Business at OECD (BIAC) and the Trade Union Advisory Committee (TUAC) to the OECD formally contribute to the Organisation’s daily work in all areas, representing business and trade union views, respectively.

The OECD regularly consults these trade groups within the framework of the Liaison Committee with International Non-Governmental Organisations of the OECD (chaired by the Secretary-General and open to all member countries) and of the OECD MCM (Meeting of the Council at Ministerial Level) Bureau, ahead of the MCM itself to which these institutional stakeholders have participated directly since 2010.

Youthwise, the OECD’s Youth Advisory Board, was launched in 2021 to bring youth perspectives and ideas to the OECD and to improve youth understanding of the Organisation’s work and international policy making.  

Members are selected to bring a diverse range of professional backgrounds and interests to the table, including in fields such as artificial intelligence, education, environment, technology, gender equality, health and social care, law, politics, climate, natural sciences, social mobility and beyond. They contribute regularly to OECD Ministerial Meetings, participate in OECD high-level events and engage in consultations. 

Over more than 20 years, the European Environmental Bureau's role has evolved from co-ordinating NGO delegations and input for the 1996 Meeting of the Environment Policy Committee at Ministerial Level to one of regular involvement as a key stakeholder in committees and forums. Its network spans the OECD membership and ensures the voice of environmental NGOs is heard. In 2017, their role was formalised through an annual Memorandum of Understanding (MOU) with the OECD.

The International Council on Animal Protection in OECD Programmes gained official status as "invited experts" on certain OECD programmes in 2002. Notably, they had a formal voice in the Working Group of National Co-ordinators of the Test Guidelines Programme (WNT) and the former Task Force on Existing Chemicals, before participating in the Chemicals Committee as of 2012. It has allowed the OECD's testing-related activities to move from animal-based methods to alternatives replacing, reducing and refining animal use (the "Three Rs") in the interest of animal protection, public health and sound science.

OECD Watch, which serves as the official voice of civil society on the OECD Guidelines for Multinational Enterprises, was established in the Netherlands in March 2003. A formal relationship with the OECD Investment Committee centres on improving the implementation of the Guidelines as a corporate accountability tool and strengthening the National Contact Point complaint mechanism. OECD Watch has had a formal relationship with the Working Party on Responsible Business Conduct since its creation in 2013.

In 2008, the establishment of the Civil Society Information Society Advisory Council followed two decades of participation by the Public Voice coalition at the OECD. It enables the participation of civil society in decisions on the digital economy and Internet policy, promoting evidence-based recommendations and policy frameworks.

The DAC-CSO Reference Group facilitates and co-ordinates engagement with the OECD’s Development Assistance Committee (DAC) by CSOs from both the Global North and the Global South, to carry CSO positions in these spaces with the goal of promoting more effective aid and development finance.

The OECD Water Governance Initiative (WGI) is an international multi-stakeholder network of 100+ members from the public, private and non-profit sectors gathering twice a year in a policy forum to share experience on reforms, projects, lessons and good practices in support of better water governance. It co-produced the OECD Principles on Water Governance in 2015, endorsed by over 170 stakeholder groups gathered within a Coalition for Good Water Governance. Since then, WGI members have created tools to further the implementation of the Principles, including the Water Governance Indicator Framework and a set of evolving practices, a Guide on How to Assess Water Governance, and Handbook of What Works for the local implementation of the OECD Principles on Water Governance.