Daniel Horace Deudney (born March 9, 1953) is an American political scientist and Associate Professor of Political Science at Johns Hopkins University. His published work is mainly in the fields of international relations and political theory, with an emphasis on geopolitics and republicanism.
Deudney graduated from Yale University in 1975 with a BA in political science and philosophy. He holds an MPA in science, technology, and public policy from the George Washington University. In 1989, he graduated from Princeton University with an MA and PhD in political science.
During the late 1970s Deudney worked for three years as the senior legislative assistant for energy and environment and legislative director to Senator John Durkin (D-NH). During the early 1980s he was a senior researcher at the Worldwatch Institute in Washington D.C. He also consulted for the State and Defense departments, as well as the Central Intelligence Agency.
He has won several awards for teaching, including the Johns Hopkins University Alumni Association Excellence in Teaching Award in 2005, the George E. Owens Teaching Award in 2001, and Penn's Lindback Award for excellence in teaching in 1996.
His most recent book is Bounding Power: Republican Security Theory from the Polis to the Global Village. This book is revolutionary in its field, as Deudney seeks to carry out a profound critique of realism and liberalism. He argues that realism and liberalism are both fragments of a broader tradition of republican thought. In contrast to either realism or liberalism, republican political thought is focused on negotiating the space between anarchy and hierarchy. The book was reviewed in March/April 2007 issue of Foreign Affairs. It received the 2008 Robert Jervis and Paul Schroeder Award for the Best Book on International History and Politics, International History and Politics Section, American Political Science Association, and the 2010 ISA Book of the Decade Award in International Studies, International Studies Association.
Overall, Deudney remains a Liberal theorist, describing, in Bounding Power, Liberalism as "not the enemy of republican security theory, but its privileged...child". He believes the liberal democratic model will prevail in the world, and, while not believing in the triumphalism of Francis Fukuyama's thesis, paraphrases him, saying: "Liberal states should not assume that history has ended, but they can still be certain that it is on their side." 
- Deudney, Daniel (2007). Bounding power : republican security theory from the polis to the global village. Princeton: Princeton University Press. ISBN 0-691-11901-5.
- Deudney, Daniel; Richard A. Matthew (1999). Contested grounds: security and conflict in the new environmental politics. Albany, NY: State University of New York Press. ISBN 0-7914-4115-6.
- Deudney, Daniel (1983). Whole earth security : a geopolitics of peace. Washington, D.C.: Worldwatch Institute. ISBN 0-916468-54-2.
- Deudney, Daniel; Christopher Flavin (1983). Renewable energy : the power to choose. New York: W. W. Norton. ISBN 0-393-01710-9.
- Deudney, Daniel (1982). Space, the high frontier in perspective. Washington, D.C.: Worldwatch Institute. ISBN 0-916468-49-6.
- Deudney, Daniel (1981). Rivers of energy, the hydropower potential. Washington, D.C.: Worldwatch Institute. ISBN 0-916468-43-7.
- Deudney, Daniel (1989). Global geopolitics : a reconstruction, interpretation, and evaluation of materialist world order theories of the late nineteenth and early twentieth centuries (Ph.D. thesis). Princeton University. OCLC 22316596.
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- Deudney, Daniel. "Publius before Kant: Federal-Republican Security and Democratic Peace." European Journal of International Relations. London: Sep 2004. Vol.10, Iss. 3; p. 315
Other republican IR theorists:
- "JHU Department of Political Science Faculty Awards".
- Review in Foreign Affairs
- [Bounding Power: Republican Security Theory from the Polis to the Global Village, p. 15]
- [The Myth of the Autocratic Revival: Why Liberal Democracy Will Prevail. By Deudney, Daniel, Ikenberry, G. John, Foreign Affairs, Jan/Feb2009, Vol. 88, Issue 1]
- Theory Talks 2013 interview with Daniel Deudney
- Video of debate/discussion with Deudney and Michael Lind on Bloggingheads.tv
- Brewer, Katherine (2004-11-19). "Five Best Professors". The Johns Hopkins News-Letter.
- Nevils, Brooke (2006-10-19). "Things I've Learned: Prof. Deudney". The Johns Hopkins News-Letter.