"Advanced Quantum Mechanics" by Franz Schwabl is the second volume on quantum mechanics and covers complex topics such as non-relativistic many-particle systems, relativistic wave functions, and relativistic quantum fields. The author is known for his comprehensive mathematical discussions, where all intermediate steps are derived. Numerous application examples and exercises support readers in gaining a solid understanding of the subject. The topics addressed form the foundation for further studies in solid-state physics, nuclear physics, and particle physics. This work complements and expands Schwabl's introductory book on quantum mechanics, which deals with non-relativistic quantum mechanics and provides a brief treatment of the quantization of the radiation field. The fourth edition has been thoroughly revised and includes new material, while the layout of the figures has been standardized to facilitate understanding.