This important Handbook is a comprehensive guide to the role, function and perceived impact of policy research-oriented institutions in North America, Europe and beyond. Over two-dozen international scholars explore the diverse and eclectic world of think tanks to reveal their structure, governance and unique position in occupying a critical space on the public policy landscape. This Handbook serves as a reference point for understanding how think tanks shape public opinion and public policy, and how their directors help them navigate their way through an increasingly crowded marketplace of ideas. It also considers how these organizations enlist various actors (such as policy makers, the media, donors and industry leaders) to influence the discourse around key domestic and foreign policy issues. Handbook on Think Tanks in Public Policy is an invaluable resource for academics and students who wish to further their understanding of how to measure the impact and reach of think tanks. It will also be useful for policymakers and NGOs who are interested in the expertise think tanks can offer on policy-related issues and to donors, whose main goals and objectives may be advanced by these organisations.