This manual provides the resources and tools for organizations and practitioners in post-conflict settings to sustainably engage men in gender-based violence prevention through Living Peace groups. The methodology is based on best practices with male social group-therapy programs and gender transformative group educational programs developed by Pro- mundo, which have been assessed in numerous impact evaluation studies around the world. This particular manual is based on formative research and baseline studies that Promundo conducted with local partners in Burundi and the Democratic Republic of Congo beginning in 2012. Three curricula were developed, implemented and tested in Goma, DRC (with HEAL Africa and the Institut Superieur du Lac for Mental Health Professionals), in Burundi (with CARE Burundi) and in Luvungi, DRC (with Women for Women International). In total, 27 Living Peace groups were implemented over 10 to 15 weeks, with 324 men, and in some cases, their female partners.