Ivo H. Daalder (born 1960, The Hague, Netherlands) has been the U.S. Permanent Representative on the Council of the North Atlantic Treaty Organization since May 2009. He is a specialist in European security. He was a member of the staff of United States National Security Council (NSC) during the administration of President Bill Clinton, and was one of the foreign policy advisers to President Barack Obama during his 2008 presidential campaign.

Daalder was educated at the University of Kent, Oxford University, and Georgetown University, and received his Ph.D in political science from the Massachusetts Institute of Technology. He was fellow at Harvard University's Center for Science and International Affairs and the International Institute for Strategic Studies in London. He received a Pew Faculty Fellowship in International Affairs and an International Affairs Fellowship of the Council on Foreign Relations. Daalder was an associate professor at the University of Maryland, College Park’s School of Public Affairs, where he was also director of research at the Center for International and Security Studies. He was a Senior Fellow in foreign policy studies at the Brookings Institution from 1997 to 2009, where he was a specialist in European security, transatlantic relations, and national security affairs.