| Center for Economic Development (CPHR) | Slovenia | Bratislava | |
| Center for Economics and Politics (CEP) | | | |
| Center for European Policy | Germany | Freiburg | 2006 |
| Center for European Policy Analysis | | | |
| Center for European Renewal | | | |
| Center for Financial Stability | USA | New York | 2009 |
| Center for Freedom and Prosperity | | | |
| Center for Institutional Analysis and Development | Romania | Bucharest | 2005 |
| Center for Liberal-Democratic Studies (CLDS) | Serbia | | |
| Center for Liberty Studies | Lithuania | | 2013 |
| Center for Social and Economic Research (CASE) | Poland | Warschau | |
| Center for Strategic and International Studies | | | |
| Center for the Rule of Law | | | |
| Center for the Study of Democracy (CSD) | Bulgaria | Sofia | |
| Center of Economic Research ETH Zürich | | Zürich | |
| Center on Global Prosperity of the Independent Institute | USA | | 1986 |
| Central Innovation Hub (at the Privy Council) | Canada | Ottawa, ON | 2015 |
| Centre Jean Gol | Belgium | Brussels | 2004 |
| Centre Party International Foundation | Sweden | Stockholm | 1995 |
| Centre d’Analyse Economique | | | |
| Centre for Analysis and Simulation of Air Operations | France | Lyon | |
| Centre for Analysis of Risk and Regulation (CARR) | UK | London | 2001 |
| Centre for Democracy and Development (Nigeria) | Nigeria | Abuja | 1997 |
| Centre for Development and Enterprise (South Africa) | South Africa | Johannesburg | 1995 |
| Centre for Economics and Politics (CEP) | Czech Republic | Prag | 1998 |
| Centre for Entrepreneurship and Economic Development (CEED) | | | |
| Centre for European Policy Studies | Belgium | Brussels | 1983 |
| Centre for European Reform (CER) | United Kingdom | | 1996 |
| Centre for European Studies | | | |
| Centre for Liberal Strategies (CLS) | Bulgaria | Sofia | |
| Centre for Medicine in the Public Interest | | | |
| Centre for Policy Alternatives | | | |
| Centre for Policy Studies (CPS) | United Kingdom | London | 1974 |
| Centre for Political Studies (CEPOS) | Denmark | Copenhagen | |
| Centre for Political Thought | Poland | Krakow | 1992 |
| Centre for Politics and Euro-Atlantic Partnership | | | |
| Centre for Research into Post-Communist Economies (CRCE) | United Kingdom | London | |
| Centre for Social and Economic Research (RSE) | Iceland | Reykjavík | |
| Centre for the New Europe | Belgium | Brussels | |
| Centre for the Study of Democracy and Culture | Czech Republic | Brno | 1993 |
| CentreForum | UK | London | 2005 |
| Centro Einaudi | Italy | Turin | |
| Centro Interdisciplinar de Etica e Economia Personalista | Brazil | Rio de Janeiro | 2002 |
| Centro Regional de Estrategias Economicas Sostenibles | Dominican Republic | Santo Domingo | 2009 |
| Centro Tocqueville Acton | Italy | Milan | 2007 |
| Centro de Analisis para Politicas Publicas | Dominican Republic | Santo Domingo, D.N. | |
| Centro de Divulgacion del Conocimiento Economico para la Libertad | Venezuela | Caracas | 1984 |
| Centro de Economia, Sociedad y Empresa (ESE) | Uruguay | Montevideo | |
| Centro de Estudios Economico-Sociales | Guatemala | Guatemala | 1959 |
| Centro de Estudios Equidad | Chile | Valparaíso | |
| Centro de Estudios Legales sobre el Terrorismo y sus Victimas | Argentina | Buenos Aires | |
| Centro de Estudios Libertad y Responsabilidad | Argentina | | |
| Centro de Estudios Publicos - Chile | Chile | Santiago de Chile | 1980 |
| Centro de Estudios de la Realidad Economica y Social | Uruguay | Montevideo | |
| Centro de Estudios para el Desarrollo | Uruguay | | |
