S
- South African Institute for Drug Free Sport (SAIDFS)
- South African Institute for Engineering and Environmental Geologists (SAIEG)
- South African Institute for Non-destructive Testing (SPBNDT)
- South African Institute of Refrigeration and Air-Conditioning (SAIRAC)
- South African Institute of Agricultural Engineers (SAIAE)
- South African Institute of Architects – Eastern Cape (SAIAEC)
- South African Institute of Architects – KwaZulu-Natal (SAIA KwaZulu-Natal)
- South African Institute of Architects – Mpumalanga (SAIAMPU)
- South African Institute of Architects (SAIA)
- South African Institute of Auctioneers (SAIA)
- South African Institute of Black Property Practitioners (SAIBPP)
- South African Institute of Building Design (SAIBD)
- South African Institute of Chartered Accountants (SAICA)
- South African Institute of Computer Scientists and Information Technologists (SAICSIT)
- South African Institute of Draughting NPC (SAID)
- South African Institute of Electrical Engineers (SAIEE)
- South African Institute of Environmental Health (SAIEH)
- South African Institute of Financial Markets (SAIFM)
- South African Institute of Foundrymen (SAIF)
- South African Institute of Intellectual Property Law (SAIIPL)
- South African Institute of International Affairs (SAIIA)
- South African Institute of Management (SAIM)
- South African Institute of Marine Engineers and Naval Architects (SAIMENA)
- South African Institute of Materials Handling (SAIMH)
- South African Institute of Mechanical Engineering (SAMechE)
- South African Institute of Medico-Legal Experts (SAIME)
- South African Institute of Occupational Safety and Health (SAIOSH)
- South African Institute of Printing (SAIP)
- South African Institute of Race Relations (SAIRR)
- South African Institute of Stockbrokers (SAIS)
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