Organic Chemistry: An Introductory Course is an introductory textbook that covers the significant developments in organic chemistry. This book is composed of 20 chapters that particularly focus on the basic, physico-chemical principles and reactions. The first 10 chapters explore the classification, physico-chemical properties, analysis, and reactions of numerous organic compounds, including aliphatic compounds, aldehydes, alcohols, esters, ethers, and acid derivatives. The subsequent three chapters describe the optical activity, stereoisomerism, biological significance, and industrial applications of these group compounds. Other chapters deal with the reactions and applications of other organic compounds, such as aromatic, nitro, phenol, benzaldehyde, and benzoic acid. The remaining two chapters emphasize the determination of molecular and structural formula of organic compounds. This book is of value to undergraduate organic chemistry students with advanced level course.