The theme of this thesis is the European Union trade mark and its relation to the national trade mark. Three main chapters are devoted to this subject. The first chapter provides a brief introduction to the concept of trade mark in general and its history. The second chapter is about the core of the matter and illustrates the European Union trade mark itself - elements required by the Regulation, the registration process and the trade mark's effects. The next chapter discusses the relationship between the national trade mark and the European Union trade mark as two systems existing next to each other that do influence each other.