This article explores the extent to which the decision to invade Iraq in 2003 coheres with the normative precepts of liberalism as an international political theory. Beginning with a Lockean liberal theory of the state, this article first examines the evolution of international liberalism in order to identify the fundamental normative postulates of liberal theory as it pertains to international relations, especially regarding the use of military force. The article then advances two interrelated arguments: First, that the underpinnings of the (...) decision to invade Iraq embodied in the Bush Doctrine draw heavily from the liberal tradition, though still depart from it in important ways. Second, that the Bush Doctrine as manifested in the Iraq war reflects in many ways the liberal thinking that prevailed during the interwar years and is therefore susceptible to a similar charge of ‘utopianism’ that was leveled against interwar liberalism by E. H. Carr in his Twenty Years' Crisis. (shrink)