- Canada Research Chair in Quebec and Canadian Studies/ Le Centre de recherche interdisciplinaire sur la diversité (CRIDAQ)
- Center for State Constitutional Studies, Rutgers University
- Centre for Comparative Constitutional Studies
- Centre for Federal Studies
- Centre for Federal Studies (CFS)
- Centre for Multilevel Federalism
- Centre International de Formation Européenne (CIFE)
- Centre on Governance, University of Ottawa
- Centro de Estudios Políticos y Constitucionales
- Committee of the Regions
- Community Law Centre, University of the Western Cape
- Comparative Federalism and Federation Research Committee of the International Political Science Association (IPSA)
- Council of Europe
- Deutsches Institut für Föderalismusforschung e. V. (DIF e.V.)
- Europäisches Zentrum für Föderalismusforschung (EZFF)
- Euroregionale Vereinigung für vergleichendes öffentliches Recht und Europarecht
- Federal Governance - a graduate journal
- German Research Institute for Public Administration (GRIP)
- Institut de Ciencies Politiques I Socials (ICPS)
- Institut d’Estudis Autonòmics (IEA)
- Institut für Föderalismus
- Institut für Föderalismus/Institut du Federalisme
- Institut für Föderalismus- und Regionalismusforschung, Europaische Akademie Bozen (EURAC)
- Institute for Federalism and Intergovernmental Relations (IFIR)
- Institute for Public Economics
- Institute for Studies on Federalism and Regionalism
- Institute of Federalism of the National Academy of Law and Social Sciences of Cordoba
- Institute of Federalism
- Institute of Federalism and Legal Studies Ethiopian Civil Service University
- Institute of Intergovernmental Relations
- Instituto de Derecho Público Comparado
- Instituto Federal de Gobierno Universidad Católica de Córdoba
- Instituto Nacional para el Federalismo y el Desarrollo Municipal (INAFED)
- International Association of Centers for Federal Studies
- Istituto di Studi sui Sistemi Regionali Federali
- International Association of Constitutional Law/ Association Internationale de Droit Constitutionnel (IACL-AIDC)
- International Winter School on Federalism and Governance
- Italian Papers on Federalism
- National Institute of Public Finance and Policy (NIPFP)
- Rechtsinformationssystem des Bundes
- Republik Österreich, Parlament