Koen Bucker (born 18 June 1996) is a Dutch professional footballer who plays as a goalkeeper for Eerste Divisie club Roda JC.

[3] On 31 July 2018, Bucker signed with Eredivisie club Heracles Almelo on a two-year deal with an option for an additional season.

On 1 November 2020, Bucker made his Eredivisie debut for the club, as Janis Blaswich and Michael Brouwer were absent.

[5] On 14 August 2023, Bucker joined Eerste Divisie club Roda JC on a two-year contract with the option for a further year.

[1] Four days later, Bucker made his debut for Roda as a starter in a 3–0 away victory against ADO Den Haag, confirming himself as first goalkeeper on the depth chart for De Koempels.