This book, Functional Materials Based on or Derived from Coordination Compounds for a Sustainable Society, compiles pioneering research that highlights the critical role these materials play in advancing sustainability and addressing ecological concerns. The key focus of this book is the development and application of functional materials that contribute to a green environment. These topics emphasize the critical role of functional materials in advancing sustainability, energy efficiency, and environmental protection, and highlight innovative research in various areas. As we confront the urgent need to create a more sustainable world, the research presented in this book serves as both a guide and an inspiration. It demonstrates the immense potential of functional materials to address environmental issues while advancing technological progress. We hope that this collection will spark further research, collaboration, and innovation in the quest for a greener, more sustainable future.