Introduction Ethics can be defined as the study of the characteristics of morals, and involves the moral choices made by individuals as they interact with other persons (Fleddermann, 2004). That means ethics is concerned with assessing what is right and wrong, good or bad, or just and unjust in daily life. Engineering ethics refers to the rules and standards governing the conduct of engineering in their roles as professionals (Fleddermann, 2004). The role of ethics in societies is very important because it is the basic beliefs and standards that make everything runs smoothly. Ethics are involved in all aspects of our daily activities from personal to professionals. So there is a big need for knowing and learning ethics since they guide our decisions and determine our future, and when ethics isn’t applied, the society will be full of crime, irresponsibility and dishonesty. This paper has these headings, ethical behaviors, the importance of ethics in mechanical engineering, ethical issues in mechanical engineering, and the conclusion. Ethical Behaviors Ethical behavior means doing things that consistent with what society and individuals typically think are good values .Examples of these behaviors, being honest which means to be away from lying and cheating people. Also integrity is important which means to do activities while acting ethically even when there is no personal advantage. Accuracy is an important behavior which defined as the act of working or performing without mistakes. Also, it is good to be respectful, referring to treating others with the most respect, regardless of positions, differences, ages or titles. Duty and responsibility that means all people must have a duty to be aware of the obligations imposed by laws and regulations. It is important to keep an open mind, open to new ideas, ask for opinions and accept critics. Protection and care, all members are responsible for protecting the society. Punctuality is