The article analyses the main political and legal consequences of the transition from a parliamentary model of governance to a presidential system as a result of the constitutional amendments carried out in the Republic of Turkey in 2017. The study evaluates, in general terms, the structural changes in the distribution of powers between the executive, legislative and judicial branches, the strengthening of the presidential institution, the narrowing of the parliament’s oversight instruments over the government, and the reforms implemented in the organizational structure of the judiciary. On the basis of a comparative approach, it is argued that the new model formed in Turkey, differing from classical presidential and semi-presidential systems, can be characterised as a hybrid political system with party-presidential features.