Paulien Couckuyt (born 19 May 1997) is a Belgian track and field athlete who specializes in middle-distance running and 400 metres hurdles.

[1] In July 2019 she won the gold medal in the women's 400 metres hurdles at the European Athletics U23 Championships in Gävle, Sweden posting a personal best of 56.17s.

[9][10] Still in May, she ran a new personal best at the IFAM meeting in Oordegem, Belgium, and with a time of 55.37s met the qualification criterium for the 2020 Summer Olympics in Tokyo, Japan.

[15] In July 2022 she ran in final of the women's 4 × 400 metres relay at the 2022 World Athletics Championships in Eugene, Oregon finishing 6th.

[19] In November 2022, while in training camp with Team Belgium, in Belek, Turkey, she incurred a serious injury to the anterior cruciate ligament of her left knee that required an operation and sidelined her for most of the 2023 season.