Sem Steijn (born 12 November 2001) is a Dutch professional footballer who plays as an attacking midfielder for Eredivisie club Feyenoord, which he captains, and the Netherlands national team.
A product of the ADO Den Haag academy, Steijn made his professional debut on loan at VVV-Venlo under the management of his father Maurice in 2018. After breaking into ADO Den Haag's first team in the 2021–22 season, he moved to Twente. He finished as top scorer of the 2024–25 Eredivisie, being named Eredivisie Player of the Year. He was then signed by Feyenoord for a club record fee at the beginning of the following season and became captain of the team.
Steijn made his international debut for the Netherlands in 2025.
