| 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 |
| Friends of Europe | | | |
| Fronteiras do Pensamento | Brazil | Porto Alegre | 2006 |
| Frédéric Bastiat Stichting | Netherlands | Amsterdam | |
| Fundacio Gabriel Alomar | Spain | Palma Illes Balears | 2006 |
| Fundacion Atlas 1853 - para una sociedad libre | Argentina | Buenos Aires | 1998 |
| Fundacion Bases | Argentina | Rosario | 2004 |
| Fundacion Burke | Spain | Madrid | |
| Fundacion Centro de Pensamiento Primero Colombia | Colombia | Bogotá | 2007 |
| Fundacion Chile Interactural | Chile | Temuco | |
| Fundacion Civico Republicana | Argentina | Buenos Aires | |
| Fundacion Club de la Libertad | Argentina | Corrientes | 2013 |
| Fundacion Contemporanea | Argentina | Buenos Aires | 1992 |
| Fundacion EQUO | Spain | Madrid | 2011 |
| Fundacion Ecuador Libre | Ecuador | Guayaquil | |
| Fundacion Eleutera | Honduras | San Pedro Sula | 2013 |
| Fundacion Global | Argentina | Mar del Plata | 1996 |
| Fundacion Hayek Colombia | Colombia | Bogotá | |
| Fundacion Iberoamerica Europa | Spain | Madrid | 1981 |
| Fundacion Instituto David Hume | Argentina | Ciudad de Buenos Aires | |
| Fundacion Internacional para la Libertad | Argentina | orginally based Madrid, moved to Rosario (Argentina) | 2003 |
| Fundacion Internacionalismo Democratico | Colombia | | |
| Fundacion Issos para la Libertad y el Desarrollo | Paraguay | Belén | |
| Fundacion Jaime Guzman | Chile | | 1991 |
| Fundacion Jovenes Lideres | Argentina | Buenos Aires | |
| Fundacion Libertad | Argentina | Santa Fe | 1988 |
| Fundacion Libertad - Panama | Panama | | |
| Fundacion Libertad Paraguay | Paraguay | | 1999 |
| Fundacion Libertad y Progreso | Argentina | Buenos Aires | |
| Fundacion Nicaragüense para el Desarrollo Economico y Social | Nicaragua | Managua | |
| Fundacion Nueva Democracia | Bolivia | Santa Cruz de la Sierra | 2008 |
| Fundacion Pablo Iglesias | Spain | Madrid | 1977 |
| Fundacion Para el Desarrollo Integral de la Sociedad | Dominican Republic | | |
| Fundacion Pensar | Argentina | | |
| Fundacion Pensar Peru | Peru | | |
| Fundacion Rafael Preciado Hernandez, A.C. | Mexico | Mexico City | 1993 |
| Fundacion Rafael del Pino | Spain | | |
| Fundacion Salvadorena para el Desarrollo Economico y Social | El Salvador | | 1983 |
| Fundacion para el Analisis y los Estudios Sociales (FAES) | Spain | Madrid | 1989 |
| Fundacion para el Progreso | Chile | Santiago de Chile | 2011 |
| Fundacion para la Responsabilidad Intelectual | Argentina | Buenos Aires | |
| Fundació Catalunya Oberta (FCO) | Spain | Barcelona | |
| Fundació Nous Horitzons | Spain | Barcelona | 1992 |
| Fundació Rafael Campalans | Spain | Barcelona | 1979 |
| Fundacja Industrial | Poland | Lódz | 2007 |
| Fundacja Klub Obywatelski | Poland | Warsaw | 1998 |
| Fundacja Projekt Polska | Poland | Warsaw | 2007 |
| Fundacja Republikańska | | | |
| Fundatia Institutul Ovidiu Sincai | Romania | Bucharest | 2002 |
| Fundação Res Publica | Portugal | Lisbon | 2008 |
| Fórum da Liberdade | | | |
| Förderstiftung konservative Bildung und Forschung | Germany | Berlin | 2000 |
| Galician Society for Freedom and Democracy | Spain | Tui | 2009 |
| Gauche reformiste europeenne | Belgium | Brussels | 2006 |
