United Nations Office for the Coordination of Humanitarian Affairs

The United Nations Office for the Coordination of Humanitarian Affairs (OCHA) is a United Nations (UN) body formed in December 1991 by General Assembly Resolution 46/182. The resolution was designed to strengthen the UN's response to complex emergencies and natural disasters. Earlier UN organizations with similar tasks were the Department of Humanitarian Affairs (DHA), and its predecessor, the Office of the United Nations Disaster Relief Coordinator (UNDRC). In 1998, due to reorganization, DHA merged into OCHA and was designed to be the UN focal point on major disasters. It is a sitting observer of the United Nations Development Group.

After merging with the DHA, its mandate was expanded to encompass the coordination of humanitarian response, policy development and humanitarian advocacy. The agency's activities include organization and monitoring of humanitarian funding, as well as information exchange, coordination and rapid-response teams for emergency relief. Since 29 May 2015, OCHA is led by Stephen O'Brien as Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator (USG/ERC), appointed for a five-year term.

From 2013 to 2016, OCHA organized the World Humanitarian Summit that was held in Istanbul, Turkey, on May 23 and 24, 2016.

OCHA is headed by the Undersecretary-General for Humanitarian Affairs and Emergency Relief Coordinator, since 29 May 2015 by Stephen O'Brien. It has 2 headquarters in New York and Geneva, 8 regional offices, 32 field offices, 23 humanitarian adviser teams, and 3 liaison offices.