The Regional Environmental Center for Central and Eastern Europe (REC) is an international organisation with a mission to assist in solving environmental problems. The Center fulfils this mission by promoting cooperation among governments, non-governmental organisations, businesses and other environmental stakeholders, and by supporting the free exchange of information and public participation in environmental decision making.

The REC was established in 1990 by the United States, the European Commission and Hungary. Today, the REC is legally based on a Charter signed by the governments of 29 countries and the European Commission. The REC has its head office in Szentendre, Hungary, and country offices and field offices in 17 beneficiary countries, which are: Albania, Bosnia and Herzegovina, Bulgaria, Croatia, the Czech Republic, Estonia, Hungary, Latvia, Lithuania, the former Yugoslav Republic of Macedonia, Montenegro, Poland, Romania, Serbia, Slovakia, Slovenia and Turkey.

The REC actively participates in key global, regional and local processes and contributes to environmental and sustainability solutions within and beyond its country office network, transferring transitional knowledge and experience to countries and regions.

Recent donors are the European Commission and the governments of Albania, Austria, Belgium, Bosnia and Herzegovina, Bulgaria, Canada, Croatia, the Czech Republic, Estonia, Finland, Germany, Hungary, Italy, Japan, Latvia, Lithuania, Luxembourg, the former Yugoslav Republic of Macedonia, Montenegro, The Netherlands, Norway, Poland, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, the United Kingdom, and the United States, as well as other inter-governmental and private institutions.

The REC CO Croatia has existed in Croatia since 1993. According to the Law on Associations, which was passed in 1997 the REC is registered as a foreign non-governmental organisation. The CO Croatia contributes to the REC overall mission by ensuring local presence, providing the REC programs that serve the local needs, assuring local access to REC services and assuring that the local view is taken into account in all REC programs.