See main article: article and 2021 ABN AMRO World Tennis Tournament.
Pierre-Hugues Herbert and Nicolas Mahut were the defending champions[1] but Mahut chose not to participate. Herbert partnered Jan-Lennard Struff, but they lost in the quarterfinals to Nikola Mektić and Mate Pavić.
Mektić and Pavić won the title, defeating Kevin Krawietz and Horia Tecău in the final, 7–6(9–7), 6–2.