This book first published in 1970 and running into its Seventeenth Edition, has been thoroughly revised, updated and enlarged. The book, devided into Eight Parts, contain Thirty Four Chapters. This book is intended to present currently accepted theories, design principles and practices of soil mechanics and foundations engineering. The book provides sufficient material ranging from simple to very complex for undergraduate and postgraduate course. At the end of each chapter, latest problems from various central competitive examinations has been solved to enable the student to test his reading at different stages of his studies.