Debates on the system of government are an indispensable issue of the Turkish political agenda for a long time. Besides academic circles, politicians, bureaucracy, and society, political parties which are natural elements of democratic life are the subject of these discussions. Transition to Presidential Government System determining the context of today’s debates of the system of government has a wide coverage on the political parties’ propagandas in Turkey. From this point of view, reactions/opinions/approaches of political parties after the transition process of the parliamentary system to the Presidential Government System and its post contains very important indications both in the evaluation of the new government system and its applicability. Starting from this idea, opposition parties in Turkey were focused in the context of their criticisms to amendments in the system of government in the study. However, due to limiting the study, not all active opposition parties of the Turkish political life were included in the scope; parties that have representatives in the parliament were analyzed. In this manner, the Republican People’s Party, the Nationalist Action Party, the IYI Party, the Felicity Party, the Peoples’ Democratic Party (PDP), the Workers’ Party of Turkey (WPT), Democrat Party, and the Grand Unity Party (GUP) were specified as parties which their approaches were examined. In this context, critics of parties to the Presidential Government System also called the party presidential system that came into force in 2018 constitutes the subject of the study. The main purpose of the study is to reveal the focal points of the opposition parties’ system criticisms or discourses that support the system with comparative analysis. For this purpose, the study examines the discourses/manifestations of the selected opposition parties from 2010 that system of government discussions has been becoming political agenda. It can be stated that while RPP, IYI Party, Felicity Party, PDP, WPT, and Democrat Party criticized the effectuated government system in certain aspects, NAP and GUP did not opposite the new system significantly as a result of the study. While parties’ criticism mostly concentrated on the partial president, violation of the separation of power and compliance problem of the new system to Turkey, eliminating the deadlocks in the decision-making processes and stable government has been the main reasons for the parties supporting the new system. It should be noted that criticism of opposition parties is similar to main discourses.