Gran Premio di San Marino 1981
| Pos | No | Driver | Constructor | Laps | Time / Gap | Pts | Grid | |
|---|---|---|---|---|---|---|---|---|
| 1 | 5 | Nelson Piquet | Brabham | 60 | 1:51:23.970 | 9 | 5 | |
| 2 | 29 | Riccardo Patrese | Arrows | 60 | 1:51:28.550 | 6 | 9 | |
| 3 | 2 | Carlos Reutemann | Williams | 60 | 1:51:30.310 | 4 | 2 | |
| 4 | 6 | Héctor Rebaque | Brabham | 60 | 1:51:46.860 | 3 | 13 | |
| 5 | 28 | Didier Pironi | Ferrari | 60 | 1:51:49.840 | 2 | 6 | |
| 6 | 8 | Andrea de Cesaris | McLaren | 60 | 1:52:30.580 | 1 | 14 | |
| 7 | 27 | Gilles Villeneuve | Ferrari | 60 | 1:53:05.940 | — | 1 | Pole FL |
| 8 | 16 | René Arnoux | Renault | 59 | +1 lap | — | 3 | |
| 9 | 14 | Marc Surer | Ensign | 59 | +1 lap | — | 21 | |
| 10 | 7 | John Watson | McLaren | 58 | +2 laps | — | 7 | |
| 11 | 33 | Patrick Tambay | Theodore | 58 | +2 laps | — | 16 | |
| 12 | 1 | Alan Jones | Williams | 58 | +2 laps | — | 8 | |
| 13 | 10 | Slim Borgudd | ATS | 57 | +3 laps | — | 24 | |
| NC | 25 | Jean-Pierre Jabouille | Ligier | 45 | +15 laps | — | 18 | |
| DNF | 17 | Eliseo Salazar | March | 38 | Spun off | — | 23 | |
| DNF | 4 | Michele Alboreto | Tyrrell | 31 | Collision | — | 17 | |
| DNF | 32 | Beppe Gabbiani | Osella | 31 | Collision | — | 20 | |
| DNF | 23 | Bruno Giacomelli | Alfa Romeo | 28 | Collision | — | 11 | |
| DNF | 3 | Eddie Cheever | Tyrrell | 28 | Collision | — | 19 | |
| DNF | 22 | Mario Andretti | Alfa Romeo | 26 | Gearbox | — | 12 | |
| DNF | 20 | Keke Rosberg | Fittipaldi | 14 | Engine | — | 15 | |
| DNF | 26 | Jacques Laffite | Ligier | 7 | Suspension | — | 10 | |
| DNF | 15 | Alain Prost | Renault | 3 | Gearbox | — | 4 | |
| DNF | 31 | Miguel Ángel Guerra | Osella | 0 | Accident | — | 22 | |
| DNQ | 30 | Siegfried Stohr | Arrows | — | — | — | — | |
| DNQ | 18 | Derek Daly | March | — | — | — | — | |
| DNQ | 9 | Jan Lammers | ATS | — | — | — | — | |
| DNQ | 21 | Chico Serra | Fittipaldi | — | — | — | — | |
| DNQ | 36 | Derek Warwick | Toleman | — | — | — | — | |
| DNQ | 35 | Brian Henton | Toleman | — | — | — | — |
| Pos | Driver | Constructor | Q1 | Q2 | Q3 | Time |
|---|---|---|---|---|---|---|
| 1 | Gilles Villeneuve | Ferrari | — | — | — | 1:34.523 |
| 2 | Carlos Reutemann | Williams | — | — | — | 1:35.229 |
| 3 | René Arnoux | Renault | — | — | — | 1:35.281 |
| 4 | Alain Prost | Renault | — | — | — | 1:35.579 |
| 5 | Nelson Piquet | Brabham | — | — | — | 1:35.733 |
| 6 | Didier Pironi | Ferrari | — | — | — | 1:35.868 |
| 7 | John Watson | McLaren | — | — | — | 1:36.241 |
| 8 | Alan Jones | Williams | — | — | — | 1:36.280 |
| 9 | Riccardo Patrese | Arrows | — | — | — | 1:36.390 |
| 10 | Jacques Laffite | Ligier | — | — | — | 1:36.477 |
| 11 | Bruno Giacomelli | Alfa Romeo | — | — | — | 1:36.776 |
