This article examines education as a security issue in Bosnia and Herzegovina (BiH), where some Bosniaks, Serbs and Croats have learned to hate each other and, at times, violently reinforce ethno-cultural differences through separate education systems. It further explores education as a poorly understood conflict-prevention, post-war reconstruction and peacebuilding tool mainly after the 1995 Dayton Accord. It highlights the OSCE as a significant actor in recognizing and responding to education-related security needs. And it reflects on persistent challenges and prospects for a sustainable peace aided by education. Finally the article identifies new research steps to assess reforms.