The European Peacebuilding Liaison Office (EPLO) based in Brussels, Belgium, lists all jobs and internships of their member organizations on one page of their site. For anyone interested in working internationally (some of their positions are based in Asia or Africa as well as Europe), this can be a great resource. As of today, they are listing positions in mediation in Tripoli, conflict resolution in Sub-Saharan Africa, program officer in Nepal, development officer in Brussels, communications officer in Abidjan, and more.
Center for Intercultural Dialogue 