The topic of the final paper is the difference between the parliamentary and presidential systems of government. In the Republic of Croatia, a tripartite division of power has been established, which is carried out by different state administration bodies, which must monitor and limit each other in their actions so that none of them abuses power to the detriment of the freedom and legal security of citizens. The presidential system or the system of the presidential government is a constitutionalpolitical system of government organization in which power is divided into legislative, executive and judicial, and each is independent in the area assigned to it by the constitution. The first characteristic of the presidential system refers to the unification of the president's ceremonial and political powers. Another characteristic is the division of legislative and executive personnel. The third characteristic is the absence of collective responsibility. The fourth characteristic concerns the mandate of the president. The parliamentary system is a model of a representative system and parliamentarism characterized by a close connection between the government, the executive and the legislature, the prime minister and ministers belong to the majority representative factions in the parliament, the political responsibility of the government towards the parliament, which can recall the government by a vote of no confidence, the right of the government to dissolve the parliament and call for new ones elections. Parliamentary and presidential systems differ in terms of the very meaning of the term, division of power, responsibilities, powers, ministers, dissolution of the lower house, and executive mandate.