| 2021 ATP Lyon Open | |
|---|---|
| Date | 15–22 May |
| Edition | 4th |
| Category | ATP Tour 250 |
| Draw | 28S / 16D |
| Prize money | €419,470 |
| Surface | Clay / outdoor |
| Location | Lyon, France |
| Venue | Vélodrome Georges Préveral |
| Champions | |
| Singles | |
 Stefanos Tsitsipas[1] | |
| Doubles | |
 Hugo Nys /  Tim Pütz[2] | |
The 2021 ATP Lyon Open (also known as the Open Parc Auvergne-Rhône-Alpes Lyon) was a men's tennis tournament played on outdoor clay courts. It was the fourth edition of the Lyon Open and part of the ATP Tour 250 series of the 2021 ATP Tour. It took place in the city of Lyon, France, from 15 May through 22 May 2021. Second-seeded Stefanos Tsitsipas won the singles title.[3]
- ^ "2021 Lyon – Singles draw". Association of Tennis Professionals (ATP).
- ^ "2021 Lyon – Doubles draw". Association of Tennis Professionals (ATP).
- ^ "Open Parc Auvergne-Rhône-Alpes Lyon". www.atpworldtour.com. Association of Tennis Professionals (ATP).