The present book entitled "Inorganic Chemistry-I", is an effort to present subject matter in a readable and easily understandable form. This textbook is intended for the postgraduate Inorganic Chemistry first semester course and it covers all the topics on bonding, stability of metal complexes, clusters, metal carbonyls, metal nitrosyls, dinitrogen and dioxygen compounds, phosphines, isopoly acids and heteropoly acids. The text book is divided into five chapters comprising detailed description of stereochemistry and bonding in main group compounds, compounds of boron, carbon and nitrogen with metals, metal-ligand equilibria in solution, metal p-acid complexes, cluster compounds and polyoxometalates. This book is written in a simple language and I hope that it will be useful for students, researchers and teachers. The book covers the syllabus of M.Sc. Course in Chemistry of different Universities of Uttarakhand and other states/Central Universities of India. Figures, tables and equations are used at appropriate positions to explain various aspects in a simple and systematic way to understand complex relationships, patterns and trends clearly and concisely.