This book underscores the idea of harnessing the sustainable designs and materials in nature and integrating them into the field of engineering to design innovative materials and structures with multifunctional properties targeting defense, automotive, aerospace, electronics, nuclear, healthcare, energy, sports, packaging, etc. to offer improved safety, reliability, performance, durability, sustainability, and functionality. The concept of sustainability involves the understanding of how nature has evolved solutions to various challenges over millions of years and applying these principles to design innovative materials and structures with multifunctional properties. This book provides a thorough examination of the methods and techniques used in developing sustainable materials and structures, highlighting their potential for multifunctional applications. The book delves into the expansion of our understanding in this field, which is accompanied by novel synthesis and processing methods. These methods and techniques incorporate sustainable strategies, to create innovative materials and systems to offer a wide range of properties and functions, making them highly attractive for various applications in different fields of advanced technology. In addition, these materials and structures can be tailored to have specific properties and functions, such as self-healing capabilities, high strength-to-weight ratios, and enhanced energy absorption which are the prime requirements for the researchers looking for lightweight materials and structures.