Sem Steijn
Sem Steijn (born 17 November 2001) is a Dutch professional footballer who plays as a midfielder for ADO Den Haag.

Professional career
Steijn is a youth product of SV KMD and ADO Den Haag. On 27 July 2018, Steijn signed his first professional contract with ADO Den Haag, and was subsequently loaned to VVV-Venlo. Steijn made his professional debut for VVV in a 4–1 Eredivisie loss to Feyenoord on 6 December 2018. In doing so, he became the youngest ever Eredivisie debutant from VVV.

Personal life
Steijn is the son of Maurice Steijn, who is a Dutch former footballer and current manager of Al Wahda FC.