This handbook is designed as a stand-alone guide to thermoset resins, an important class of polymer materials. It begins with a general introduction to thermoset resins - including network concept, curing, processing, and testing - and ends with thermoset nanocomposites, a subject of much current interest. Its objective is to pre focused and detailed information on synthesis, characterizations, applications, and toughening of thermoset resins. In contrast to thermoplastics, where the toughening is achieved by simple physical blending, the same is achieved in thermoset resins exclusively through and presents a greater challenge to polymer scientists, as highlighted in this book. Handbook of Thermoset Resins also presents a detailed review of the recent advances on thermoset-based composites and nanocomposites. Finally, it highlights the future directions of research in various areas of thermoset resins. With such broad technical content, covering the basic concepts and recent advances, the book serves as both a useful textbook and as a handbook for students, researchers, engineers, R&D scientists from academia, research laboratories and industries (related to resins, fibre composites, adhesive, paints, rubbers, printing inks, and more). Scientists and researchers in the field of polymer science in general and thermoset resins in particular will find this book very useful in developing a knowledge-base in the subject as well as planning their future research works.