This thesis seeks to propose a cultural defence in international criminal law. Assuming that culture is at the basis of the normative sense of an agent, the defence allows her to use culture as an excuse for her criminal conduct. The possibility is analysed from both a procedural viewpoint, by reviewing both defences and culture in international law, and a moral standpoint, using sources from anthropology to contextualise the defence and clarify its role in the universalism/relativism debate.