The writings of the anarchist theorist Pierre-Joseph Proudhon (1890-1865) can be used to explore key concepts of order and formal organization within political systems and international relations as a whole. The International Political Theory of Pierre-Joseph Proudhon provides a methodologically rigorous, contextualised account of the first extensive socialist engagement with world politics in history, one drawn from an original reading of Proudhon#xE2;#xAC;"s un-translated French works. It looks at how anarchist theory can give a compelling alternative to current conceptions of world politics and international relations. The International Political Theory of Pierre-Joseph Proudhon will be of interest to scholars of social justice, political theory and international relations.