The Graduate Institute of International and Development Studies (French: Institut de hautes études internationales et du développement, abbreviated IHEID), commonly referred to as the Geneva Graduate Institute, is a graduate-level research university in Geneva, Switzerland dedicated to international relations, development studies, and global governance.

Founded in 1927 by two senior League of Nations officials, the Geneva Graduate Institute was the world's first graduate school dedicated solely to the study of international affairs. With Maison de la Paix acting as its primary seat of learning, the Institute's campuses are located blocks from the United Nations Office at Geneva, International Labour Organization, World Trade Organization, World Health Organization, International Committee of the Red Cross, World Intellectual Property Organization and many other international organisations.

Today, the institute enrolls around a thousand graduate students from over 100 countries, including nearly 90% of whom are foreign-born. It is officially a bilingual English-French institution, although most classes are in English. A member of the Association of Professional Schools of International Affairs, it runs joint degree programmes with Smith College and Yale University, and is Harvard Kennedy School's only partner institution to co-deliver double degrees.

The Institute maintains strong links with the League of Nations's successor, the United Nations, where many alumni have gone on to work, including one secretary-general, seven assistant secretaries-general, and three under-secretaries-general. Alumni have also served as director-general of the International Atomic Energy Agency, International Labour Organization, World Intellectual Property Organization, General Agreement on Tariffs and Trade, and as commissioner-general of the United Nations Relief and Works Agency and High Commissioner for Human Rights.