| Centro de Implementacion de Politicas Publicas para la Equidad y el Crecimiento | Argentina | Buenos Aires | 2000 |
| Centro de Investigacion de Instituciones y Mercados de Argentina | Argentina | Buenos Aires | |
| Centro de Investigacion de Medios y Sociedad Andes | Chile | Santiago de Chile | |
| Centro de Investigacion para el Desarrollo, A. C. | Mexico | | 1984 |
| Centro de Investigacion y Estudios Legales | Peru | | 1989 |
| Centro de Investigaciones Economicas Nacionales | Guatemala | Guatemala | 1981 |
| Centro de Investigaciones sobre la libre empresa | Mexico | Mexico D.F. | |
| Centro del Liberalismo Clásico | | | |
| Centro para la Apertura y el Desarrollo de America Latina | Argentina | Buenos Aires | 2003 |
| Centro para la Apertura y el desarrollo de America Latina | Uruguay | Montevideo | |
| Centro para la Libertad y el Desarrollo | Peru | Virtual Organisation (no headquarter) | 2011 |
| Centro per la riforma dello stato | Italy | Rome | 1972 |
| Centrum Liberalnich Studii | Czech Republic | Prague | 1994 |
| Centrum Pieter Gillis | | | |
| Cercle Frédéric Bastiat | | | |
| Chatham House | | | |
| Chifley Research Center | Australia | Kingston, ACT | 2000 |
| Circulo de Empresarios | Spain | Madrid | 1977 |
| Ciudadano Austral | Chile | Castro | |
| Civic Institute | Czech Republic | Prag | |
| Civil Society Coalition on Climate Change | | | |
| Civil Society Institute (iFRAP) | France | Paris | 1981 |
| Civil-Military Cooperation | Netherlands | The Hague | |
| Civis | | | |
| Civismo | Spain | Pamplona | 2009 |
| Civita | Norway | Oslo | |
| Civitas | United Kingdom | London | 2000 |
| Clemson Institute for the Study of Capitalism | | | |
| Clexit | | | |
| Club 2015 | | | |
| Cobden Centre | | | |
| Cogito | Sweden | Stockholm | 1995 |
| Cold Weather Operations | Norway | Bodø | |
| Cologne Institute for Economic Research | Germany | Köln | 1951 |
| Combined Joint Operations from the Sea | USA | Norfolk | |
| Command and Control | Netherlands | Utrecht | |
| Committee For A Constructive Tomorrow | USA | Washington DC | 1985 |
| Compact | | Leipzip | 2010 |
| Competitive Enterprise Institute | | | 1984 |
| Competitive Malta | | | |
| Conservative Institute of M. R. Stefanik | Slovakia | Bratislava | 1999 |
| Conservative Technology Forum | | | |
| Constantine Karamanlis Institute for Democracy | Greece | Athens | 1998 |
| Contribuables Associés | | | |
| Cooperative Cyber Defence | Estonia | Tallinn | |
| Coordinadora por la Inversion y el Trabajo | Peru | Lima | 2004 |
| Corporacion Excelencia en la Justicia | Colombia | Bogotá | 1996 |
| Council for National Policy | | | |
| Council on Foreign Relations | | | |
| Council on Public Policy | Germany | Bayreuth | 2001 |
| Counter Intelligence | Poland | Krakow | |
| Counter-Improvised Explosive Devices | Spain | Madrid | |
| Crisis Management and Disaster Response | Bulgaria | Sofia | |
| Croatian Statehood Foundation (ZHDZ) | Croatia | Zagreb | 1995 |
| Cul:tra | Portugal | Lisbon | |
| Cultural Association Punto Rosso | Italy | Milan | 1991 |
| Círculo Acton Chile | Australia | | |
| Danish Nudging Network | Denmark | | 2010 |
| De Gasperi Foundation | Italy | Rome | 1982 |
| De Warande | | | |
| Defence Against Terrorism | Turkey | Ankara | |
| Degussa Sonne/Mond Goldhandel GmbH | Germany | Munich; Frankfurt | 2010 |
| Democracia & Desarrollo Internacional | Peru | Lima | 2008 |
| Democracy Lab- Costa Rica | Costa Rica | | |
| Democracy in Africa Research Unit (South Africa) | South Africa | Cape Town | 2002 |
