Race Result
| GP n. 344 - 29/03/1981 - Grand Prix of Brazil Jacarepagua |
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| Winner: | Carlos Reutemann / Williams-Ford - 2:00'23.66 | ||||||
| Pole Position: | Nelson Piquet / Brabham-Ford - 1:35.079 | ||||||
| Fastest Lap: | Marc Surer / Ensign-Ford - 1:54.302 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 2 | Williams-Ford | 62 | 2:00'23.66 | 2 | 9 | |
| 2 | 1 | Williams-Ford | 62 | + 4.44 | 3 | 6 | |
| 3 | 29 | Arrows-Ford | 62 | + 1'03.08 | 4 | 4 | |
| 4 | 14 | Ensign-Ford | 62 | + 1'17.03 | 18 | 3 | |
| 5 | 11 | Lotus-Ford | 62 | + 1'26.42 | 10 | 2 | |
| 6 | 26 | Ligier-Matra | 62 | + 1'26.83 | 16 | 1 | |
| 7 | 25 | Ligier-Matra | 62 | + 1'30.25 | 23 | 0 | |
| 8 | 7 | McLaren-Ford | 61 | + 1 lap | 15 | 0 | |
| 9 | 20 | Fittipaldi-Ford | 61 | + 1 lap | 12 | 0 | |
| 10 | 33 | Theodore-Ford | 61 | + 1 lap | 19 | 0 | |
| 11 | 12 | Lotus-Ford | 61 | + 1 lap | 13 | 0 | |
| 12 | 5 | Brabham-Ford | 60 | + 2 laps | 1 | 0 | |
| 13 | 4 | Tyrrell-Ford | 57 | + 5 laps | 24 | 0 | |
| Nc | 3 | Tyrrell-Ford | 49 | not classified | 14 | 0 | |
| Nc | 23 | Alfa Romeo | 40 | not classified | 6 | 0 | |
| Ret | 27 | Ferrari | 25 | turbo | 7 | 0 | |
| Ret | 6 | Brabham-Ford | 22 | spun off | 11 | 0 | |
| Ret | 30 | Arrows-Ford | 20 | accident | 21 | 0 | |
| Ret | 15 | Renault | 20 | collision | 5 | 0 | |
| Ret | 28 | Ferrari | 19 | collision | 17 | 0 | |
| Ret | 8 | McLaren-Ford | 9 | engine | 20 | 0 | |
| Ret | 22 | Alfa Romeo | 0 | collision | 9 | 0 | |
| Ret | 21 | Fittipaldi-Ford | 0 | collision | 22 | 0 | |
| Ret | 16 | Renault | 0 | collision | 8 | 0 | |
| Dnq | 9 | ATS-Ford | did not qualify | 0 | |||
| Dnq | 13 | Ensign-Ford | did not qualify | 0 | |||
| Dnq | 17 | March-Ford | did not qualify | 0 | |||
| Dnq | 18 | March-Ford | did not qualify | 0 | |||
| Dnq | 31 | Osella-Ford | did not qualify | 0 | |||
| Dnq | 32 | Osella-Ford | did not qualify | 0 | |||