Promoting lasting peace and security has been at the core of the OSCE’s work since its inception. Drawing on the OSCE’s long-standing experience in SouthEastern Europe, this reference guide provides insight into the organization’s activities to foster sustainable peace and democracy. Over 30 practical examples illustrate the work of OSCE field operations across seven thematic areas, outlining the good practices and lessons to be learned for future peacebuilding endeavours. Highlighting how the OSCE’s comprehensive approach to security can be practically applied in the field, this guide hopes to serve as a source of inspiration for OSCE officials, policy makers, practitioners, and civil society.