Reuven Niemeijer (born 27 March 1995) is a Dutch professional footballer who plays as a midfielder for club De Graafschap.
Niemeijer made his professional debut in the Eredivisie for Heracles Almelo on 2 December 2016 in a game against NEC
On 1 July 2020, he moved to Excelsior.
On 1 July 2022, Niemeijer signed with Brescia in Italy.
On 17 August 2023, Niemeijer signed with RKC Waalwijk for one year, with an option for a second year.
On 31 January 2025, Niemeijer joined De Graafschap on a one-and-a-half-year contract.