| Gdansk Institute for Market Economics | Poland | Gdańsk | 1989 |
| Geneva Centre for Security Policy | | | |
| Ghana Center for Democratic Development | Ghana | Legon-Accra | 1998 |
| Global Agenda Council - Water Security | Switzerland | | |
| Global Government Forum | UK | | 2014 |
| Global Vision | United Kingdom | London | |
| Global Warming Policy Forum | United Kingdom | London | 2009 |
| Global Warming Policy Foundation | United Kingdom | London | 2009 |
| Goldwater Institute | | | |
| GovLab (NYU) | USA | New York | 2012 |
| Government Innovators Network | USA | Cambridge, MA | |
| Greek Green Institute | Greece | Athens | 2011 |
| Green Economics Institute | UK | Reading | 2004 |
| Green European Foundation | Luxembourg | Luxembourg | 2008 |
| Green Forum Foundation | Sweden | Stockholm | 1995 |
| Green Foundation Ireland | Ireland | | 2011 |
| Green Thought Association | Turkey | Istanbul | 2008 |
| Group for Legal and Political Studies | Kosovo | Prishtina | |
| Gruene Bildungswerkstatt | Austria | Vienna | 1987 |
| Grupo Refundar | Argentina | | |
| Gréng Stëftung | Luxembourg | Luxembourg | 2009 |
| Grüne Bildungswerkstatt | Austria | Vienna | 1987 |
| HACER | USA | Washington | 1996 |
| Hamburg Institute for International Economics | Germany | Hamburg | 2005 |
| Hanns Seidel Stiftung | Germany | Munich | 1967 |
| Harvard Behavioural Insights Group | USA | Cambridge, MA | |
| Haya van Someren Stichting/VVD International | Netherlands | The Hague | 1981 |
| Hayek Institute | Austria | Vienna | 1993 |
| Hayek Institute of Brussels | | | |
| Hayek-Gesellschaft | Germany | Berlin | 1998 |
| Health Consumer Powerhouse (HCP) | Sweden | Danderyd | 2004 |
| Health Foundation, The | UK | London | 2001 |
| Health Policy Institute | Slovakia | Prokopova 15, 851 01 Bratislava | 2005 |
| Health Reform.cz | Czech Republic | Prag | 2004 |
| Heartland Institute | USA | Chicago | 1986 |
| Heinrich Böll Stiftung | Germany | Berlin | 1997 |
| Hellenic Leadership Institute (HLI) | Greece | Athen | |
| Heritage Foundation | | | |
| Honduras Investiga | Honduras | San Pedro Sula | |
| Hoover Institution | | | |
| Http://www.friendsofeurope.org/ | | | |
| Hudson Institute | | | |
| Human Intelligence | Romania | Oradea | |
| IDEA | Germany | 35528 Wetzlar | 1970 |
| IDEAL Instituto Desarrollo Ambiente y Libertad IDEAL Latinoamerica | Costa Rica | Heredia | |
| IDL-Instituto Amaro da Costa | Portugal | Lisbon | 1975 |
| IMANI | | | |
| INudgeyou | Denmark | Copenhagen | 2010 |
| IPPR (Institute for Public Policy Research) | UK | London | 1988 |
| ISA - Instituto de estudios para una Sociedad Abierta | Panama | | 2009 |
| IZA - Institute of Labor Economics | Germany | Bonn | 1998 |
| Icelandic Research Centre for Innovation and Economic Growth | Iceland | Reykjavík | 2012 |
| Ideas | Spain | Madrid | 2008 |
| Ideas42 | USA | New York | 2008 |
| Identitäre Bewegung | Germany | 33184 Altenbeken | 2014 |
| Ifo Institut für Wirtschaftsforschung | Germany | Munich | 1949 |
| Information Society Alliance EURIM | | | |
| Initiative Familienschutz | Germany | Berlin | |
| Initiative Neue Soziale Marktwirtschaft | Germany | 10117 Berlin | 1999 |
| Initiative for Public Policy Analysis | Nigeria | | |
| Initiative for Science, Society and Policy | Denmark | Odense | 2009 |
