Classification
| Pos | No | Driver | Constructor | Laps | Time/Retired | Grid | Points |
|---|---|---|---|---|---|---|---|
| 1 | 5 | Nelson Piquet | Brabham-Ford | 60 | 1:51:23.97 | 5 | 9 |
| 2 | 29 | Riccardo Patrese | Arrows-Ford | 60 | + 4.58 | 9 | 6 |
| 3 | 2 | Carlos Reutemann | Williams-Ford | 60 | + 6.34 | 2 | 4 |
| 4 | 6 | Hector Rebaque | Brabham-Ford | 60 | + 22.89 | 13 | 3 |
| 5 | 28 | Didier Pironi | Ferrari | 60 | + 25.87 | 6 | 2 |
| 6 | 8 | Andrea de Cesaris | McLaren-Ford | 60 | + 1:06.61 | 14 | 1 |
| 7 | 27 | Gilles Villeneuve | Ferrari | 60 | + 1:41.97 | 1 | |
| 8 | 16 | René Arnoux | Renault | 59 | + 1 Lap | 3 | |
| 9 | 14 | Marc Surer | Ensign-Ford | 59 | + 1 Lap | 21 | |
| 10 | 7 | John Watson | McLaren-Ford | 58 | + 2 Laps | 7 | |
| 11 | 33 | Patrick Tambay | Theodore-Ford | 58 | + 2 Laps | 16 | |
| 12 | 1 | Alan Jones | Williams-Ford | 58 | + 2 Laps | 8 | |
| 13 | 10 | Slim Borgudd | ATS-Ford | 57 | +3 Laps | 24 | |
| NC | 25 | Jean-Pierre Jabouille | Ligier-Matra | 45 | Not Classified | 18 | |
| Ret | 17 | Eliseo Salazar | March-Ford | 38 | Spun Off | 23 | |
| Ret | 4 | Michele Alboreto | Tyrrell-Ford | 31 | Collision | 17 | |
| Ret | 32 | Beppe Gabbiani | Osella-Ford | 31 | Collision | 20 | |
| Ret | 23 | Bruno Giacomelli | Alfa Romeo | 28 | Collision | 11 | |
| Ret | 3 | Eddie Cheever | Tyrrell-Ford | 28 | Collision | 19 | |
| Ret | 22 | Mario Andretti | Alfa Romeo | 26 | Gearbox | 12 | |
| Ret | 20 | Keke Rosberg | Fittipaldi-Ford | 14 | Engine | 15 | |
| Ret | 26 | Jacques Laffite | Ligier-Matra | 7 | Suspension | 10 | |
| Ret | 15 | Alain Prost | Renault | 3 | Gearbox | 4 | |
| Ret | 31 | Miguel Angel Guerra | Osella-Ford | 0 | Accident | 22 | |
| DNQ | 30 | Siegfried Stohr | Arrows-Ford | ||||
| DNQ | 18 | Derek Daly | March-Ford | ||||
| DNQ | 9 | Jan Lammers | ATS-Ford | ||||
| DNQ | 21 | Chico Serra | Fittipaldi-Ford | ||||
| DNQ | 36 | Derek Warwick | Toleman-Hart | ||||
| DNQ | 35 | Brian Henton | Toleman-Hart | ||||
| WD | 11 | Elio de Angelis | Lotus-Ford | ||||
| WD | 12 | Nigel Mansell | Lotus-Ford |
Read more about this topic: 1981 San Marino Grand Prix