Justyna Święty-Ersetic
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Justyna Święty-Ersetic (Polish pronunciation: ; born 3 December 1992) is a Polish sprinter specialising in the 400 metres. She competed in the 4 × 400 m relay at the 2012 and 2016 Summer Olympics. She also won a bronze medal at the 2017 World Championships in the same event. At the 2018 European Championships in Berlin, she won an individual gold and later also anchored the Polish squad to the win despite the fact that both finals were separated by less than two hours.

Her personal bests in the 400 metres are 50.41 seconds outdoors (Berlin 2018) and 51.78 seconds indoors (Toruń 2018). The latter is the current national record.

In September 2017, she married Polish wrestler Dawid Ersetic.