D oeS "soft power" matter in international relations? Specifically, when the United States seeks cooperation from countries around the world, do the views of their publics about US foreign policy affect the actual foreign policy behavior of those countries? we examine this question using multinational surveys covering fifty-eight countries, combined with information about their foreign policy decisions in 2003, a critical year for the US during the post-9/11 period.we draw our basic conceptual framework from joseph nye, who coined the term "soft power." 1 according to nye, soft power is "the ability to get what you want through attraction rather than coercion or payments." 2 this is an especially appropriate framework for us because, as nye puts it, "soft power is about mobilizing cooperation from others." 3 as we do in this article, he frequently uses public opinion surveys regarding attitudes in foreign countries toward the US and its policies. 4 It is also appropriate because the effectiveness of soft power hinges on the targeted country's public attitudes (that is, favorability) toward the country wielding, or attempting to wield, international influence (in this study, the US). *earlier versions of this article were presented at the United States Study centre (ussc), University of Sydney, on august 11, 2009; the center on Public Diplomacy, University of Southern california, on january 29, 2010; and the School of International relations and Pacific Studies, University of california, San Diego, on february 2, 2010. we thank nick cull, ellis krauss, Graeme Gill, Murray Goot, Simon jackman, Brendon o'connor, Shirley Scott, fred teiwes, other seminar participants, and the anonymous reviewers for useful comments. we are grateful to the ussc for funding through the 2009 research grants program and to takashi Inoguchi and emma thomas for providing parts of the data for analysis. for very capable research assistance, we thank weilin chiu, william courcier, robert flawith, keira Glasgow, and jens hansen-Ölmedal.