| Innovation Journal | Canada | | 1995 |
| Institucion Futuro | Spain | Huarte | |
| Institución Futuro | | | |
| Institut Constant de Rebecque | Switzerland | Lausanne | |
| Institut Coppet | France/EU | Paris | 2010 |
| Institut Economique Molinari | Belgium | Brussels | 2003 |
| Institut Euro 92 | France | | |
| Institut Montaigne | France | Paris | 2004 |
| Institut Qualitaet in der Politik | Austria | | 2013 |
| Institut Thomas More | | | |
| Institut Turgot | | | 2002 |
| Institut dr. Jozeta Pucnika | Slovenia | Ljubljana | |
| Institut fuer Wertewirtschaft | Austria | Vienna | 2007 |
| Institut fuer soziale Gegenwartsfragen | Germany | Stuttgart | 1991 |
| Institut für Demographie, Allgemeinwohl und Familie e.V. | | 53757 Sankt Augustin | 2011 |
| Institut für Gesundheits- und Sozialforschung | Germany | Berlin | 1980 |
| Institut für Qualität der Politik | Austria | | 2013 |
| Institut für Sozialforschung und Gesellschaftspolitik | Germany | Cologne | 1952 |
| Institut für Staatspolitik | Germany | Steigra | 2000 |
| Institut für strategische Studien Berlin | Germany | Berlin | |
| Institute Emile Vandervelde | Belgium | Brussels | 1946 |
| Institute Thomas More | Belgium | Brüssel | 2003 |
| Institute de Formation Politique | | Paris | |
| Institute dr. Janez Evangelist Krek | Slovenia | Ljubljana | 2009 |
| Institute for Development and Social Initiatives (IDIS) | Moldova | Chişinău | 1993 |
| Institute for East West Security Studies | | | |
| Institute for Economic Development and Social Reform (INEKO) | | | |
| Institute for Economic Education | | | |
| Institute for Economic Studies Europe (IES) | France | Aix-en-Provence | |
| Institute for Economic and Social Reforms (INEKO) | Slovakia | Bratislava | 1999 |
| Institute for Free Enterprise | Germany | Berlin | 1998 |
| Institute for Government (UK) | UK | London | 2008 |
| Institute for Human Studies | USA | | |
| Institute for Humane Studies-Europe | | | |
| Institute for Innovation & Valuation in Health Care | Germany | Wiesbaden | |
| Institute for Labour Studies (ILS) | Slovenia | Ljubljana | 2012 |
| Institute for Liberal Studies (Romania) | Romania | Bucharest | 2006 |
| Institute for Lifestyle Options and Longevity (ILOL) | Czech Republic | Zeleneč | |
| Institute for Market Economics (IME) | Bulgaria | Sofia | |
| Institute for Modern Slovakia | Slovakia | Bratislava | 2007 |
| Institute for Popular Studies | Romania | Bucharest | 2008 |
| Institute for Public Affairs | | | |
| Institute for Research in Economics and Fiscal Issues (IREF) | | | |
| Institute for Research on Economic and Fiscal Issues | France | Paris | 2002 |
| Institute for Security Studies (South Africa) | South Africa | Pretoria | 1991 |
| Institute for Social Integration | Bulgaria | Sofia | 2002 |
| Institute for Social-Ecological Economy Research | Germany | Munich | 1990 |
| Institute for Strategic Studies and Prognoses (ISSP) | Montenegro | Podgorica | |
| Institute for Strategic and Development Studies (ISTAME) | Greece | Athens | 1995 |
| Institute for Transitional Democracy and International Security (ITDIS) | Hungary | Budapest | |
| Institute for cultural diplomacy (icd) | Germany | Berlin | 1999 |
| Institute of African Economics | | | |
