Maas Willemsen

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Maas Willemsen (born 29 April 2003) is a Dutch professional footballer who plays as a defender for Eredivisie club Heerenveen.

Willemsen began his football career at SV Harfsen before moving to the youth academy of FC Twente. In 2014, he joined the youth setup of De Graafschap.

He was included in the first-team squad ahead of the 2022–23 season. He made his professional debut on 6 March 2023 in a 2–0 win over Helmond Sport, coming on as a late substitute for Mees Kaandorp.

In May 2025, Willemsen joined Heerenveen on a free transfer, signing a contract until June 2029.

He made his debut for Heerenveen on 13 September 2025 in an Eredivisie away match against Feyenoord, which ended in a 1–0 defeat. A week later, he made his first start in a 3–2 home win against N.E.C., playing the full match.

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Willemsen studies political philosophy at Radboud University Nijmegen.