1981 San Marino Grand Prix
🇮🇹 Italy Autodromo Enzo e Dino Ferrari, Imola, Italy Round 4 of 15
Constructors' Championship
| Pos | Team | Pts | Wins |
|---|---|---|---|
| 1 | Williams | 39 | 2 |
| 2 | Brabham | 13 | 1 |
| 3 | Renault | 6 | 0 |
| 4 | Arrows | 4 | 0 |
| 5 | Alfa Romeo | 3 | 0 |
| 6 | Ensign | 3 | 0 |
| 7 | Team Lotus | 3 | 0 |
| 8 | Tyrrell | 2 | 0 |
| 9 | Ligier | 1 | 0 |
| 10 | Theodore | 1 | 0 |
| — | Fittipaldi | 0 | 0 |
| — | McLaren | 0 | 0 |
| — | ATS | 0 | 0 |
| — | Ferrari | 0 | 0 |
| — | Osella | 0 | 0 |