Koen Jansen (born 11 March 2004) is a Dutch professional footballer who plays as a left-back for Eerste Divisie club Roda JC.
On 10 January 2022, he earned his first start under coach Ruud van Nistelrooy in a match against Almere City, with Jansen providing two assists in a 5–1 win.
[7] Jansen made his competitive debut for Roda on 1 September, replacing Brian Koglin during half-time in a 4–1 home loss to De Graafschap.
[8][9] Jansen gained his first international cap for the Netherlands under-18 team on 6 September 2021, in a 5–0 friendly win against Italy U18 in 's-Gravenzande and made five appearances at this level.
[10] On 21 September 2022, he earned his first cap for the Netherlands U19 team in a 2–0 victory over Moldova U19 in Hardenberg, appearing in three matches for the under-19 squad.