The book "Variational Methods in Molecular Modeling" offers a comprehensive introduction to the application of variational methods in molecular modeling. It covers a wide range of topics, including the Gibbs-Bogoliubov-Feynman variational principle, classical density functional theories, and dynamic density functional theories. The authors, leading experts in their field, present illustrative examples that facilitate the understanding of fundamental concepts and enable quantitative predictions about the properties and behavior of complex many-body systems. These systems include inhomogeneous liquids, colloidal dispersions, liquid crystals, and high-temperature superconductors. The book places particular emphasis on physical understanding, making it accessible to students and researchers in the fields of materials science, chemistry, and applied mathematics, even without specific prior knowledge in theoretical physics or variational calculus.