Fundamental principles of freedom of commerce and industry give rise to the freedom of competition. However, this freedom may sometimes cause unfair commercial practices between companies. Despite differences, all countries in Europe have set up mechanisms based on the principle of fairness in order to better facilitate activities related to commerce. It is generally believed that the market should act in a fair way towards the interests of all participants and, therefore, that some standard rules should be agreed in order to secure such fairness. In order to combine a high level of consumer protection while freeing up international trade in all countries, several regulations entered into force in the European Union Law. This book introduces a comprehensive outline of such unfair competition law in the European Union and Turkey through focusing on particular regulations and directives.