Sir Mark Andrew Lowcock KCB (born 25 July 1962) is a British economist and accountant who served as the United Nations Under-Secretary-General for Humanitarian Affairs and Emergency Relief Coordinator (the head of the United Nations Office for the Coordination of Humanitarian Affairs) between 2017 and 2021. Prior to his appointment by United Nations Secretary-General António Guterres on 12 May 2017, Lowcock was the Permanent Secretary of the Department for International Development (DFID) from June 2011 to September 2017. He is currently a visiting professor in practice at the Department of International Development at the London School of Economics and Distinguished Non-Resident Fellow at the Center for Global Development in Washington, DC. He is also a Trustee/Director of The Howard Part