The United Nations Office for Sustainable Development (UNOSD) was established in 2011 by the United Nations and the Government of Republic of Korea (RoK). The purpose of UNOSD is to support governments in implementing international agreements on sustainable development, including Agenda 21, the Johannesburg Plan of Implementation, and outcomes of Rio+20. The Office is managed by the Division for Sustainable Development (DSD) of the United Nations Department of Economic and Social Affairs (UNDESA). UNOSD is supported by the Republic of Korea Ministry of Environment, Yonsei University and the City of Incheon.

The UNOSD promotes sustainable development through knowledge exchange, research and policy analysis, capacity development and partnerships.