The topic of this thesis is the legal regulation of administrative procedure in the law of the European Union. The first part focuses on emphasizing the importance of administrative law in general and European law in legal systems of member states. Furthermore, the administrative law of the European Union is conceptually determined, and the legal sources of EU administrative law are explained as well. In addition to the above, the thesis will also briefly discuss the structure of the European Union's administration, i.e. the administrative structure of EU bodies and their importance for the implementation of rights at the level of the Union. Also, one part of the thesis is dedicated to interpreting administrative tasks performed in the EU. The fourth part provides a detailed analysis of the administrative procedure in the context of European law. For defining the concept and purpose of the procedure, particular emphasis is placed on the requirements necessary for the implementation of the administrative procedure and the existing types of procedures in European law. Finally, the proposal for a Regulation for an open, efficient and independent European Union administration is dealt with in particular detail and precision. A document proposed by the European Parliament that has not yet received a positive response from the European Commission is essential for the uniform code of administrative and procedural norms in EU law.