The Open Society Institute (OSI) is a private operating and grant-making foundation based in New York City that serves as the hub of the Open Society Network, a group of autonomous foundations and organizations in over 50 countries. This network implements a range of initiatives that aim to promote open society by shaping government policy and supporting education, media, public health and human and women’s rights, as well as social, legal and economic reform. To diminish and prevent the negative consequences of globalization, the Network seeks to foster global open society by increasing collaboration with other nongovernmental organizations, governments and international institutions. OSI was created in 1993 by investor and philanthropist George Soros to support his foundations in Central and Eastern Europe and the former Soviet Union. Those foundations were established, starting in 1984, to help former communist countries in their transition to democracy. The Network has expanded its geographic reach to include foundations and initiatives in Africa, Central Asia and the Caucasus, Haiti, Latin America, Mongolia, Southeast Asia, Turkey and the United States. OSI also supports selective projects in other parts of the world. 

The network programs are coordinated by the  Open Society Institute - New York

The national foundations are, in most cases, autonomous nongovernmental organizations. Foundations cooperate, share their experience. Each national foundation has a board which set the priorities for the foundation's work, according the situation, country and its needs.

Open Society Foundation for Albania
OSI Assistance Foundation-Armenia
OSI Assistance Foundation-Azerbaijan
Open Society Fund-Bosnia and Herzegovina
Open Society Foundation-Sofia (Bulgaria)
Open Society Fund-Prague (Czech Republic)
Open Estonia Foundation
Open Society Georgia Foundation  
Fundacion Soros-Guatemala 
Fondation Connaissance et Liberté, Haiti
Soros Foundation-Hungary
Soros Foundation-Kazakhstan
Soros Foundation-Kyrgyzstan
Soros Foundation-Latvia
Open Society Institute-Macedonia
Soros Foundation-Moldova
Open Society Institute-Mongolia
Stefan Batory Foundation (Poland)
Open Society Foundation Romania
Fund for an Open Society - Serbia
Open Society Foundation-Bratislava (Slovakia)   
Open Society Foundation for South Africa   
OSI Initiative for Southern Africa
OSI Assistance Foundation -Tajikistan   
OSI Assistance Foundation - Turkey
International Renaissance Foundation-Kyiv (Ukraine)