In civil Engineering practice, engineering geology plays a vital role. For an efficient and appropriate judgement in the analysis and analysis and execution of any project, is extremely essential not only to have a basic understanding of the geological processes and products at the site to select the best site based on an integrated site evaluation approach but also for the ground reinforcement at the site to with and the constructions whether it be dam, tunnel, transportation routes in problematic, watershed management and groundwater development are primarily based on the site geology and aquifer evolution. Thus Engineering Geology is an interface area of Civil Engineering and Geology. It has gained acceptability world over as a branch of Civil Engineering. Keeping this in mind, the present book is designed by the author based on his vast experience spanning about decades, as a basic first course, in particular, to the students of Civil Engineering. The contents of the book are dealt under eleven chapters. The first four chapters deal with the Geological Processes and Products with an emphasis on Civil Engineering needs. The next seven chapters deal with geological considerations in site evaluation, ground improvement, effect of geological features on the choice and construction methodology, groundwater hydrogeology, prevention or protection from geological hazards and role of geology in the environmental problems. At every stage in the book enough Indian examples are cited to enable a good comprehension of the subject by the reader.