| 2021 Dutch Open | |
|---|---|
| Date | 12 – 18 July |
| Surface | Clay / outdoor |
| Location | Amersfoort, Netherlands |
| Champions | |
| Singles | |
 Tallon Griekspoor | |
| Doubles | |
 Luca Castelnuovo /  Manuel Guinard | |
The 2021 Dutch Open, also known by its sponsored name Van Mossel Kia Dutch Open, was a professional tennis tournament played on clay courts. It was the second edition of the Challenger tournament which was part of the 2021 ATP Challenger Tour. It took place in Amersfoort, Netherlands between 12 and 18 July 2021.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| NED | Tallon Griekspoor | 124 | 1 |
| NED | Botic van de Zandschulp | 139 | 2 |
 AUS | Marc Polmans | 154 | 3 |
| FRA | Antoine Hoang | 156 | 4 |
 EGY | Mohamed Safwat | 170 | 5 |
 BEL | Kimmer Coppejans | 191 | 6 |
 ARG | Guido Andreozzi | 203 | 7 |
 CZE | Lukáš Rosol | 204 | 8 |
The following players received wildcards into the singles main draw:
Gijs Brouwer Ryan Nijboer Jelle Sels The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Michael Geerts Alexander Maarten Jong Johan Nikles Deney Wassermann Tallon Griekspoor def. Botic van de Zandschulp 6–1, 3–6, 6–1. Luca Castelnuovo / Manuel Guinard def. 
Sergio Galdós / 
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