ABSTRACT Objective of the research entitled Typology and Causes of Post Conflict Violence in Aceh (2005-2012) is to explain the characteristics and causes of post conflict violence in Aceh. Eventhough the separatist violence in Aceh has ended in 2005, but violent conflict in Aceh continues to increase and is often concentrated in the pre MoU conflict area. The term post-conflict can trap us into a common perception that the conflict has ended and replaced by peace, or to equate "conflict" to "war" and "postconflict" to "peace. In post-conflict situations, the intensity of the conflict is much reduced; the conflict also becomes less latent, but rarely stops at all. Post convlict violence in Aceh has different types. By using Chaudary and Suhrkes theories, researcher is trying to analyze these types of post conflict violence into four cathegories: political violence, routine state violence, economy crime-related violence, and community/ informal justice and policing violence. This typology will then help us to understand the causes of post conflict violence. In situations of war, actions of violence have been intitutionalized and it will not be easily stopped even after the peace agreement was signed. This typology will then help us to understand the causes of post conflict violence. Researcher is using Severine Autesserre to analyze the causes of violent conflict in Aceh. Autesserre divided the causes into two cathegories: war induced causes of violence, and peace induced causes of violence. The first helps us to understand the effect of war to post onflict environment. War has changed everything : education, informal skill, and ex combatants job. The lack of education and informal skills, has led to the criminal inertia actions by ex-GAM member. The lost of mutual trust between police enforcement and ex-GAM member also crates tension between both actors. The second cause is peace induced. If the war has changed the habits and behavior of the people of Aceh to the dominance of violence, the peace treaty seeks to change the behavior, attitudes and contradictions of actors involved by using Disarmament, Demobilization and Reintegration programs. Issues and problems began to emerge in the long term process of reintegration programs. Keywords: Post conflict violence, tipology, causes, Autesserre, Chaudary, Aceh, MoU.