Terrorist acts have, for a long time, constituted a major concern for the international community. Yet the definition of terrorism has represented an area of international law where the divergence of views between States was significant. For some, the protection of the State and of the democratic values of the society laid at the heart of the debate, whereas others were more concerned with the risk of an unjustified repression of “freedom fighters.” These approaches, although apparently complementary, have proved to be irreconcilable in practice. At the United Nations’ level, this division of the international community prevented the emergence of a consensus over a horizontal definition of terrorism. This situation,-paradoxically did not impede the adoption of several international conventions dealing with specific aspects or forms of terrorism as well as of multiple resolutions on this issue.