In the first part of the diploma, the concept of purchase and procurement was defined. The basic task of procurement is to ensure the availability of the capacity of the means of supply. Public procurement in the territory of the Republic of Croatia represents business within the framework of public bodies, and public procurement departments are established within them. The emphasis of these departments is on the implementation of public procurement in a transparent manner, which has been increased by the creation of electronic access to public procurement. In the practical part, an analysis of public procurement was carried out on the example of Brod-Posavina County. Given that two offers were received, the price of the offer and the delivery period were taken into account, and based on the above parameters, the company INA d.d. was selected. which achieved the maximum number of points in previous public procurements for heating oil. Considering the specificity of public procurement, i.e. the procurement of heating oil, it is not surprising that a small number of bidders applied, as well as the fact that INA d.d. leading company of oil derivatives as heating oil. After the public procurement procedure has been carried out, it can be concluded that a certain type of monopoly of the leading oil industry in this area, namely INA d.d., reigns in the territory of the Republic of Croatia. On the one hand, this is visible in the number of applicants for the public procurement advertisement, i.e. that only one company applied in addition to the selected company, namely Petrol d.d.