Thomas van den Belt (born 18 June 2001) is a Dutch professional footballer who plays as a midfielder for Spanish Segunda División club Castellón on loan from Feyenoord.

[1] He made his professional debut on 26 September 2020, entering the match as a substitute for Yuta Nakayama in the 74th minute during a 4–0 home Eredivisie victory over Sparta Rotterdam.

[2][3] On 14 January 2022, Van den Belt scored his first professional goals, securing a brace that led to PEC's 2–0 victory over Willem II.

[7] He made his debut for the club on 4 August, replacing Marcus Holmgren Pedersen in the 83rd minute of a 1–0 loss to rivals PSV in the Johan Cruyff Shield.

[10] On 13 December, he went on to make his European debut, replacing Quinten Timber in the 54th minute of Feyenoord's 2–1 loss to Celtic in the UEFA Champions League group stage.