1951 Formula One season Teams and drivers Teams and drivers

| Entrant | Constructor_ | Chassis | Engine | Tyre | Driver | Rounds |
|---|---|---|---|---|---|---|
| Scuderia Ferrari | Ferrari | 125 375 | Ferrari 125 1.5 V12 s Ferrari 375 4.5 V12 | D P | José Froilán González | 4–8 |
| Alfa Romeo SpA | Alfa Romeo | 159 | Alfa Romeo 158 1.5 L8 s | P | Giuseppe Farina | 1, 3–8 |
| Alfa Romeo SpA | Alfa Romeo | 159 | Alfa Romeo 158 1.5 L8 s | P | Juan Manuel Fangio | 1, 3–8 |
| Alfa Romeo SpA | Alfa Romeo | 159 | Alfa Romeo 158 1.5 L8 s | P | Toulo de Graffenried | 1, 7–8 |
| Alfa Romeo SpA | Alfa Romeo | 159 | Alfa Romeo 158 1.5 L8 s | P | Consalvo Sanesi | 1, 3–5 |
| Alfa Romeo SpA | Alfa Romeo | 159 | Alfa Romeo 158 1.5 L8 s | P | Luigi Fagioli | 4 |