The Peterson Institute for International Economics (PIIE), known until 2006 as the Institute for International Economics (IIE), is an American think tank based in Washington, D.C. It was founded by C. Fred Bergsten in 1981 and has been led by Adam S. Posen since 2013. PIIE conducts research, provides policy recommendations, and publishes books and articles on a wide range of topics related to the US economy and international economics.

C. Fred Bergsten is an American economist, author, think tank entrepreneur, and policy adviser. He has served as assistant for international economic affairs to Henry Kissinger within the National Security Council and as assistant secretary for international affairs at the U.S. Department of the Treasury. He was the founding director of the Peterson Institute for International Economics, until 2006 the Institute for International Economics, which he established in 1981 and led through 2012. In addition to his academic work, he has been an influential public commentator and advisor to the American and global economic policy community, writing for influential periodicals such as Foreign Affairs magazine and by writing numerous books.