The very concept of a united Europe began to emerge after World War II when the first European Coal and Steel Community was founded. The European Union is a community that could be said to be the result of cooperation and integration. The basic goals of the European union are, firstly, economic and political integration on the territory of the European continent. The union is recognized by some of the general principles, such as freedom, democracy, the rule of law, equal rights for all people and it is important to highlight that all Member States should comply with these principles. In this paper approaches the definition of European Union agencies. Agencies are a body of the Union conducted by the European public law. It`s origin dates back to the 70`s of the last century, in order to establish the internal market of the European Union. European union agencies must be differentiated from other institutions, such as the Council, Parliament, and the like, and it`s important to point out that they have their own own legal personality. They are established by the Parliament and the Council on a proposal from the Commission and are not anticipated in the Treaties.