This book is based on the 50+ years experience of the author in the Power and Distribution Transformer industry. The first few chapters of the book give "step by step" procedures of designing a transformer. Engineers without prior knowledge or exposure to design can follow the procedures and calculation methods to acquire reasonable proficiency of designing a transformer. Though transformer is a mature product, the engineers working in the industry need to understand the fundamentals of the product and design to enable them to offer products to meet the challenging demands from the power system and the customer. This book can function as a useful guide for the practicing engineers to undertake new designs, cost optimization, design automation etc., without the need for external help or consultancy. The book extensively covers the design processes with necessary data and calculations of a wide variety of transformers including Dry Type Cast Resin Transformer, Amorphous Core Transformer, Earthing Transformer, Rectifier Transformer, Auto Transformer, Transformers for Explosive Atmosphere, Solid State Transformer etc. The other subjects covered include, Carbon Footprint Calculation of Transformers, Condition Monitoring of Transformers and Design Optimization Techniques. In addition to the Transformer industry, this book is useful to the Power Utility Engineers, Consultants, Research Scholars and Teaching faculty of Universities.