This book analyzes peacebuilding operations in Southeast Asia, focusing on socio-economic improvement for conflict resolutions. Peacebuilding in Southeast Asia always faces dilemmas between development imperatives and the non-interference principle because of the authoritarian regimes. This book has an attempt to disclose difficulties and challenges of peacebuilding in the region based on the concept of human security. The idea of peacebuilding, which is criticized as insensitive towards the local, emerged as the basis of a universal vision of peace and development. Tensions between international peacebuilding actors and local stakeholders go far deeper than mere problems of coordination in operation. Peacebuilding in Southeast Asia faces most serious situations because conflicts in the region was originally influenced by a negative legacy of the colonial age and the colonial suzerainty forcibly separated their identity and ethnic network. Besides, their authoritarian resist being interfered by outside peacebuilding actors.