This book, "Introduction to Maintenance Engineering" covers the fundamentals of Maintenance Engineering such as major causes of poor maintenance, objectives & benefits of maintenance, various strategies of maintenance like Preventive Maintenance, Total Productive Maintenance, Reliability Centered Maintenance and Condition Monitoring with case studies. Also the importance of Reliability, Availability and Maintainability. This book aims to make students/readers to feel and appreciate the essence of Maintenance Engineering. To achieve this, I paid adequate attention to presenting the subject in a simple and easy to understand way. Diagrams are simple and self-explanatory. I express my gratitude to all authors of various books, papers, Internet sites, and other literature which have been referred to in this book. Also much effort has been made to explain the concepts in a simple and easy to understand language. The book is organized in to 7 chapters. Adequate number of illustrations have been included in each chapter. I hope this book is useful to both students and teaching faculty.