Joseph Eugene Stiglitz (/ˈstɪɡlɪts/; born February 9, 1943) is an American New Keynesian economist, a public policy analyst, political activist, and a professor at Columbia University. He is a recipient of the Nobel Memorial Prize in Economic Sciences (2001) and the John Bates Clark Medal (1979). He is a former senior vice president and chief economist of the World Bank. He is also a former member and chairman of the U.S. Council of Economic Advisers. He is known for his support for the Georgist public finance theory and for his critical view of the management of globalization, of laissez-faire economists (whom he calls "free-market fundamentalists"), and of international institutions such as the International Monetary Fund and the World Bank.

In 2000, Stiglitz founded the Initiative for Policy Dialogue (IPD), a think tank on international development based at Columbia University. He has been a member of the Columbia faculty since 2001 and received the university's highest academic rank (university professor) in 2003. He was the founding chair of the university's Committee on Global Thought. He also chairs the University of Manchester's Brooks World Poverty Institute. He was a member of the Pontifical Academy of Social Sciences. In 2009, the President of the United Nations General Assembly Miguel d'Escoto Brockmann, appointed Stiglitz as the chairman of the U.N. Commission on Reforms of the International Monetary and Financial System, where he oversaw suggested proposals and commissioned a report on reforming the international monetary and financial system. He served as the chair of the international Commission on the Measurement of Economic Performance and Social Progress, appointed by the French President Sarkozy, which issued its report in 2010, Mismeasuring our Lives: Why GDP doesn't add up, and currently serves as co-chair of its successor, the High Level Expert Group on the Measurement of Economic Performance and Social Progress. From 2011 to 2014, Stiglitz was the president of the International Economic Association (IEA). He presided over the organization of the IEA triennial world congress held near the Dead Sea in Jordan in June 2014.

In 2011, Stiglitz was named as one of the 100 most influential people in the world by Time magazine. Stiglitz's work focuses on income distribution from a Georgist perspective, asset risk management, corporate governance, and international trade. He is the author of several books, the latest being The Road to Freedom (2024); People, Power, and Profits (2019); The Euro: How a Common Currency Threatens the Future of Europe (2016); The Great Divide: Unequal Societies and What We Can Do About Them (2015); Rewriting the Rules of the American Economy: An Agenda for Growth and Shared Prosperity (2015); and Creating a Learning Society: A New Approach to Growth Development and Social Progress (2014). He is also one of the 25 leading figures on the Information and Democracy Commission launched by Reporters Without Borders. According to the Open Syllabus Project, Stiglitz is the fifth most frequently cited author on college syllabi for economics courses.

Stiglitz was born in Gary, Indiana into a Jewish family. His mother was Charlotte (née Fishman), a schoolteacher, and his father was Nathaniel David Stiglitz, an insurance salesman. Stiglitz attended Amherst College, where he was a National Merit Scholar, active on the debate team, and president of the student government. During his senior year at Amherst College, he studied at the Massachusetts Institute of Technology (MIT), where he later pursued graduate work. In Summer 1965, he moved to the University of Chicago to do research under Hirofumi Uzawa who had received an NSF grant. He studied for his PhD from MIT from 1966 to 1967, during which time he also held an MIT assistant professorship. Stiglitz stated that the particular style of MIT economics suited him well, describing it as "simple and concrete models, directed at answering important and relevant questions."

From 1966 to 1970 he was a research fellow at the University of Cambridge. Stiglitz initially arrived at Fitzwilliam College, Cambridge as a Fulbright Scholar in 1965, and he later won a Tapp Junior Research Fellowship at Gonville and Caius College, Cambridge which was instrumental in shaping his understanding of Keynes and macroeconomic theory. In subsequent years, he held academic positions at Yale, Stanford, Oxford—where he was Drummond Professor of Political Economy—and Princeton. Since 2001, Stiglitz has been a professor at Columbia University, with appointments at the Business School, the Department of Economics and the School of International and Public Affairs (SIPA), and is an editor of The Economists' Voice journal with J. Bradford DeLong and Aaron Edlin.

He teaches classes for a double-degree program between Sciences Po Paris and École Polytechnique in Economics and Public Policy. He has chaired the Brooks World Poverty Institute at the University of Manchester since 2005. Stiglitz is widely considered a New-Keynesian economist, although at least one economics journalist says his work cannot be so clearly categorized.

Stiglitz has played a number of policy roles throughout his career. He served in the Clinton administration as the chair of the President's Council of Economic Advisers (1995–1997). At the World Bank, he served as a senior vice-president and the chief economist from 1997 to 2000. He was fired by the World Bank for expressing dissent with its policies. Stiglitz has advised American president Barack Obama, but has criticized the Obama Administration's financial-industry rescue plan. He said whoever designed the Obama administration's bank rescue plan is "either in the pocket of the banks or they're incompetent."

In October 2008, he was asked by the President of the United Nations General Assembly to chair a commission drafting a report on the reasons for and solutions to the 2008 financial crisis. In response, the commission produced the Stiglitz Report.