The book "Self-Organizing Systems" offers a comprehensive collection of research findings derived from the contributions of the 7th IFIP TC 6 International Workshop on Self-Organizing Systems, IWSOS 2013. This conference took place in May 2013 in Palma de Mallorca, Spain, and brought together experts in the field of self-organizing systems. The carefully selected 11 full papers and 9 short contributions cover a wide range of topics, including the design and analysis of self-organizing and self-managing systems, as well as inspiring models of self-organization in nature and society. The topics addressed range from the structure and dynamics of self-organizing networks to self-organized social computations and communication systems. This book is a valuable resource for researchers and practitioners dealing with the theoretical and practical aspects of self-organizing systems.