Internal Combustion Engine Fundamentals is a comprehensive book for undergraduate students of Mechanical Engineering. The book comprises chapters on engine types and their operations, thermo chemistry of fuel-air mixtures, properties of working fluids, gas exchange processes, pollutant formation and control, engine heat transfer, and engine operating characteristics. In addition, the book consists of several diagrams and illustrations to understand the concepts better. This book is essential for mechanical engineers preparing for competitive examinations like GATE and IES.