Zolder · 17 May 1981
Carlos Reutemann won the 1981 Belgian Grand Prix for Williams from 1st on the grid, 36.06s ahead of Jacques Laffite. Piercarlo Ghinzani gained the most places, from 24th on the grid to 13th.
| Pos | Team | Points Breakdown | Pts | |
|---|---|---|---|---|
| 1 | Williams Reutemann 9 + Jones 0 | Reutemann 9 + Jones 0 | 9 | |
| 2 | Ligier Laffite 6 + Jabouille 0 | Laffite 6 + Jabouille 0 | 6 | |
| 3 | Team Lotus Mansell 4 + de Angelis 2 | Mansell 4 + de Angelis 2 | 6 | |
| 4 | Ferrari Villeneuve 3 + Pironi 0 | Villeneuve 3 + Pironi 0 | 3 | |
| 5 | Tyrrell Cheever 1 + Alboreto 0 | Cheever 1 + Alboreto 0 | 1 | |
| 6 | McLaren Watson 0 + de Cesaris 0 | Watson 0 + de Cesaris 0 | 0 | |
| 7 | Alfa Romeo Giacomelli 0 + Andretti 0 | Giacomelli 0 + Andretti 0 | 0 | |
| 8 | Ensign Surer 0 | Surer 0 | 0 | |
| 9 | Osella Ghinzani 0 + Gabbiani 0 | Ghinzani 0 + Gabbiani 0 | 0 | |
| 10 | Brabham Rebaque 0 + Piquet 0 | Rebaque 0 + Piquet 0 | 0 | |
| 11 | Fittipaldi Serra 0 + Rosberg 0 | Serra 0 + Rosberg 0 | 0 | |
| 12 | Renault Prost 0 | Prost 0 | 0 | |
| 13 | Arrows Patrese 0 + Stohr 0 | Patrese 0 + Stohr 0 | 0 |
| Pos | Driver | Team | Race time / Gap | Laps | Stops | Pts | |
|---|---|---|---|---|---|---|---|
| 1 | Carlos Reutemann Williams | Williams | 1:16:31.610 | 54 | — | 9 | |
| 2 | Jacques Laffite Ligier | Ligier | +36.060s | 54 | — | 6 | |
| 3 | Nigel Mansell Team Lotus | Team Lotus | +43.690s | 54 | — | 4 | |
| 4 | Gilles Villeneuve Ferrari | Ferrari | +47.640s | 54 | — | 3 | |
| 5 | Elio de Angelis Team Lotus | Team Lotus | +49.200s | 54 | — | 2 | |
| 6 | Eddie Cheever Tyrrell | Tyrrell | +52.510s | 54 | — | 1 | |
| 7 | John Watson McLaren | McLaren | +1:01.660 | 54 | — | — | |
| 8 | Didier Pironi Ferrari | Ferrari | +1:32.040 | 54 | — | — | |
| 9 | Bruno Giacomelli Alfa Romeo | Alfa Romeo | +1:35.580 | 54 | — | — | |
| 10 | Mario Andretti Alfa Romeo | Alfa Romeo | +1 Lap | 53 | — | — | |
| 11 | Marc Surer Ensign | Ensign | +2 Laps | 52 | — | — | |
| 12 | Michele Alboreto Tyrrell | Tyrrell | +2 Laps | 52 | — | — | |
| 13 | Piercarlo Ghinzani Osella | Osella | +4 Laps | 50 | — | — | |
| DNF | Hector Rebaque Brabham | Brabham | DNF Accident | 39 | — | — | |
| DNF | Jean-Pierre Jabouille Ligier | Ligier | DNF Transmission | 35 | — | — | |
| DNF | Chico Serra Fittipaldi | Fittipaldi | DNF Engine | 29 | — | — | |
| DNF | Beppe Gabbiani Osella | Osella | DNF Engine | 22 | — | — | |
| DNF | Alan Jones Williams | Williams | DNF Accident | 19 | — | — | |
| DNF | Andrea de Cesaris McLaren | McLaren | DNF Gearbox | 11 | — | — | |
| DNF | Nelson Piquet Brabham | Brabham | DNF Accident | 10 | — | — | |
| DNF | Keke Rosberg Fittipaldi | Fittipaldi | DNF Gearbox | 10 | — | — | |
| DNF | Alain Prost Renault | Renault | DNF Clutch | 2 | — | — | |
| DNF | Riccardo Patrese Arrows | Arrows | DNF Collision | 0 | — | — | |
| DNF | Siegfried Stohr Arrows | Arrows | DNF Collision | 0 | — | — |