William D. Hartung (born 7 June 1955) is director of the Arms and Security Project at the Center for International Policy. He has also served as a Senior Research Fellow in the New America Foundation's American Strategy Program, and is former director of the Arms Trade Resource Center at the World Policy Institute. He specializes in issues of weapons proliferation, the economics of military spending, and alternative approaches to national security strategy. Hartung was the director of the Arms and Security Initiative at the New America Foundation. Prior to that, he served as the director of the Arms Trade Resource Center at the World Policy Institute. He also worked as a speechwriter and policy analyst for New York State Attorney General Robert Abrams