The conflict in the former Yugoslavia was characterised by extensive war crimes committed by all parties in the conflict. Two international courts, The International Court of Justice and the International Criminal Tribunal for the Former Yugoslavia, have both judged if a genocide was committed in this conflict. This paper examines how these two courts relates to each other concerning their legal judgement of the crime of genocide. Two cases are analysed; the judgement of Radislav Krstic´ at the ICTY and the case Bosnia and Hercegovina v. Serbia and Montenegro at the ICJ.