| Institute of Democratic Politics (Lithuania) | Lithuania | Vilnius | 1999 |
| Institute of Economic Affairs | United Kingdom | | 1955 |
| Institute of Economic Affairs (Kenya) | Kenya | Nairobi | 1994 |
| Institute of Economic and Social Studies | Slovakia | Bratislava | 2006 |
| Institute of Euro-Atlantic Cooperation | | | |
| Institute of Political Studies of the Polish Academy of Science | | | |
| Institute of Public Affairs (Australia) | Australia | Melbourne | 1943 |
| Institute of Public Affairs (Instytut Spraw Publicznych) | | | |
| Institute on Governance | Canada | Ottawa | 1990 |
| Instituto Accion | Peru | Lima | 2005 |
| Instituto Acton Argentina | Argentina | | 1990 |
| Instituto Cultural Ludwig Von Mises | Mexico | | |
| Instituto Democracia y Mercado | Chile | Santiago de Chile | 2008 |
| Instituto Ecuatoriano de Economia Politica - IEEP | Ecuador | Guayaquil | 1991 |
| Instituto Eurodemokratias Glafko Klerides | Cyprus | Nicosia | 1999 |
| Instituto Francisco Sa Carnero | Portugal | Lisbon | 1980 |
| Instituto Francisco Sá Carneiro | Portugal | Lisbon | 1980 |
| Instituto Invertir | Peru | Líma | |
| Instituto Juan de Mariana | Spain | Madrid | 2005 |
| Instituto Liberal | Brazil | Rio de Janeiro | 1983 |
| Instituto Liberal de Sao Paulo | Brazil | São Paulo | 2014 |
| Instituto Liberdade | Brazil | Porto Alegre | 2004 |
| Instituto Libertad | Costa Rica | Cartago | 2001 |
| Instituto Libertad y Democracia | Peru | Lima | 1979 |
| Instituto Libertad y Progreso | Colombia | | |
| Instituto Ludwig von Mises Brasil | Brazil | | |
| Instituto Luigi Sturzo | Italy | Rome | 1951 |
| Instituto Manuel Oribe | Uruguay | | 1985 |
| Instituto Millenium | Brazil | Rio de Janeiro | 2005 |
| Instituto Mises Hispano | USA | Auburn, Alabama | 2018 |
| Instituto Peruano de Economia | Peru | Lima | 1994 |
| Instituto Peruano de Economía | Peru | Lima | 1994 |
| Instituto Politico para la Libertad | Peru | Lima | |
| Instituto Res Publica | Chile | Santiago de Chile | |
| Instituto Veritas | Honduras | | |
| Instituto de Ciencia Politica | Colombia | Bogotá | 1987 |
| Instituto de Ciencia, Economia, Educacion y Salud | Bolivia | Santa Cruz de la Sierra | |
| Instituto de Desarrollo Empresarial y Accion Social IDEAS | Costa Rica | San José | 2013 |
| Instituto de Estudios Estrategicos e Internacionales | Spain | Madrid | 1970 |
| Instituto de Estudios Estrategicos y Politicas Publicas | Nicaragua | Managua | 2004 |
| Instituto de Estudios de Libre Comercio | | | |
| Instituto de Estudios de la Accion Humana | Peru | | |
| Instituto de Estudios de la Sociedad | Chile | Santiago de Chile | 2006 |
| Instituto de Estudos Empresariais | Brazil | Porto Alegre | 1984 |
| Instituto de Estudos para o Desenvolvimento | Portugal | Lisbon | 1979 |
| Instituto de Formacao de Lideres | Brazil | Belo Horizonte | |
| Instituto de Libre Empresa | Peru | | 1998 |
| Instituto de Pensamiento Estrategico Agora S.A. | Mexico | | |
| Instituto para la Libertad y el Analisis de Politicas | Costa Rica | | |
| Instituto von Mises Barcelona | Spain | Barcelona | 2008 |
| Instytut Globalizacji | Poland | Gliwice | |
| Instytut Sobieskiego | | | 2005 |
| Inter Region Economic Network | Kenya | | |
| Interamerican Institute for Democracy | USA | Miami | |
