Dariusz Kowaluk is a Polish sprinter specialising in the 400 metres. He won a silver medal in the 4 × 400 metres relay at the 2017 European U23 Championships as well as gold medal in the mixed 4 x 400 metres relay at the 2020 Summer Olympic Games.

The 2017 European Athletics U23 Championships were the 11th edition of the biennial athletics competition between European athletes under the age of twenty-three. It was held in Bydgoszcz, Poland from 13 to 16 July. This was the second time that the competition was hosted by Bydgoszcz after the 2003 edition.