Add to ORKGSupervision and control of public procurement is a crucial topic as public funds are used on a considerable amount of money with a significant amount of money from public budgets. If the contracting authority favors one of the participants, this will have a negative impact on all the country's inhabitants. These phenomena must be avoided; therefore, the regulation and controls in this area are important and necessary from the point of view of the independent body. In the Czech Republic, this power is placed in the hands of the Office for the Protection of Competition. The aim of the paper is to determine how the contracting authorities react to significant fines imposed by the Office for the Protection of Competition. Also, if the fine...