This text on gravity methods in geophysics is intended for students and earth scientists of all kinds e.g., geophysicists, geologists, and geodesists. It is structured in 7 chapters covering the basic problems and tasks: data acquisition and analysis; qualitative and quantitative geological interpretation aspects involving the basic theory of gravitation and its potential; methods of integration to solve "forward problems", and the theory of Bayesian inversion with a priori information offering many means of evaluating the results. The ideas are illustrated and documented by many practical examples on scales, from the search of cavities to global geodynamics. Tasks or problems (with solutions) for students to solve are included, plus a guide to related texts and a subject index.