhana Elim | Elim | — | — |
| Oziel Selele Cs/S Bothaville | Bothaville | — | — |
| Ozwathini Primary School | | — | — |
| Ozweleni Pp School | | — | — |
| Ozweni Primary School | | — | — |
