| | Land | Stadt | Gegründet im Jahr |
|---|
| 2020health | United Kingdom | London | |
| Academy for the Development of a Democratic Environment (AZAD) | Malta | Valletta | 1976 |
| Academy of Liberalism | Estonia | Tallin | 2006 |
| Accion Emprendedora | Chile | Santiago de Chile | |
| Acton Institute | USA | Grand Rapids / Michigan | 1990 |
| Adam Smith Center | Poland | Warsaw | 1989 |
| Adam Smith Institute | UK | London | 1977 |
| Adam Smith Society | Italy | Mailand | |
| Adelphi Research | Germany | Berlin | 2001 |
| Adelphi consult | Germany | Berlin | 2002 |
| Adriatic Institute for Public Policy | Croatia | Rijeka | 2004 |
| AfroBarometer | International | | 1999 |
| Agenda Austria | Austria | Wien | 2013 |
| Aktionsgemeinschaft Soziale Marktwirtschaft | Germany | Tübingen | 1953 |
| Alaska Center for Public Policy | USA | Anchorage | 2004 |
| Albanian Liberal Institute | Albania | Tirana | |
| Alexander Langer Foundation | Italy | Bozen | 1999 |
| Allianz für den Rechtsstaat | Germany | Berlin | 1996 |
| Alois Mock Institut | Austria | St. Pölten | 2012 |
| Alternative Foundation | Spain | Barcelona | 2003 |
| American Economic Association | | | |
| American Enterprise Institute for Public Policy Research | USA | Washington, D.C. | 1938 |
| Americans for Tax Reform | | | |
| Amicus Europae Foundation | Poland | Warsaw | 2004 |
| Analytical Centre on Globalization and Regional Cooperation (ACGRC) | Armenia | Jerewan | |
| Anders Chydenius Foundation | Finland | Kokkola | |
| Andes Libres | Peru | Cusco | |
| Antall József Knowledge Centre | Hungary | Budapest | 2003 |
| Anton Tunega Foundation | Slovakia | Bratislava | 1992 |
| Arbejderbevaegelsens Erhvervsrad | Denmark | Copenhagen | 1936 |
| Arkansas Advocates for Children and Families | USA | Little Rock | 1977 |
| Asian Institute of Policy Studies | | | |
| Asociacion Escuela Cristiana de Liderazgo | Peru | Iquitos | 2011 |
| Asociacion Nacional de Fomento Economico | Costa Rica | San Jose | 1958 |
| Asociacion de Consumidores Libres | Costa Rica | San José | |
| Association Culturelle Joseph Jacquemotte | Belgium | Brussels | 1961 |
| Association for Liberal Thinking | Turkey | Ankara | |
| Association for Modern Economy | | | |
| Association for the Development of the Romanian Social Forum (AD FSR) | Romania | Bucharest | 2005 |
| Association of Private Enterprise Education | | | |
| Associazione Bruno Trentin - ISF - IREF | Italy | Rome | 2014 |
| Atlantic Commission (Netherlands) | | | |
| Atlantik-Brücke e.V. | Germany | Berlin | 1952 |
| Atlas Initiative für Recht und Freiheit e.V. | Germany | Frankfurt am Main | 2019 |
| Atlas Network | USA | | 1981 |
| Atvisa visuomene ir jos draugai | Lithuania | Klaipėda | 2005 |
| Austrian Economics Center | Austria | Vienna | 2006 |
| Austrian Institute for European Security Policy | Austria | Maria Enzersdorf | 1996 |
| Avenir Suisse | Switzerland | Zürich | |
| BEworks | Canada | Toronto | 2010 |