We are delighted to present first edition of the book entitled “Introduction to Microbiology” for U.G Students who opted a keen interest in this subject. This book covers the basics microbiology which is first stair to graduates. This book provides the basic information in the various fields of microbiology, the History and developments, scope of microbiology, various systems of classification. It chronologically includes the chapters on viruses and their complex structures, bacteria and its types, structure and morphology, archaebacteria; their origin on the earth and the complication of their cell wall is well explained, fungi – its structure, types & economic importance, Phycology; its economic importance, Protozoology; diseases and their life cycles, microscopy, sterilization and isolation staining techniques in the field of microbiology are included in this book.