Races in calendar week 15/2021
All motorsport events on the weekend of 16–18 Apr 2021.
| Circuit | Country | Series |
|---|---|---|
| Barcelona |  Spain |
|
| Birmingham (Barber Motorsport Park) |  USA |
|
| Imola |  Italy |
|
| Monza | Italy |
|
| Morgan Park (Warwick) |  Australia |
|
| Nürburgring (Nordschleife) |  Germany |
|
| Richmond (oval) | USA |
|
| Symmons Plains | Australia |
|