| «1981-04» | San Marino Grand Prix - I Gran Premio di San Marino |
| 1981-05-03 | Imola - Autodromo Internazionale Enzo e Dino Ferrari - 60 laps × 5.04 km : 302.4 km |
| Pos | Grid | Car | Driver | Constructor | Time | Gap | Interval |
|---|---|---|---|---|---|---|---|
| 1 | 1 | 27 | Gilles Villeneuve | Ferrari | 01:34.523 | 191.953 km/h | |
| 2 | 2 | 2 | Carlos Reutemann | Williams • Ford Cosworth | 01:35.229 | +00.706 (+0.747%) | +00.706 |
| 3 | 3 | 16 | René Arnoux | Renault | 01:35.281 | +00.758 (+0.802%) | +00.052 |
| 4 | 4 | 15 | Alain Prost | Renault | 01:35.579 | +01.056 (+1.117%) | +00.298 |
| 5 | 5 | 5 | Nelson Piquet | Brabham • Ford Cosworth | 01:35.733 | +01.210 (+1.280%) | +00.154 |
| 6 | 6 | 28 | Didier Pironi | Ferrari | 01:35.868 | +01.345 (+1.423%) | +00.135 |
| 7 | 7 | 7 | John Watson | McLaren • Ford Cosworth | 01:36.241 | +01.718 (+1.818%) | +00.373 |
| 8 | 8 | 1 | Alan Jones | Williams • Ford Cosworth | 01:36.280 | +01.757 (+1.859%) | +00.039 |
| 9 | 9 | 29 | Riccardo Patrese | Arrows • Ford Cosworth | 01:36.390 | +01.867 (+1.975%) | +00.110 |
| 10 | 10 | 26 | Jacques Laffite | Ligier • Matra | 01:36.477 | +01.954 (+2.067%) | +00.087 |
| 11 | 11 | 23 | Bruno Giacomelli | Alfa Romeo | 01:36.776 | +02.253 (+2.384%) | +00.299 |
| 12 | 12 | 22 | Mario Andretti | Alfa Romeo | 01:36.919 | +02.396 (+2.535%) | +00.143 |
| 13 | 13 | 6 | Hector Rebaque | Brabham • Ford Cosworth | 01:37.264 | +02.741 (+2.900%) | +00.345 |
| 14 | 14 | 8 | Andrea de Cesaris | McLaren • Ford Cosworth | 01:37.382 | +02.859 (+3.025%) | +00.118 |
| 15 | 15 | 20 | Keke Rosberg | Fittipaldi • Ford Cosworth | 01:37.459 | +02.936 (+3.106%) | +00.077 |
| 16 | 16 | 33 | Patrick Tambay | Theodore • Ford Cosworth | 01:37.545 | +03.022 (+3.197%) | +00.086 |
| 17 | 17 | 4 | Michele Alboreto | Tyrrell • Ford Cosworth | 01:37.771 | +03.248 (+3.436%) | +00.226 |
| 18 | 18 | 25 | Jean-Pierre Jabouille | Ligier • Matra | 01:38.140 | +03.617 (+3.827%) | +00.369 |
| 19 | 19 | 3 | Eddie Cheever | Tyrrell • Ford Cosworth | 01:38.266 | +03.743 (+3.960%) | +00.126 |
| 20 | 20 | 32 | Beppe Gabbiani | Osella • Ford Cosworth | 01:38.302 | +03.779 (+3.998%) | +00.036 |
| 21 | 21 | 14 | Marc Surer | Ensign • Ford Cosworth | 01:38.340 | +03.817 (+4.038%) | +00.038 |
| 22 | 22 | 31 | Miguel Angel Guerra | Osella • Ford Cosworth | 01:38.773 | +04.250 (+4.496%) | +00.433 |
| 23 | 23 | 17 | Eliseo Salazar | March • Ford Cosworth | 01:38.827 | +04.304 (+4.553%) | +00.054 |
| 24 | 24 | 10 | Slim Borgudd | ATS • Ford Cosworth | 01:39.079 | +04.556 (+4.820%) | +00.252 |
| 25 | 30 | Siegfried Stohr | Arrows • Ford Cosworth | 01:39.112 | +04.589 (+4.855%) | +00.033 | |
| 26 | 18 | Derek Daly | March • Ford Cosworth | 01:39.157 | +04.634 (+4.903%) | +00.045 | |
| 27 | 9 | Jan Lammers | ATS • Ford Cosworth | 01:39.419 | +04.896 (+5.180%) | +00.262 | |
| 28 | 21 | Chico Serra | Fittipaldi • Ford Cosworth | 01:41.114 | +06.591 (+6.973%) | +01.695 | |
| 29 | 36 | Derek Warwick | Toleman • Hart | 01:43.187 | +08.664 (+9.166%) | +02.073 | |
| 30 | 35 | Brian Henton | Toleman • Hart | 01:49.951 | +15.428 (+16.322%) | +06.764 |