Poland is a social democracy, with a President as a Head of State, whose current constitution dates from 1997. The government structure centres on the Council of Ministers, led by a prime minister. The president appoints the cabinet according to the proposals of the prime minister, typically from the majority coalition in the Sejm. The president is elected by popular vote every five years. The current president is Lech Kaczyński, the current prime minister is Donald Tusk.

Polish voters elect a bicameral parliament consisting of a 460-member lower house (Sejm) and a 100-member Senate (Senat). The Sejm is elected under proportional representation according to the d’Hondt method, a method similar to that used in many parliamentary political systems. The Senate, on the other hand, is elected under a rare plurality bloc voting method where several candidates with the highest support are elected from each constituency. With the exception of ethnic minority parties, only candidates of political parties receiving at least 5% of the total national vote can enter the Sejm. When sitting in joint session, members of the Sejm and Senate form the National Assembly (the Zgromadzenie Narodowe). The National Assembly is formed on three occasions: when a new President takes the oath of office; when an indictment against the President of the Republic is brought to the State Tribunal (Trybunał Stanu); and when a President’s permanent incapacity to exercise his duties due to the state of his health is declared. To date, only the first instance has occurred.

The judicial branch plays an important role in decision-making. Its major institutions include the Supreme Court of Poland (Sąd Najwyższy); the Supreme Administrative Court of Poland (Naczelny Sąd Administracyjny); the Constitutional Tribunal of Poland (Trybunał Konstytucyjny); and the State Tribunal of Poland (Trybunał Stanu). On the approval of the Senate, the Sejm also appoints the Ombudsman or the Commissioner for Civil Rights Protection (Rzecznik Praw Obywatelskich) for a five-year term. The Ombudsman has the duty of guarding the observance and implementation of the rights and liberties of Polish citizens and residents, of the law and of principles of community life and social justice.