- Foreign Economic Relations Board (DEİK)
- Business Council for Sustainable Development (BCSD Türkiye)
- UN Global Compact Türkiye (Association of Global Compact Signatories)
- United Nations Global Compact (UNGC)
- Turkish Industry and Business Association (TUSIAD)
- Board Directors Association (YUD)
- Istanbul Chamber of Commerce (ITO)
- Corporate Communicators Association (KID)
- Istanbul Bar Association
- Union of Chambers and Commodity Exchanges of Türkiye
- Turkish Investor Relations Society (TUYID)
- Service Exporters’ Association
- Ethics and Reputation Society (TEID)
- Istanbul Chamber of Certified Public Accountants (ISMMMO)
- Turkish Wind Energy Association (TWEA)
- International Pipeline Offshore Contractors Association (IPLOCA)
- Petroleum and Natural Gas Platform Association
- Adana Chamber of Industry
- Adana Chamber of Commerce
- Adana Chamber of Public Accountants
- Ceyhan Chamber of Commerce
- Chamber of Shipping (IMEAK)
- Chamber of Electrical Engineers
- International Fertilizer Association (IFA)
- Mersin Chamber of Commerce and Industry
- Turkish Chemical, Petroleum, Rubber and Plastics Industry Employers’ Association (KİPLAS)
- Port Operators Association of Türkiye (TURKLIM)
- Istanbul Chamber of Industry (ISO)
- Samsun Chamber of Commerce and Industry
- Uludağ Exporters’ Association
- Aegean Exporters’ Association
- Mediterranean Exporters’ Association
- Alaşehir Chamber of Commerce
- Malatya Chamber of Commerce
- Salihli Chamber of Commerce
- Maritime Association of Shipowners and Agents
In 2024, Tekfen Holding and its Group Companies paid TRY 6,121,688 in membership fees to partnered professional and nongovernmental organizations.