Races in calendar week 37/2021
All motorsport events on the weekend of 17–19 Sep 2021.
| Circuit | Country | Series |
|---|---|---|
| Assen |  Netherlands |
|
| Bristol (oval) |  USA |
|
| Goiânia |  Brazil |
|
| Monterey (Laguna Seca) | USA |
|
| Spa-Francorchamps |  Belgium |
|
| Watkins Glen | USA |
|