Ayrton Senna won the Belgian Grand Prix 1985 at Circuit de Spa-Francorchamps on 15 September 1985, starting from P2 on the grid. Nigel Mansell finished second for Williams, with Alain Prost completing the podium for McLaren.
| Pos | Grid | Driver | Team | Laps | Time / Status | Pts | FL |
|---|---|---|---|---|---|---|---|
| 1 | 2 | Ayrton SennaSEN | Team Lotus | 43 | 1:34:19.893 | 9 | |
| 2 | 7 | Nigel MansellMAN | Williams | 43 | +28.422 | 6 | |
| 3 | 1 | Alain ProstPRO | McLaren | 43 | +55.109 | 4 | |
| 4 | 10 | Keke RosbergROS | Williams | 43 | +1:15.290 | 3 | |
| 5 | 3 | Nelson PiquetPIQ | Brabham | 42 | +1 Lap | 2 | |
| 6 | 14 | Derek WarwickWAR | Renault | 42 | +1 Lap | 1 | |
| 7 | 8 | Gerhard BergerBER | Arrows | 42 | +1 Lap | 0 | |
| 8 | 12 | Marc SurerSUR | Brabham | 42 | +1 Lap | 0 | |
| 9 | 18 | Philippe StreiffSTR | Ligier | 42 | +1 Lap | 0 | |
| 10 | 9 | Thierry BoutsenBOU | Arrows | 40 | +3 Laps | 0 | |
| 11 | 17 | Jacques LaffiteLAF | Ligier | 38 | Accident | 0 | |
| 12 | 24 | Pierluigi MartiniMAR | Minardi | 38 | +5 Laps | 0 | |
| 13 | 21 | Martin BrundleBRU | Tyrrell | 38 | +5 Laps | 0 | |
| N | 23 | Huub RothengatterROT | Osella | 37 | Not classified | 0 | |
| R | 15 | Riccardo PatresePAT | Alfa Romeo | 31 | Engine | 0 | |
| R | 19 | Eddie CheeverCHE | Alfa Romeo | 26 | Gearbox | 0 | |
| R | 13 | Patrick TambayTAM | Renault | 24 | Gearbox | 0 | |
| R | 11 | Teo FabiFAB | Toleman | 23 | Throttle | 0 | |
| R | 9 | Elio de AngelisDEA | Team Lotus | 17 | Turbo | 0 | |
| R | 22 | Christian DannerDAN | Zakspeed | 16 | Gearbox | 0 | |
| R | 20 | Philippe AlliotALL | RAM | 10 | Accident | 0 | |
| R | 5 | Stefan JohanssonJOH | Ferrari | 7 | Spun off | 0 | |
| R | 16 | Piercarlo GhinzaniGHI | Toleman | 7 | Accident | 0 | |
| R | 4 | Michele AlboretoALB | Ferrari | 3 | Clutch | 0 |