This book is the fruition of four decades of teaching Mechanical Engineering subjects including Quality Engineering, Total Quality Management, and Principles of Management for the Bachelor and Master degree courses in Engineering at Annamalai University, and then in Arunai Engineering College, Tiruvannamalai, by the author. Frank and continual feed back from the distinguished students and esteemed colleagues of the author obtained during teaching, enthused him in shaping this book into a valuable present to the scholars pursuing engineering.This book amply covers the updated syllabus of Professional Ethics by Anna University. Besides the basic human values, Codes of ethics of major Indian professional societies, detailed risk analysis with illustrative examples are included. Further, twenty four crisp case studies covering a wide spectrum of topics in Professional Ethics, short-answer questions, long-answer questions with hints have been appended to sustain the interest of the engineering students. Besides the prescribed syllabus, ethics-related topics such as Social Acceptability SA 8000, Safety System OHSAS 18001 and Engineer-Manager interactions have also been explained. The student community as well as the teaching fraternity is certain to enjoy using this book, not only from the teaching-learning point of view, but also for their professional career and advancement.