This list of 1991 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 | Champion | Refer |
|---|---|---|
| NHRA Winston Drag Racing Series | Top Fuel:  Joe Amato | 1991 NHRA Winston Drag Racing Series |
| Funny Car: John Force | ||
| Pro Stock: Darrell Alderman | ||
| Pro Stock Motorcycle: Dave Schultz | ||
| Series | Driver | Season article |
|---|---|---|
| CIK-FIA Karting World Championship | FK:  Jarno Trulli | |
| Formula A: Alessandro Manetti | ||
| FC: Alessandro Piccini | ||
| CIK-FIA Junior World Cup |  Sébastien Philippe | |
| CIK-FIA Karting European Championship | FSA: Massimiliano Orsini | |
| ICC: Roberto Motagnani | ||
| FA: Alessandro Manetti | ||
| ICA: Daniele Parrilla | ||
ICA-J:  Jordi Suralles | ||
| World Superkart Championship |  Martin Hines Perry Grondstra | |
| Series | Driver | Season article |
|---|---|---|
| World Sportscar Championship | Teo Fabi | 1991 World Sportscar Championship season |
| Teams: Silk Cut Jaguar | ||
| IMSA GT Championship | GTP:  Geoff Brabham | 1991 IMSA GT Championship season |
| Lights: Parker Johnstone | ||
| GTO: Pete Halsmer | ||
| AAC: Dick Greer | ||
| GTU: John Fergus | ||
| Porsche Supercup, Porsche Carrera Cup, GT3 Cup Challenge and Porsche Sprint Challenge | ||
| Porsche Carrera Cup France | Jean-Pierre Malcher | 1991 Porsche Carrera Cup France |
| Porsche Carrera Cup Germany |  Roland Asch | 1991 Porsche Carrera Cup Germany |
| Teams: Strähle Autosport | ||
| Series | Driver | Season article |
|---|---|---|
| Australian Touring Car Championship |  Jim Richards | 1991 Australian Touring Car Championship |
| Australian Endurance Championship | Mark Gibbs Rohan Onslow | 1991 Australian Endurance Championship |
| British Touring Car Championship | Will Hoy | 1991 British Touring Car Championship |
| Manufacturers: BMW | ||
| Deutsche Tourenwagen Meisterschaft | Frank Biela | 1991 Deutsche Tourenwagen Meisterschaft |
| Italian Touring Car Championship | Roberto Ravaglia | |
| Japanese Touring Car Championship |  Masahiro Hasemi | 1991 Japanese Touring Car Championship |
JTC-2:  Roland Ratzenberger | ||
| JTC-3: Osamu Nakako | ||
| New Zealand Touring Car Championship | Brett Riley | |
| Stock Car Brasil |  Ingo Hoffmann | 1991 Stock Car Brasil season |
| TC2000 Championship |  Juan María Traverso | 1991 TC2000 Championship |
| Series | Driver | Season article |
|---|---|---|
| European Truck Racing Championship | Class A: Richard Walker | 1991 European Truck Racing Championship |
Class B:  Jokke Kallio | ||
| Class C: Gerd Körber | ||
| Series | Driver | Season article |
|---|---|---|
| NASCAR Winston Cup Series | Dale Earnhardt | 1991 NASCAR Winston Cup Series |
| Manufacturers: Chevrolet | ||
| NASCAR Busch Grand National Series | Bobby Labonte | 1991 NASCAR Busch Series |
| Manufacturers: Oldsmobile | ||
| NASCAR Busch North Series | Ricky Craven | 1991 NASCAR Busch North Series |
| NASCAR Winston West Series | Bill Sedgwick | 1991 NASCAR Winston West Series |
| ARCA Bondo/Mar-Hyde Series | Bill Venturini | 1991 ARCA Bondo/Mar-Hyde Series |
| International Race of Champions | Rusty Wallace | IROC XV |
| AUSCAR | Brad Jones | 1990–91 AUSCAR season |
| Australian Super Speedway Championship | Robin Best | 1990–91 Australian Super Speedway Championship |
| Turismo Carretera | Oscar Aventín | 1991 Turismo Carretera |
| Series | Driver/Co-Driver | Season article |
|---|---|---|
| World Rally Championship | Juha Kankkunen | 1991 World Rally Championship |
| Co-Drivers: Juha Piironen | ||
| Manufacturer: Lancia | ||
| FIA Cup for Production Cars |  Grégoire De Mévius | |
| New Zealand Rally Championship | Possum Bourne | 1991 New Zealand Rally Championship |
| Co-Drivers: Rodger Freeth | ||
