- Institute of Packaging South Africa (IPSA)
- Institute of People Management (IPM)
- Institute of Plumbing South Africa (IOPSA)
- Institute of Professional Engineering Technologists (IPET)
- Institute of Quarrying Southern Africa (IQSA)
- Institute of Retirement Funds Africa (IRFA)
- Institute of Risk Management South Africa (IRMSA)
- Institute of South African Municipal Accounting Officers (ISAMAO)
- Institute of Waste Management of Southern Africa (IWMSA)
- Institution of Certificated Mechanical & Electrical (ICMEES)
- Institution of Certificated Mechanical and Electrical Engineers, South Africa (ICMEES)
- Institution of Fire Engineers South Africa (IFE)
- Institution of Fire Engineers South African Branch (IFE)
- Insurance and Banking Staff Association (IBSA)
- Insurance Institute of Gauteng (IIG)
- Insurance Institute of KwaZulu-Natal (IIKZN)
- Insurance Institute of South Africa (IISA)
- Insurance Institute of The Eastern Cape (IIEC)
- Insurance Institute of the Western Cape (IIWC)
- Insurance Sector Education and Training Authority (INSETA)
- Inter Trauma Nexus (ITN)
- Interactive Reality Foundation (IRF)
- Interchange Foundation (IF)
- International Academy of Pathology, South African Division (IAPSA)
- International Association for Impact Assessment South Africa (IAIASA)
