Mechanics of porous media is the study of porous materials whose mechanical behaviour is significantly influenced by the pore fluid. This handout is devoted to the theory of deformation, strength, flow and multiphase coupling in porous media. The mechanics of porous media theory has become very important for many applications mainly because of the increase of human influence on the environment. Mechanics of porous media play an important role in many branches of engineering, including material science, biomechanics and the petroleum industry, as well as in (geo-) mechanics. The creation of grandiose constructions, intensification of oil recovery by enhancement of reservoir permeability and by changes of fluid compositions, construction of deep mines and super deep wells, preservation of rock bursts, earthquake prediction problems and many aspects of geodynamics, earthquake engineering, seismic exploration, underground explosion works, problems of underground storage of gas and of environment protection against pollution – all need the basic concepts of mechanics of porous media. Many problems of chemical technology, powder metallurgy, etc., are close to the themes mentioned above. The objective of this interdisciplinary course is to formulate realistic analysis of the behaviour of multiphase porous material (solid, miscible and immiscible fluids) submitted to multiphysics phenomena (mechanics, hydraulic and thermal). Here the main attention is devoted to the formulation of basic physical concepts of deformation and flow processes and of their presentation in the form of continuum equations.