The book "Defect and Material Mechanics" provides a comprehensive overview of the latest developments in the theory of defects and the mechanics of material forces. Most contributions come from experts who presented at the International Symposium on Defects and Material Forces. The mechanics of material forces, based on the work of Eshelby, provides a rational framework for describing the driving forces on evolving inhomogeneities and structural changes in continuous media. The general Eshelbian mechanics offers a unified treatment of various phenomena, including fracture and damage development, phase transitions, plasticity, and dislocation movement. The articles in this volume address both theoretical and computational aspects of the material mechanics of defects and cover a wide range of topics relevant to professionals in this field.