Think Tanks Linked to by the US Department of State
On their website, the Department of State provides a list of think tanks that are involved in foreign policy research. I would recommend you start with this page to identify relevant think tanks if this will be relevant to your simulation and policy brief: Related Sites/Think Tanks on the Department of State website.
For More Directories to Think Tanks
Select Think Tanks, Research Institutes, & Advocacy Groups
Note: Some of the following are advocacy groups and will not always explicitly identify themselves as such. Cato, the American Enterprise Institute, and the Heritage Foundation run on the conservative side, for example; to counter, the Center for American Progress and the Economic Policy Institute are usually identified as liberal.
For a quick run-through of popular think tanks on the political spectrum, you can refer to this New York Time's Idea of the Day blog post that provides information on asset amounts, areas of research, political orientation, and their rating based on the University of Pennsylvania's Think Tank and Civil Societies Program (TTCSP).
Below is a list of some prominent think tanks involved in foreign policy research. For more, please visit the US Department of State's website.
Identify relevant NGOs with the following NGO directories: