Round 4 · 1981
San Marino Grand Prix
Autodromo Enzo e Dino Ferrari, Italy · Sun 3 May · 00:00 UTC
Race
| Pos | Driver | Team | Grid | Time / Status | Points |
|---|---|---|---|---|---|
| 1 | Nelson Piquet | Brabham | 5 | 1:51:23.970 | 9 |
| 2 | Riccardo Patrese | Arrows | 9 | +4.580 | 6 |
| 3 | Carlos Reutemann | Williams | 2 | +6.340 | 4 |
| 4 | Hector Rebaque | Brabham | 13 | +22.890 | 3 |
| 5 | Didier Pironi | Ferrari | 6 | +25.870 | 2 |
| 6 | Andrea de Cesaris | McLaren | 14 | +1:06.610 | 1 |
| 7 | Gilles Villeneuve | Ferrari | 1 | +1:41.970 | |
| 8 | René Arnoux | Renault | 3 | +1 Lap | |
| 9 | Marc Surer | Ensign | 21 | +1 Lap | |
| 10 | John Watson | McLaren | 7 | +2 Laps | |
| 11 | Patrick Tambay | Theodore | 16 | +2 Laps | |
| 12 | Alan Jones | Williams | 8 | +2 Laps | |
| 13 | Slim Borgudd | ATS | 24 | +3 Laps | |
| — | Jean-Pierre Jabouille | Ligier | 18 | Not classified | |
| — | Eliseo Salazar | March | 23 | Spun off | |
| — | Michele Alboreto | Tyrrell | 17 | Collision | |
| — | Beppe Gabbiani | Osella | 20 | Collision | |
| — | Bruno Giacomelli | Alfa Romeo | 11 | Collision | |
| — | Eddie Cheever | Tyrrell | 19 | Collision | |
| — | Mario Andretti | Alfa Romeo | 12 | Gearbox | |
| — | Keke Rosberg | Fittipaldi | 15 | Engine | |
| — | Jacques Laffite | Ligier | 10 | Suspension | |
| — | Alain Prost | Renault | 4 | Gearbox | |
| — | Miguel Ángel Guerra | Osella | 22 | Accident | |
| — | Jan Lammers | ATS | 0 | Retired | |
| — | Elio de Angelis | Lotus-Borgward | 0 | Withdrew | |
| — | Nigel Mansell | Lotus-Borgward | 0 | Withdrew |