Alain Prost won the Monaco Grand Prix 1985 at Circuit de Monaco on 19 May 1985, starting from P5 on the grid. Michele Alboreto finished second for Ferrari, with Elio de Angelis completing the podium for Team Lotus.
| Pos | Grid | Driver | Team | Laps | Time / Status | Pts | FL |
|---|---|---|---|---|---|---|---|
| 1 | 5 | Alain ProstPRO | McLaren | 78 | 1:51:58.034 | 9 | |
| 2 | 3 | Michele AlboretoALB | Ferrari | 78 | +7.541 | 6 | |
| 3 | 9 | Elio de AngelisDEA | Team Lotus | 78 | +1:27.171 | 4 | |
| 4 | 8 | Andrea de CesarisDEC | Ligier | 77 | +1 Lap | 3 | |
| 5 | 10 | Derek WarwickWAR | Renault | 77 | +1 Lap | 2 | |
| 6 | 16 | Jacques LaffiteLAF | Ligier | 77 | +1 Lap | 1 | |
| 7 | 2 | Nigel MansellMAN | Williams | 77 | +1 Lap | 0 | |
| 8 | 7 | Keke RosbergROS | Williams | 76 | +2 Laps | 0 | |
| 9 | 6 | Thierry BoutsenBOU | Arrows | 76 | +2 Laps | 0 | |
| 10 | 18 | Martin BrundleBRU | Tyrrell | 74 | +4 Laps | 0 | |
| 11 | 19 | Jonathan PalmerPAL | Zakspeed | 74 | +4 Laps | 0 | |
| R | 14 | Niki LaudaLAU | McLaren | 17 | Spun off | 0 | |
| R | 12 | Riccardo PatresePAT | Alfa Romeo | 16 | Accident | 0 | |
| R | 13 | Nelson PiquetPIQ | Brabham | 16 | Accident | 0 | |
| R | 20 | Teo FabiFAB | Toleman | 16 | Turbo | 0 | |
| R | 1 | Ayrton SennaSEN | Team Lotus | 13 | Engine | 0 | |
| R | 4 | Eddie CheeverCHE | Alfa Romeo | 10 | Alternator | 0 | |
| R | 15 | Stefan JohanssonJOH | Ferrari | 1 | Accident | 0 | |
| R | 11 | Gerhard BergerBER | Arrows | 0 | Accident | 0 | |
| R | 17 | Patrick TambayTAM | Renault | 0 | Accident | 0 | |
| F | 0 | Piercarlo GhinzaniGHI | Osella | 0 | Did not qualify | 0 | |
| F | 0 | Stefan BellofBEL | Tyrrell | 0 | Did not qualify | 0 | |
| F | 0 | Philippe AlliotALL | RAM | 0 | Did not qualify | 0 | |
| F | 0 | Manfred WinkelhockWIN | RAM | 0 | Did not qualify | 0 | |
| F | 0 | François HesnaultHES | Brabham | 0 | Did not qualify | 0 |