Piotr Sylwester Chmielowski (27 April 1965 – 28 June 2026) was a Polish businessman and politician. He was a member of the 7th Term Sejm (2011–2015) and was the leader of New Democracy – Yes between 2024 and 2026.
Life and career Piotr Sylwester Chmielowski was born on 27 April 1965. He graduated in 1990 from the at the Silesian University of Technology, and also studied at the Polish Institute of International Affairs. In 1991, he set up his own business specialising in the distribution of medical devices. He became deputy editor-in-chief of a trade journal and, in 2001, vice-chairman of the board of the Association of Dental Manufacturers and Distributors.
In the 2011 Polish parliamentary election, he was elected to the Sejm, standing as the lead candidate on the Palikot's Movement list in the Rybnik constituency and receiving 9,925 votes.Dz. U. z 2011 r. Nr 218, poz. 1294 On 5 July 2013, he was suspended from the Palikot Movement's parliamentary group, and two days later he was expelled from it. On 3 September of the same year, the Palikot Movement announced that he had also been expelled from the party, and Piotr Chmielowski himself announced that he was joining the Democratic Left Alliance. A week later, he became a member of the SLD parliamentary group, and on 27 November of the same year, he also joined the party. He represented the SLD in the September 2014 Senate by-election in Rybnik, finishing in last place (4th) in the constituency.
In the 2015 Polish parliamentary election, he failed to secure re-election to the Sejm. In November 2016, he left the SLD. In 2020, he became chairman of the New Democracy – Yes party, formed following the re-registration of Przedsiębiorcza RP. He subsequently became involved with the Social Movement Association (). In 2023, he stepped down as leader of New Democracy – Yes in favour of Marek Materek; he became the party's secretary-general, and subsequently its vice-president. He became the leader of the party again on 19 January 2024 after Marek Materek resigned from the leadership.
Chmielowski died on 28 June 2026, at the age of 61.
Election history + Year Body Constituency Party Votes Result . Total % 2011 Sejm no. 30 (Rybnik) Palikot's Movement 9,925 3.76 2014 Senate Democratic Left Alliance 922 4.02 2015 Sejm no. 30 (Rybnik) United Left 979 0.34
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