Races in calendar week 16/2021
All motorsport events on the weekend of 23–25 Apr 2021.
| Circuit | Country | Series |
|---|---|---|
| Goiânia |  Brazil |
|
| Sonoma (Sears Point) |  USA |
|
| St.Petersburg | USA |
|
| Suzuka |  Japan |
|
| Talladega (oval) | USA |
|
| Valencia (Cheste) |  Spain |
|