The main focus of Slovenia’s international environmental co-operation has been on co-operative activities with neighbouring countries, particularly those in the Balkan region with which it shares ecosystems and water catchments. Slovenia has also taken several important initiatives under the Danube and Alpine conventions and in the Dinaric Arc area. It has a good record of honouring its commitments under the multilateral environmental agreements to which it is a party. This chapter reviews initiatives to promote sustainable development undertaken by Slovenia in bilateral, regional and multilateral contexts and evaluates their results. It also presents Slovenia’s progress in fulfilling international commitments made in trade and environment-related agreements. Finally, the environmental dimensions of the country’s newly established official development assistance programme are addressed.