The Polish parliament has given former prime minister Donald Tusk a mandate to form a new coalition government, APA reports citing BBC.
The incoming administration will be sworn in at the presidential palace by President Andrzei Duda on Wednesday.
It will put an end to the eight-year rule of the populist Law and Justice (PiS) party, which repeatedly clashed with EU authorities in Brussels.
Mr Tusk's coalition won the elections in October, but had been unable to take office until now.
Mr Tusk was previously prime minister of Poland between 2007 and 2014, later becoming European Council president.
October's elections saw his coalition win a majority of seats with a record turnout of more than 70%.
The grouping comprises three parties, Mr Tusk's Civic Coalition (KO), the Third Way and the Left.