In this thesis is analyzed the procedure for determinating violation of market competition. That kind of procedure is in the jurisdiction of Competition Agency. The purpose (point) of this procedure is to determine if there was prevention, restricition or violation of market competition. The procedure before the Competition Agency is administrative procedure. There for, the subject matter does not differentiate from the ''classic'' form of administrative procedure, but there are some differences that are specially regulated in the Law of protection of Market Competition and they are pointed out in this thesis. The thorough representation of the procedure before Competition Agency is given in this thesis substantiated with examples for easier understanding. The thesis is based on the Law of protection of Market Competition and Competition Agency's acts. Based on that representation, it can be concluded if the Agency's wide authority is justified in that kind of procedures, on which many theorists dispute. The thesis is conceived in several sections that represent specified parts of the procedure. In the first section is shown the inititaion and the presumptive parties of the procedure. Next section emphasize the gathering of information from the Agency itself, which enables it to provide the correctly decisions. After that section, follows processing of acts that precede the hearing. The final sections present possible Agency's decisions and the protection provided by court. At the end of thesis are drawn conclusions and the personal review of the importance of effective use of Right on Market Competition.