The Carnegie Endowment for International Peace (CEIP) is a nonpartisan international affairs think tank headquartered in Washington, D.C., with operations in Europe, South and East Asia, and the Middle East as well as the United States. Founded in 1910 by Andrew Carnegie, the organization describes itself as being dedicated to advancing cooperation between countries, reducing global conflict, and promoting active international engagement between the United States and countries around the world. It engages leaders from multiple sectors and across the political spectrum.

A think tank, or policy institute, is a research institute that performs research and advocacy concerning topics such as social policy, political strategy, economics, military, technology, and culture. Most think tanks are non-governmental organizations, but some are semi-autonomous agencies within government, and some are associated with particular political parties, businesses or the military. Think tanks are often funded by individual donations, with many also accepting government grants.