The Civic Platform (Polish: Platforma Obywatelska, PO) was a centre-right liberal conservative political party in Poland. The party's most prominent leader was Donald Tusk, party chairman between 2003–2014 and 2021–2025.

It was formed in 2001 by splinter factions from the Solidarity Electoral Action, the Freedom Union and the Conservative People's Party, and it later placed second in the 2001 Polish parliamentary election. It remained at the opposition until the 2007 Polish parliamentary opposition, when it overtook Law and Justice, won 209 seats, and Tusk was elected as Prime Minister of Poland. Following the Smolensk air disaster in 2010, Bronisław Komorowski served as acting president of Poland and later won the 2010 Polish presidential election. Tusk continued to serve as prime minister and leader of Civic Platform until he resigned in 2014 to assume the post of the president of the European Council. The party was defeated in the 2015 Polish parliamentary and presidential elections. It placed second in the 2019 Polish parliamentary election, and its 2020 Polish presidential election candidate, Rafał Trzaskowski, won 49% of the popular vote in the second round and lost the election to Andrzej Duda.

Initially positioned as a Christian democratic party with strong economically liberal tendencies, it soon adopted liberal conservatism throughout the 2000s. During its time in power, it was aligned with more pragmatic and centrist views, and was characterized as a catch-all party. In the 2010s, the Civic Platform adopted more socially liberal policies, aligned itself with conservative liberalism and economic neoliberalism, and it has since been positioned in the centre-right. It has also strongly advocated for Poland's membership in the European Union and NATO. It was a member of the European People's Party.

The party headed an electoral alliance Civic Coalition, which was founded in 2018. Since its creation, it had shown strong electoral performances in Warsaw, the west, and the north of Poland. Since the 2000s, the Civic Platform had established itself as one of the dominant political parties in Poland. On 25 October 2025, the party merged into a new party called Civic Coalition, bearing the same name as the PO-led electoral coalition from 2018.

The Civic Platform was founded in 2001 as economically liberal, Christian-democratic split from existing parties. Founders Andrzej Olechowski, Maciej Płażyński, and Donald Tusk were sometimes jokingly called "the Three Tenors" by Polish media and commentators. Olechowski and Płażyński left the party during the 2001–2005 parliamentary term, leaving Tusk as the sole remaining founder, and current party leader.

In the 2001 general election, the party secured 12.6% of the vote and 65 deputies in the Sejm, making it the largest opposition party to the government led by the Democratic Left Alliance (SLD). In the 2002 local elections, PO stood together with Law and Justice in 15 voivodeships (in 14 as POPiS, in Podkarpacie with another centre-right political parties). They stood separately only in Mazovia.

The POPiS coalition won 12% of the popular vote nationally, which was well below the expectations. Ludwik Dorn, the chairman of the PiS parliamentary club at the time, remarked: "Together, we gained as much as the PO itself collected a year earlier." This marked the point at which PO and PiS, until now ideological and political allies, started to grow apart. The leadership of PiS decided that it had to distance itself from PO and change its ideology in order to increase its popular support.

In 2005, PO led all opinion polls with 26% to 30% of public support. However, in the 2005 general election, in which it was led by Jan Rokita, PO polled only 24.1% and unexpectedly came second to the 27% garnered by Law and Justice (PiS). A centre-right coalition of PO and PiS (nicknamed POPiS) was deemed most likely to form a government after the election. Yet the putative coalition parties had a falling out in the wake of the fiercely contested Polish presidential election of 2005.