The book "Molecular Physics and Elements of Quantum Chemistry" offers a comprehensive introduction to the modern developments in molecular physics and quantum chemistry. In this second edition, significant advancements in areas such as single-molecule spectroscopy and molecular electronics, which are undergoing rapid development, are addressed. The authors, Hermann Haken and Hans Christoph Wolf, have not only revised and expanded the existing content but also added new exercises to help students deepen their understanding and create a foundation for independent learning. Solutions to these exercises are available online, supporting the learning process. This textbook is aimed at students of physics, physical chemistry, and theoretical chemistry, and it assumes a basic knowledge of atomic and quantum physics.