| Intercollegiate Studies Institute | USA | Wilmington | |
| International Atlantic Economic Society | | | |
| International Center for Pension Reform | Chile | | |
| International Democratic Initiative Foundation D66 (IDI) | Netherlands | The Hague | 1990 |
| International Educational Centre (IEC) | Croatia | Zagreb | 2005 |
| International Federation of Liberal Youth | United Kingdom | London | 1979 |
| International Foundation for Research in Experimental Economics | | | |
| International Institute for Strategic Studies | | | |
| International Institute of Strategic Studies | | | |
| International Leaders Summit | | | |
| International Policy Network | | | |
| International Republican Institute | USA | Washington, D.C. | 1983 |
| Intertic | Italy | Mailand | |
| Inštitut dr Janeza Evangelista Kreka | Slovenia | Ljubljana | 2009 |
| Istanbul Network for Liberty | | | |
| Istituto Acton | Italy | Rome | 2003 |
| Istituto Bruno Leoni | Italy | Turin | |
| Istituto Europeo per lo Studio del Comportamento Umano | Italia | Parma | 2004 |
| Itinera Institute | Belgium | Brussels | 2006 |
| Ius et Lex | | | |
| Jarl Hjalmarson Foundation | Sweden | Stockholm | 1994 |
| Jerusalem Institute for Market Studies | Israel | Jerusalem | |
| Johannes Mikhelson Centre | Estonia | Tartus | 1993 |
| John Stuart Mill Institut für Freiheitsforschung | Germany | Heidelberg | |
| John Templeton Foundation | | | |
| Joint Air Power Competence Centre | Germany | Kalkar | |
| Joint Chemical, Biological, Radiological and Nuclear Defence | Czech Republic | Vyškov | |
| Joint Research Centre | EU/Belgium | | |
| Journal Sozialismus | Germany | Hamburg | 1972 |
| Joze Pucnik Institute | Slovenia | Ljubljana | 2006 |
| Juan de Mariana Institute | Spain | Madrid | |
| Julius Raab Stiftung | Austria | Vienna | 1961 |
| Julius-Raab-Stiftung | Austria | Wien | 1961 |
| Junge Freiheit | Germany | | 1986 |
| Junge Landsmannschaft Ostdeutschland | | | 1991 |
| Junior Achievement of Argentina | Argentina | | |
| József Attila Foundation | Hungary | Budapest | |
| K. Pulaski Foundation | | | |
| Kalander Foundation | Slovenia | Ljubljana | 1993 |
| Kalevi Sorsa Säätiö | Finland | Helsinki | 2005 |
| Karl Renner Institut | Austria | Vienna | 1972 |
| Katon Association | | | |
| Klub Jagielloński | | | |
| Konrad Adenauer Stiftung | Germany | Sankt Augustin/Bonn | 1955 |
| Konvent für Deutschland | Germany | Berlin | |
| Kristdemokratiskt Internationellt Centre | Sweden | Stockholm | 2005 |
| Kós Károly Academy Foundation | Romania | Targu Mures | 2010 |
| LIBERA Bolivia | Bolivia | La Paz | |
| Latin American and Iberian Law and Economics Association | Peru | | 1995 |
| Latinoamerica Libre | Chile | Santiago de Chile | |
| Left Forum | Finland | Helsinki | 2007 |
| Legatum Institute | UK | London | 2007 |
| Letras Libres | Mexico | | |
| LibMov (Italy) | Italy | Parma | |
| Libera | Finland | | |
| Libera! | Belgium | Brussels | 2010 |
| Liberaal Kennis Centrum | Belgium | Brussels | |
| Liberal Academy Tbilisi | Georgia | Tiflis | 2006 |
| Liberal Flemish Students Organization (LVSV) | Belgium | | |
| Liberal Institute | Switzerland | | 1979 |
| Liberal Institute for Political Analyses (LIPA) | Bulgaria | Sofia | 2010 |
