If no contender wins more than 50 percent of the vote, under Polish election rules, a second round will be held two weeks later, on June 1.
Front-runners in the presidential race include Warsaw Mayor Rafał Trzaskowski, supported by the governing Civic Coalition (KO), and Karol Nawrocki, head of the Institute of National Remembrance (IPN), backed by the opposition Law and Justice (PiS) party.
Rafał Trzaskowski. Photo: Cezary Piwowarski/Polskie Radio
Karol Nawrocki. Photo: PAP/Paweł Supernak
Other candidates include leftist politician Magdalena Biejat, far-right hopeful Sławomir Mentzen, and conservative lawmaker Marek Jakubiak.
Magdalena Biejat. Photo: Przemysław Chmielewski/Polskie Radio
Sławomir Mentzen. Photo: Robert Bartosewicz/PR24
Marek Jakubiak. Photo: Polskie Radio/Piotr Podlewski
Hołownia himself has also thrown his hat in the ring, announcing his bid for the presidency in mid-November.
While he is seen as one of Poland's most trusted politicians, recent polls suggest he is not currently favoured to win the election.
Conservative incumbent Andrzej Duda, who has been president since 2015, is ineligible to seek a third term under election rules.
Andrzej Duda. Photo: Marek Borawski/KPRP
Duda's second term in office ends on August 6.
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Source: TVP Info, IAR, PAP