The president of the Portuguese Republic (Portuguese: Presidente da República Portuguesa, pronounced [pɾɨziˈðẽtɨ ðɐ ʁɛˈpuβlikɐ puɾtuˈɣezɐ]) is the head of state of Portugal.

The powers, functions and duties of prior presidential offices, and their relation with the prime minister and cabinets have over time differed with the various Portuguese constitutions. Currently, in the Third Republic, a semi-presidential system, the president holds no direct executive power, but is more than a merely ceremonial figure as is typically the case with parliamentary systems: one of his most significant responsibilities is the promulgation of all laws enacted by Parliament or the Government (an act without which such laws have no legal validity), with an alternative option to veto them (although this veto can be overcome in the case of laws approved by Parliament) or send them to the Constitutional Court for appreciation of whether they violate the Constitution. This and other abilities imply that the president of Portugal does not fit clearly into either of the three traditional powers – legislative, executive and judicial –, acting instead as a sort of "moderating power" among the traditional three.The current president of Portugal is Marcelo Rebelo de Sousa, who took office on 9 March 2016.