The subject “Engineering Geology and Rock Mechanics” has recently been introduced in several universities at the undergraduate level. The civil engineers are equally interested in soils and rocks, in their formations, and also in their properties for civil engineering design and construction.The scope of the course content has been dealt with in such a way that the postgraduate students can also find many useful matters of their interest. The book deals with the formation of rocks and soils, the classification of soils and rocks, rock mass classification system. As the book advances, it deals with the stresses in rock mass, strength and deformability characteristics of rock masses, discontinuities in rock masses besides testing and characterization of rock mass in the field as well as in laboratory. Further the civil engineering problems connected with soils and rocks such as landslides, rock slides, mudflow, earthquakes etc. and foundations on rock have also been discussed.