- Conference of Speakers of the European Union Parliaments
- Extraordinary meeting of Speakers of EU Parliaments
- Conference of Parliamentary Committees for Union Affairs of Parliaments of the European Union (COSAC)
- Cooperation of national parliaments with the European Parliament
- Inter-Parliamentary Conference for the Common Foreign and Security Policy and the Common Security and Defence Policy (IPC CFSP/CSDP)
- Interparliamentary Conference on Stability, Economic Coordination and Governance in the European Union (previously Interparliamentary Conference on Economic and Financial Governance of the EU)
- Joint Parliamentary Scrutiny Group on Europol (JPSG)
- Visegrád Group
- Meetings of the of the Committees on European Affairs of the Parliaments of Estonia, Latvia, Lithuania and Poland
- Weimar Triangle
- The Parliamentary Assembly – Union for the Mediterranean (PA-UfM) / Euro-Mediterranean Parliamentary Assembly (EMPA)
Inter-parliamentary Conference on the Future of the European Union, 1-2.04.2019
Interinstitutional Conference with National Parliaments on the Future Financing of the European Union, 7-8.09.2016
Cooperation terminated
