| 1951 motorsport champions | |
| Previous: 1950 | Next: 1952 |
This list of 1951 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.
Motorcycle racing
| Series | Rider | Season article |
|---|---|---|
| 500cc World Championship |  Geoff Duke
|
1951 Grand Prix motorcycle racing season |
| Manufacturers: Norton
| ||
| 350cc World Championship | Geoff Duke
| |
| 250cc World Championship |  Bruno Ruffo
| |
| 125cc World Championship | Carlo Ubbiali
| |
| Manufacturers: Mondial
| ||
| Sidecars World Championship | Eric Oliver Lorenzo Dobelli
| |
| Speedway World Championship |  Jack Young
|
1951 Individual Speedway World Championship |
| AMA Grand National Championship |  Bobby Hill
|
Open wheel racing
| Series | Driver | Season article |
|---|---|---|
| World Championship of Drivers |  Juan Manuel Fangio
|
1951 Formula One season |
| AAA National Championship | Tony Bettenhausen
|
1951 AAA Championship Car season |
| West German Formula Two Championship |  Paul Pietsch
|
|
| Formula Three | ||
| British Formula Three Championship | Eric Brandon
|
1951 British Formula Three Championship |
| East German Formula Three Championship |  Werner Lehmann
|
1951 East German Formula Three Championship |
| West German Formula Three Championship | Walter Komossa
|
1951 West German Formula Three Championship |
Sports car and GT
| Series | Driver | Season article |
|---|---|---|
| SCCA National Sports Car Championship | John Fitch
|
1951 SCCA National Sports Car Championship season |