This concise treatment embraces, in four parts, all the main concepts of theoretical physics: Mechanics and Basic Relativity; Electrodynamics and Aspects of Optics; Non-relativistic Quantum Mechanics; and Thermodynamics and Statistical Physics. It thus serves both as an excellent review and preparation tool, and as a convenient reference source, covering the whole of theoretical physics. It may also be successfully employed to deepen readers' insight and add new dimensions to their understanding of these fundamental concepts. Recent topics such as holography and quantum cryptography are included, thus making this a unique contribution to the learning material for theoretical physics.