Kalypso Nicolaïdis (Greek: Καλυψώ Νικολαΐδη) is a French-Greek academic, currently Professor of International Relations and Director of the Center for International Studies at Oxford University, England. She teaches in the areas of European integration, international relations, international political economy, negotiation and game theory and research methods as University Lecturer in the Department of Politics and International Relations. In 2020, Nicolaïdis joined the School of Transnational Governance at the European University Institute as a full time professor.