Alberto Ascari won the Italian Grand Prix 1951 at Autodromo Nazionale di Monza on 16 September 1951, starting from P3 on the grid. José Froilán González finished second for Ferrari, with Felice Bonetto completing the podium for Alfa Romeo.
| Pos | Grid | Driver | Team | Laps | Time / Status | Pts | FL |
|---|---|---|---|---|---|---|---|
| 1 | 3 | Alberto AscariASC | Ferrari | 80 | 2:42:39.3 | 8 | |
| 2 | 4 | José Froilán GonzálezGON | Ferrari | 80 | +24.6 | 6 | |
| 3 | 7 | Felice BonettoBON | Alfa Romeo | 79 | +1 Lap | 2 | |
| 3 | 7 | Nino FarinaFAR | Alfa Romeo | 79 | +1 Lap | 3 | |
| 4 | 5 | Luigi VilloresiVIL | Ferrari | 79 | +1 Lap | 3 | |
| 5 | 6 | Piero TaruffiTAR | Ferrari | 78 | +2 Laps | 2 | |
| 6 | 11 | André SimonSIM | Simca | 74 | +6 Laps | 0 | |
| 7 | 15 | Louis RosierROS | Talbot-Lago | 73 | +7 Laps | 0 | |
| 8 | 14 | Yves CabantousCAB | Talbot-Lago | 72 | +8 Laps | 0 | |
| 9 | 18 | Franco RolROL | OSCA | 67 | +13 Laps | 0 | |
| R | 1 | Juan FangioFAN | Alfa Romeo | 39 | Engine | 0 | |
| R | 12 | Maurice TrintignantTRI | Simca | 29 | Engine | 0 | |
| R | 13 | Robert ManzonMAN | Simca | 29 | Engine | 0 | |
| R | 17 | Louis ChironCHI | Talbot-Lago | 23 | Ignition | 0 | |
| R | 20 | Pierre LeveghLEV | Talbot-Lago | 9 | Engine | 0 | |
| R | 22 | Jacques SwatersSWA | Talbot-Lago | 7 | Overheating | 0 | |
| R | 2 | Nino FarinaFAR | Alfa Romeo | 6 | Engine | 0 | |
| R | 21 | Johnny ClaesCLA | Talbot-Lago | 4 | Oil pump | 0 | |
| R | 9 | Toulo de GraffenriedDEG | Alfa Romeo | 1 | Supercharger | 0 | |
| R | 19 | Peter WhiteheadWHI | Ferrari | 1 | Magneto | 0 | |
| R | 16 | Chico LandiLAN | Ferrari | 0 | Transmission | 0 | |
| W | 8 | Reg ParnellPAR | BRM | 0 | Withdrew | 0 | |
| W | 10 | Ken RichardsonRIC | BRM | 0 | Withdrew | 0 |