This list of 1990 motorsport champions is a list of national or international auto racing series with a Championship decided by the points or positions earned by a driver from multiple races.
| Series | Driver | Season article |
|---|---|---|
| World Sportscar Championship |  Jean-Louis Schlesser Mauro Baldi | 1990 World Sportscar Championship season |
Teams:  Team Sauber Mercedes | ||
| IMSA GT Championship | GTP:  Geoff Brabham | 1990 IMSA GT Championship season |
Lights:  Tomás López | ||
GTO:  Dorsey Schroeder | ||
| GTU: Lance Stewart | ||
| All Japan Sports Prototype Championship |  Masahiro Hasemi Anders Olofsson | |
| Manufacturers: Nissan | ||
| Series | Driver | Season article |
|---|---|---|
| NASCAR Winston Cup Series | Dale Earnhardt | 1990 NASCAR Winston Cup Series |
| International Race of Champions | IROC XIV | |
| Stock Car Brazil |  Ingo Hoffmann | |
| Australian Super Speedway Championship | Robin Best | |
| AUSCAR | Brad Jones | |
| Series | Driver/Co-Driver | Season article |
|---|---|---|
| World Rally Championship |  Carlos Sainz Luis Moya | 1990 World Rally Championship season |
| Manufacturer: Lancia | ||
| FIA Cup for Production Cars | Alain Oreille Michel Roissard | |
Franz Binder