Colombia internal conflict between paramilitary armies and the central government is a topic that has been studied widely from different perspectives, including, but not limited to, studies on forced disappearance, internal displacement, the war on drugs, and the incidence of United States in Colombian internal warfare (Richani, 2013; Acemoglu et al., 2013; Aviléz, 2006; Dube & Naidu, 2015). By contrast, 2005 peace process between Colombian government and illegal paramilitary armies grouped under the umbrella organization named United Self-defense Forces of Colombia (AUC), has not been addressed with the same dedication. The objective of the present research is to analyze the 2005 Colombian peace-settlement through the scope of jus post bellum theory, aiming to see the possible deviations of the peace process from a just war theory moral perspective. According to jus post bellum theorist, a just peace-settlement can help to avoid repetition, while an unjust one can derive into new confrontation (Bell, 2013; Turner Johnson, 2012; Philpott, 2010). By achieving this goal this project intends to provide an ethical reflection on the course of action followed in Colombia to finish war with the self-defense armies, and to enrich Colombian debate about peace policy making in a time when the government is now negotiating a new peace settlement with FARC guerrilla.