This textbook is designed for a one-year (two semesters) graduate course on condensed matter physics for students in physics, materials science, solid state chemistry, and electrical engineering. It can also be used as a one-semester course for advanced undergraduate majors in physics, materials science, chemistry, and electrical engineering, and another one-semester course for graduate students in these areas. The book assumes a working knowledge of quantum mechanics, statistical mechanics, electricity and magnetism, and Green’s function formalism (for the second-semester curriculum). The book is written as a two-semester graduate-level textbook, but it can also be used as a reference book by faculty and other researchers actively engaged in research in condensed matter physics. With judicious choice of topics, the book can be divided into two parts: “Fundamental Concepts” designed to be taught in the first semester, and “Research Applications” to be taught in the second semester. Obviously, the first part can be taught to advanced undergraduate majors as an introductory course.