| Democracía & Mercado | Chile | Santiago de Chile | 2009 |
| Democratic Civic Association (DCA) | Finland | Helsinki | 1986 |
| Demos (LT) | Lithuania | Vilnius | 2008 |
| Desiderius-Erasmus-Stiftung | Germany | Berlin | 2015 |
| Deutsche Bank Research | Germany | Frankfurt am Main | |
| Deutsche Gesellschaft für Auswärtige Politik (German Council on Foreign Affairs) | | | 1945 |
| Deutsches Institut für Urbanistik | | | |
| Deutsches Institut für Wirtschaftsforschung e.V. | | Berlin | |
| Deutschlandbewegung | Germany | Starnberg | |
| Die Familienunternehmer - ASU | Germany | Berlin | 1949 |
| Die Freie Welt | Germany/EU | 10119 Berlin | 2008 |
| Diktio Network | Greece | | 2013 |
| E.G. West Centre | United Kingdom | Newcastle | |
| E2T2 Hellenic Conservatives and Reformists' Think Tank | Greece | Glyfada | |
| ECIPE | Belgium | Brüssel | 2006 |
| ECONWATCH | Germany | Berlin | 2007 |
| EIKE | Germany | Jena | 2007 |
| EIPF | | | |
| ESEADE | Argentina | Buenos Aires | 1978 |
| Earhart Foundation | | | |
| EcoAustria | Austria | Wien | 2011 |
| Economic Freedom and Social Progress Association | | | |
| Economic Policy Institute | USA | Washington, D.C. | 1986 |
| Economic Policy Research Institute (EPRI) | | | |
| Economic and Social Research Center | Austria | Vienna | 2000 |
| Economic and Social Research Institute | Ireland | Dublin | 1960 |
| Economica Institut für Wirtschaftsforschung | | | |
| Ecopolis Foundation | Hungary | | 2010 |
| EdChoice | USA | Indianapolis | 1996 |
| Edmund Burke Institute | | | |
| Eduardo Frei Stichting | Netherlands | The Hague | 1970 |
| Education for Democracy Foundation | | | |
| Educational Initiative for Central and Eastern Europe (EICEE) | | | |
| Eigentümlich Frei | Germany | 40549 Düsseldorf | 1998 |
| Ein Prozent | | 02797 Kurort Oybin | 2015 |
| Einaudi Institute for Economics and Finance | Italy | Rome | 2008 |
| El Ojo Digital | Argentina | | |
| Energy Security | Lithuania | Vilnius | |
| Entscheidung für´s Leben | Germany | 10119 Berlin | |
| Espaces Marx | France | Paris | 1995 |
| Estat.cz | Czech Republic | Prague | 2004 |
| Estudantes Pela Liberdade | Brazil | Network - no headquarter | |
| Estudiantes por la Libertad | Washington DC | | |
| Etopia | Belgium | Namur | 2005 |
| Eudoxa | Sweden | Stockholm | |
| Eurolib Network | France | | 2004 |
| Europa Institut | | | |
| EuropaNova | France/EU | Paris | 2003 |
| Europartenaires | France | Paris | 1994 |
| Europe of Citizens Foundation | Spain | Madrid | 1998 |
| European Academy for Democracy | Czech Republic | Prague | 1991 |
| European Academy of Yuste | | | |
| European Alternatives | Italy | Rome | 2007 |
| European Center of Austrian Economics Foundation | Liechtenstein | Vaduz | 2004 |
| European Coalition for Economic Growth | Austria | Vienna | 2006 |
| European Committee For A Constructive Tomorrow | Germany | Jena | |
| European Council on Foreign Relations | | | |
| European Dignity Watch | Belgium | Brussels | 2010 |
| European Energy Institute | | | |
| European Enterprise Institute | Belgium | Brussels | 2004 |
| European Forum for Democracy and Solidarity | Netherlands | Amsterdam | 1993 |
| European Ideas Network (EIN) | Belgium | Brüssel | 2002 |
| European Institute for Climate and Energy | | | |
| European Law Institute | | | 2011 |
| European Liberal Forum | Belgium | Brussels | 2007 |
| European Liberal Youth (LYMEC) | Belgium | Brussels | 1976 |
| European Network of Political Foudations | | | |
| European Network of Political Foundation (ENoP) | | | |
