Bart Nieuwkoop is a Dutch right-back who came through Feyenoord's academy after earlier youth football with RBC Roosendaal. He made his Feyenoord first-team debut in 2015 and was part of the squad that won the 2016-17 Eredivisie title. After a loan to Willem II and a successful spell with Union Saint-Gilloise, he returned to Feyenoord in 2023 and added further domestic honours.