Justyna Święty-Ersetic (Polish pronunciation: ; born 3 December 1992) is a Polish sprinter specialising in the 400 metres. She was the 2018 European champion and a two-time European Indoor Championship medallist in this event. Święty-Ersetic won many medals at major championships as part of Polish 4 × 400 m relays, including a gold in the mixed relay and a silver in the women's relay at the 2020 Tokyo Olympics.
She is multiple Polish national outdoor and indoor champion.

Trophies 
 World Athletics Relays…
2024 |  European Athletics…
2022 |  World Athletics Indoor…
2022 |  European Athletics Indoor…
2021 |  European Athletics Team…
2021 |  Athletics Olympics Gold…
2020 |  Athletics Olympics Silver…
2020 |  European Athletics Indoor…
2019 |
 European Athletics Team…
2019 |  European Athletics Team…
2019 |  World Athletics…
2019 |  World Athletics Relays…
2019 |
 European Athletics…
2018 |  European Athletics…
2018 |  World Athletics Indoor…
2018 |  European Athletics Indoor…
2017 |
 European Athletics Indoor…
2017 |  World Athletics…
2017 |  World Athletics Relays…
2017 |  World Athletics Indoor…
2016 |
 European Athletics Indoor…
2015 |
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