O
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- Occupational Therapy Association of South Africa (OTASA) // translators: shows the title
- Ocean Sailing Association of Southern Africa (OSASA) // translators: shows the title
- Oceanographic Research Institute (ORI) // translators: shows the title
- Ocularists Association of Southern Africa (OASA) // translators: shows the title
- Office of Health Standards Compliance (OHSC) // translators: shows the title
- Office of the Health Ombud (OHO) // translators: shows the title
- Office of the Ombud for Financial Service Providers (FAISOmbud) // translators: shows the title
- Office Professionals of South Africa (OPSA) // translators: shows the title
- Oil and Protein Seeds Development Trust (OPDT) // translators: shows the title
- Oil Seeds Advisory Committee (OAC) // translators: shows the title
- Onderspoort Veterinary Institute (OVI) // translators: shows the title
- Open Society Foundation for South Africa (OSFSA) // translators: shows the title
- Operation Hunger (OH) // translators: shows the title
- Operations Research Society of South Africa (ORRSA) // translators: shows the title
- Opthalmological Society of South Africa (OSSA) // translators: shows the title
- OR Tambo International Airport Special Economic Zone (OR TAMBO SEZ) // translators: shows the title
- Oral Hygienists Association of South Africa (OHASA) // translators: shows the title
- Orchid Society of Northern Transvaal () // translators: shows the title
- Order of St John South Africa (OSJ-SA) // translators: shows the title
- Orff Schulwerk Society of South Africa (OSSSA) // translators: shows the title
- Organ Donor Foundation of Southern Africa (ODF) // translators: shows the title
- Organisation of Civic Rights (OCR) // translators: shows the title
- Organisation of South African Law Libraries (OSALL) // translators: shows the title
- Orientation and Mobility Association of South Africa (OMASA) // translators: shows the title
- Oudtshoorn Business Chamber (OBC) // translators: shows the title
- OUT well-being (OUT) // translators: shows the title
- Outdoor Power Product Association of South Africa (OPPASA) // translators: shows the title
- Outeniqua Canoe Club (OCC) // translators: shows the title
- Overberg Crane Group (OCG)
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