| 12 | Mario Andretti | Alfa Romeo | — | — | — | 1:36.919 |
| 13 | Héctor Rebaque | Brabham | — | — | — | 1:37.264 |
| 14 | Andrea de Cesaris | McLaren | — | — | — | 1:37.382 |
| 15 | Keke Rosberg | Fittipaldi | — | — | — | 1:37.459 |
| 16 | Patrick Tambay | Theodore | — | — | — | 1:37.545 |
| 17 | Michele Alboreto | Tyrrell | — | — | — | 1:37.771 |
| 18 | Jean-Pierre Jabouille | Ligier | — | — | — | 1:38.140 |
| 19 | Eddie Cheever | Tyrrell | — | — | — | 1:38.266 |
| 20 | Beppe Gabbiani | Osella | — | — | — | 1:38.302 |
| 21 | Marc Surer | Ensign | — | — | — | 1:38.340 |
| 22 | Miguel Ángel Guerra | Osella | — | — | — | 1:38.773 |
| 23 | Eliseo Salazar | March | — | — | — | 1:38.827 |
| 24 | Slim Borgudd | ATS | — | — | — | 1:39.079 |
| 25 | Siegfried Stohr | Arrows | — | — | — | 1:39.112 |
| 26 | Derek Daly | March | — | — | — | 1:39.157 |
| 27 | Jan Lammers | ATS | — | — | — | 1:39.419 |
| 28 | Chico Serra | Fittipaldi | — | — | — | 1:41.114 |
| 29 | Derek Warwick | Toleman | — | — | — | 1:43.187 |
| 30 | Brian Henton | Toleman | — | — | — | 1:49.951 |
| Grid | Driver | Constructor | Quali | Penalty |
|---|---|---|---|---|
| 1 | Gilles Villeneuve | Ferrari | 1 | — |
| 2 | Carlos Reutemann | Williams | 2 | — |
| 3 | René Arnoux | Renault | 3 | — |
| 4 | Alain Prost | Renault | 4 | — |
| 5 | Nelson Piquet | Brabham | 5 | — |
| 6 | Didier Pironi | Ferrari | 6 | — |
| 7 | John Watson | McLaren | 7 | — |
| 8 | Alan Jones | Williams | 8 | — |
| 9 | Riccardo Patrese | Arrows | 9 | — |
| 10 | Jacques Laffite | Ligier | 10 | — |
| 11 | Bruno Giacomelli | Alfa Romeo | 11 | — |
| 12 | Mario Andretti | Alfa Romeo | 12 | — |
| 13 | Héctor Rebaque | Brabham | 13 | — |
| 14 | Andrea de Cesaris | McLaren | 14 | — |
| 15 | Keke Rosberg | Fittipaldi | 15 | — |
| 16 | Patrick Tambay | Theodore | 16 | — |
| 17 | Michele Alboreto | Tyrrell | 17 | — |
| 18 | Jean-Pierre Jabouille | Ligier | 18 | — |
| 19 | Eddie Cheever | Tyrrell | 19 | — |
| 20 | Beppe Gabbiani | Osella | 20 | — |
| 21 | Marc Surer | Ensign | 21 | — |
| 22 | Miguel Ángel Guerra | Osella | 22 | — |
| 23 | Eliseo Salazar | March | 23 | — |
| 24 | Slim Borgudd | ATS | 24 | — |
| # | Driver | Constructor | Lap | Time | Gap |
|---|---|---|---|---|---|
| 1 | Gilles Villeneuve | Ferrari | 46 | 1:48.064 | — |
Drivers after race
| Pos | Driver | Pts |
|---|---|---|
| 1 | Carlos Reutemann | 25 |
| 2 | Nelson Piquet | 22 |
| 3 | Alan Jones | 18 |
| 4 | Riccardo Patrese | 10 |
| 5 | Alain Prost | 4 |
| 6 | Mario Andretti | 3 |
| 6 | Marc Surer | 3 |
| 6 | Héctor Rebaque | 3 |
| 9 | Elio de Angelis | 3 |
| 10 | Eddie Cheever | 2 |
| 10 | René Arnoux | 2 |
| 10 | Didier Pironi | 2 |
| 13 | Patrick Tambay | 1 |
| 13 | Jacques Laffite | 1 |
| 13 | Andrea de Cesaris | 1 |