Since 1989, the threat of nuclear war has receded and so has the threat of large-scale interstate conventional war. Yet during the 1990s millions have died in wars in Africa, Eastern Europe and elsewhere and millions more have become refugees or displaced persons. In this pathbreaking analysis, Mary Kaldor argues that, in the context of globalization, what we think of as war - that is to say, war between states in which the aim is to inflict maximum violence - is becoming an anachronism. In its place is a new type of organized violence, which she calls new wars, which could be described as a mixture of war, organized crime and massive violations of human rights. The actors are both global and local, public and private. The wars are fought for particularistic political goals using tactics of terror and destabilization that are theoretically outlawed by the rules of modern warfare. An informal criminalized economy is built into the functioning of the new wars. Political leaders and international institutions have been helpless in the face of the spread of these wars mainly because they have not come to terms with their logic; the new wars are treated either as old wars or else as anarchy. Kaldor's analysis offers a basis for a cosmopolitan political response to these wars, in which the monopoly of legitimate organized violence is reconstructed on a transnational basis and international peacekeeping is reconceptualized as cosmopolitan law enforcement. This approach also has implications for the reconstruction of civil society, political institutions, and economic and social relations. New and Old Wars will be of great interest to students of international relations, politics and political thought as well as to all those interested in the changing nature and prospect of warfare.