Crystal Field Theory is an extensive topic of Inorganic Chemistry that can look scary at first glance. The motivation of writing the book on crystal field theory is that many textbooks does not covers all different types of important geometries merely ends with few common examples. We have made this textbook concise and have given a systematic effort to understand crystal field splitting of different geometries of metal complexes. Throughout the textbook, we have used numerous examples as a purpose of helping students to understand the concepts. This book will help students to improve their grip and confidence on Crystal Field Theory.