Olivier Aertssen (born 7 August 2004) is a Dutch professional footballer who plays for Eredivisie club PEC Zwolle.

[1] Olivier Aertssen started his footballing career in amateur teams between Oirschot, Wolphaartsdijk and Kloetinge, before joining Sparta Rotterdam in 2018 and the Ajax Youth Academy a year later, as they had a partnership with the club from Rotterdam.

[2][3] Starting the 2021–22 season as a regular with the Ajax youth team, most notably in the UEFA Youth League,[4][5][6] Aertssen made his professional debut for Jong Ajax on the 10 January 2022, starting the 2–0 away Eerste Divisie win against Jong Utrecht as a center-back.

[2] By doing so he became the fourth youngest professional footballer from the province of Zeeland, just behind John Karelse, Erwin Nuytinck and Rick van Drongelen.

[7] Aertssen was called up to Ajax senior squad regularly in the 2022–23 and 2023–24 seasons, his only competitive appearance for the team was on 11 January 2023 in a KNVB Cup game against Den Bosch.