Since the end of the Cold War, advanced democracies have enacted explicit strategies of democracy promotion by providing assistance to governments, political parties, and other non-governmental groups and organizations all over the world. This paper examines the factors shaping European Union democracy aid allocation decisions from 1990-2010, weighing the relative impact of ideational concerns (regime type, human rights) and self-interests (political, security, economic). We argue that EU democracy aid reflects a "democracysecurity dilemma" as the EU balances ideational reasons for promoting democracy with concerns over political and economic relationships, regional stability, and security. We test our hypotheses with a series of random effects, generalized least squares and Heckman selection models, which provide support for our argument. The paper concludes with a discussion of the implications of these findings for the impact and explanation of EU democracy promotion policies.selectively: some otherwise similar states receive substantial commitments of democracy aid while others receive little or none. How do aid allocators decide where to commit democracy assistance?To explain the distribution of democracy aid, we argue that donors face a democracysecurity dilemma: ideational reasons for promoting democracy are weighed against political, economic, and security/stability interests, all of which may be threatened by democratization. Not only do some potential democracy aid recipients have relationships and preexisting agreements with donors that advance donor security interests, but situational factors related to recipient political context, conflict, and other matters also influence the desirability, efficacy, and potential consequences of democracy aid. In practice, efforts to promote democratization, develop and sustain friendly neighbors and neighborhoods, build security, and maintain stability are at times at odds. We argue that this dilemma, and its balancing, help to account for the patterns of democracy aid distribution.To test our democracy-security dilemma argument, we examine global European Union (EU) democracy aid allocations from 1990-2010 to examine the democracy-security dilemma and its effects on EU democracy assistance. 3 Specifically, we ask: How has the EU translated the democracy-security dilemma in the practice of democracy aid globally in the 1990-2010 period? Our focus is on EU assistance, not aid from individual EU member states, which is justified for a variety of reasons. Not only is the EU a significant player in global democracy promotion, 4 but EU aid is separate from the foreign aid budgets and decisions of member states. The European Commission is in charge of EU foreign aid: foreign aid priorities and packages are determined by the Commission's Directorate-General for International Cooperation and Development and aid policy-making at the Commission-level is separate from that of member states. 5 Finally, EU democracy aid represents a "hard test" of our democracy-security dilemm...