Top 25 U.S. Think Tanks 1. Brookings Institution 2. Council on Foreign Relations 3. Carnegie Endowment for International Peace 4. Rand Corporation 5. Heritage Foundation 6. Woodrow Wilson International Center for Scholars 7. Center for Strategic and International Studies 8. American Enterprise Institute 9. Cato Institute 10. Hoover Institution 11. Human Rights Watch 12. Peterson Institute for International Economics 13. Unites States Institute of Peace 14. National Bureau of Economic Research 15. Center for Global Development 16. World Policy Institute 17. Center for American Progress 18. Carter Center 19. Hudson Institute 20. Urban Institute 21. EastWest Institute 22. New America Foundation 23. Manhattan Institute 24. Resources for the Future 25. Baker Institute for Public Policy