The Committee of the Regions (CoR) is recognized by the EU Institutions as the representative voice of regional and local authorities in EU policy development and EU legislation.
The EU Treaties oblige the Commission, Parliament and Council to consult the Committee of the Regions whenever new proposals are made in areas that affect the regional or local level.
Therefore the Committee of the Regions closely cooperates on a daily basis not only with the EU Institutions but also with many other stakeholders representing the regional and local level, as well as civil society.
European Commission

The Committee of the Regions, the voice of regions and cities in Europe, is closely monitoring the work of the European Commission.
European Parliament

The European Parliament is the only supranational institution whose members are democratically elected by direct universal suffrage. It represents the citizens of the EU Member States. The European Parliament is firmly established as a co-legislator, has budgetary powers and exercises democratic controls over all the European institutions.
The Committee of the Regions works in close relationship with the European Parliament on common issues of concerns for the EU citizens of the Regions and Cities of Europe.
The NAT Commission closely cooperates with the MEPs in the following Parliamentary Committees:
Council of the European Union

The
Council of the European Union is, together with the European Parliament, the decision making body of the European Union.
To voice the concerns of the Regions and Cities of Europe in the field of Economic and Social issues, the NAT Commission closely follows the work of the 28 Member States Ministers in the following areas:
Other EU bodies, agencies and organisations
In addition to the EU Institutions, the EU has a number of other bodies that play specialised roles. Their scientific and technical know-how is valuable to the work of the Committee of the Regions.
European Economic and Social Committee
International organisations and associations