| European Policy Center | Belgium | Brussels | 1996 |
| European Policy Forum | UK | London | 1992 |
| European Policy Information Center | | | 2014 |
| European Renewal | Netherlands | Amsterdam | 2007 |
| Europäisches Institut für Klima und Energie | Germany | Jena | 2007 |
| Evropska Akademie pro Demokracii | Czech Republic | Jihlava | 1991 |
| Explosive Ordnance Disposal | Slovakia | Trenčín | |
| F.A.Hayek Foundation (Slovakia) | | | |
| F.A.Hayek Foundation Bratislava | | | |
| FEMAN | Slovakia | Kosice | 2000 |
| FIEL - Fundacion de Investigaciones Economicas Latinoamericanas | Argentina | Buenos Aires | 1964 |
| Federalismo y Libertad | Argentina | | 2012 |
| Finnish Business and Policy Forum (EVA) | Finland | Helsinki | |
| Flemish People's Movement | | | |
| Fondation Copernic | France | Paris | 1998 |
| Fondation Gabriel Péri | France | Pantin | 2004 |
| Fondation Jean-Jaurès | France | Paris | 1992 |
| Fondation Robert Krieps | Luxembourg | Luxembourg | 2006 |
| Fondation Robert Schuman | France | Paris | 1991 |
| Fondation de l'Ecologie Politique | France | Paris | 2012 |
| Fondation pour l'Innovation Politique | France | Paris | 2004 |
| Fondazione Critica Liberale | Italy | Rome | 1994 |
| Fondazione Farefuturo | Italy | Rome | 2007 |
| Fondazione Foedus | Italy | Rome | 2003 |
| Fondazione Istituto Gramsci | Italy | Rome | 1950 |
| Fondazione ItalianiEuropei | Italy | Rome | 1998 |
| Fondazione Liberal | Italy | Rome | 1995 |
| Fondazione Respublica | Italy | Milano | 1999 |
| Fondazione Socialismo | Italy | Rome | 2009 |
| Fondazione Ugo Spirito e Renzo De Felice | Italy | Rome | 1981 |
| Fondazzjoni Ideat | Malta | Hamrun | 2009 |
| Forma, Formacion y Accion | Venezuela | | 2003 |
| Foro de Estudios sobre la Administracion de Justicia | Argentina | Buenos Aires | |
| Forschungsinstitut zur Zukunft der Arbeit | Germany | Cologne | 1998 |
| Forschungsseminar Radein zum Vergleich von Wirtschafts- und Gesellschaftssystemen e.V. | Germany | Pforzheim | 1967 |
| Forum Velden | | Klagenfurt | 2007 |
| Forum for Greece | Greece | Athens | 2010 |
| Forum for Reforms, Entrepreneurship and Sustainability (FORES) | Sweden | Stockholm | 2007 |
| Foundation Hope for Haiti, Inc. | Florida | Royal Palm Beach | |
| Foundation for Economic Education | | | |
| Foundation for European Progressive Studies (FEPS) | Belgium | Brussels | 2008 |
| Foundation for Fundamental Rights | Poland | Warsaw | 2007 |
| Foundation for Market Economy (FME) | Hungary | Budapest | |
| Foundation for Marxist Studies | Spain | Madrid | 1978 |
| Foundation for Occidental Ethics and Culture (STAB) | Switzerland | Zurich | 1968 |
| Foundation for Social Studies and Analysis | | | |
| Foundation for a Civic Hungary | Hungary | Budapest | 2003 |
| Fraser Institute | Canada | Vancouver; offices in Montreal, Calgary and Toronto | 1974 |
| Free Minds Association | Aserbeidschan. | Baku | |
| Freedom and Reform Institute | Hungary | Budapest | |
| Freedom and Solidarity Foundation | Latvia | Riga | 2007 |
| Freedom to Trade Initiative | | | |
| FreedomWorks | | | |
| Freiheits Akademie (Oesterreich) | Austria | Vienna | 2012 |
| Freiheitsakademie | Austria | Wien | 2012 |
| Freiheitswerk | Germany | | |
| French Nudge Project | France | Paris | |
| Friedrich August von Hayek-Stiftung für eine freie Gesellschaft | Germany | Berlin | |
| Friedrich Ebert Stiftung | | | |
| Friedrich Ebert Stiftung (FES) | Germany | Bonn | 1947 |
| Friedrich Naumann Stiftung für die Freiheit | Germany | Potsdam | 1958 |
| Friedrich von Hayek Stiftung | Germany | Freiburg | 1999 |