| Liberal Politological Institute (LPI) | Bulgaria | Sofia | 2004 |
| Liberal Society Foundation | Slovakia | Bratislava | 1995 |
| Liberal Vision | | | |
| Liberales | Belgium | Gent | 2002 |
| Liberales Institut | Switzerland | Zürich | 1979 |
| Liberales Zukunftsforum | Austria | Vienna | 2011 |
| Liberalismo Whig | | | |
| Liberalismo.org | | | |
| Liberalni Institute | Czech Republic | Prague | 1989 |
| Liberia Democracy Watch | Liberia | Monrovia | 1996 |
| Libertad Digital | | | |
| Libertarian Alliance | United Kingdom | | |
| Libertarian Party of Australia | Australia | Burwood, Victoria | 2020 |
| Liberty Australia | Australia | Brunswick | 2011 |
| Liberty Fund Inc. | | | |
| Liberty International | USA | San Francisco | 1980 |
| Liberté Chérie | France | Paris | |
| Library of Economics and Liberty | | | |
| Libremente.net | Argentina | | |
| Libro Libre | Costa Rica | | |
| Liderazgo y Vision, A. C. | Venezuela | Caracas y Valencia | 1995 |
| Lideres do Amanha | Brazil | Vitória | |
| List-Gesellschaft | Germany | Münster | |
| Lithuanian Free Market Institute | Lithuania | Vilnius | 1990 |
| Ludwig Erhard Foundation | | | |
| Ludwig von Mises Institut Deutschland | Germany | Munich | 2012 |
| Ludwig von Mises Institute | USA | Auburn, Alabama | 1982 |
| Ludwig von Mises Institute Canada | Canada | Toronto | 2010 |
| Ludwig von Mises Institute Europe | Belgium | Leuven | 2001 |
| Ludwig von Mises Institute Poland | Poland | Warschau | 2003 |
| Ludwig von Mises Institute Romania | Romania | | 2001 |
| Luigi Sturzo Institute | Italy | Rome | 1951 |
| LyD - Libertad y Desarrollo | Chile | Santiago de Chile | 1990 |
| M.E.S.A. 10 | Slovakia | Bratislava | 1992 |
| MESA 10 | | | |
| Mackinac Center | | | |
| Magma (Finland) | Finland | Helsinki | 2008 |
| Magna Carta Foundation | Italy | Rome | 2004 |
| Management club (Austria) | Austria | Vienna | 1972 |
| Manhattan Institute | | New York | 1977 |
| Manifesto Foundation | Norway | Oslo | 2003 |
| Markedscentret | | | |
| Mas Por Libertad | Mexico | Mexico City | |
| Masarykova demokratická akademie | Czech Republic | Prague | 1991 |
| Mathematica Policy Research | USA | Princeton, NJ | |
| Max Van Der Stoel Stichting | Netherlands | Amsterdam | 2013 |
| Max-Planck-Institut für Steuerrecht und Öffentliche Finanzen | Germany | München | 2011 |
| Medunarodni Edukacijski Centar | Croatia | Zagreb | 2008 |
| Mercatus Center | | | |
| Mercurius Society | | | |
| Mexico Business Forum | Mexico | | 1996 |
| Mexico Evalua | Mexico | Mexico City | |
| Military Engineering | Germany | Ingolstadt | |
| Military Medicine | Hungary | Budapest | |
| Military Police | Poland | Bydgoszcz | |
| Milken Institute | | | |
| Millenium Institute | | | |
| Mind, Behaviour, and Development Team (World Bank) | International | Washington, D.C. | 2015 |
| Mindlab (DK) | Denmark | Copenhagen | |
| Miquel Coll I Alentorn Institute of Humanistic Studies | Spain | Barcelona | 1992 |
| Mises Colombia | Colombia | Medellin | 2012 |
| Mises Czech Republic | Czech Republic | | 2016 |
| Mises Ecuador | | | 2010 |
| Mises Estonia | Estonia | Tallinn | 2012 |
| Mises Finland | Finland | | 2011 |
| Mises Global | | | |
| Mises Israel | | | |
| Mises Japan | | | 2011 |
| Mises Netherlands | Netherlands | Utrecht | 2013 |