- Oil Seeds Advisory Committee (OAC)
- Onderspoort Veterinary Institute (OVI)
- Open Society Foundation for South Africa (OSFSA)
- Operation Hunger (OH)
- Operations Research Society of South Africa (ORRSA)
- Opthalmological Society of South Africa (OSSA)
- OR Tambo International Airport Special Economic Zone (OR TAMBO SEZ)
- Oral Hygienists Association of South Africa (OHASA)
- Order of St John South Africa (OSJ-SA)
- Orff Schulwerk Society of South Africa (OSSSA)
- Organ Donor Foundation of Southern Africa (ODF)
- Organisation of Civic Rights (OCR)
- Organisation of South African Law Libraries (OSALL)
- Orientation and Mobility Association of South Africa (OMASA)
- Oudtshoorn Business Chamber (OBC)
- OUT well-being (OUT)
- Outdoor Power Product Association of South Africa (OPPASA)
- Outeniqua Canoe Club (OCC)
- Overberg Crane Group (OCG)
- Packaging Council of South Africa (PACSA)
- Paediatric Cardiac Society of South Africa (PCSSA)
- Paediatric Cardiology Society of South Africa (PCSSA)
- Pain South Africa (PSA)
- Palaeontological Society of Southern Africa (PSSA)
- Pan African Society for Agricultural Engineering (PASAE)
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