The 1987 Monaco Grand Prix (formally the 45e Grand Prix de Monaco) was a Formula One motor race held on 31 May 1987 at the Circuit de Monaco, Monte Carlo. It was the fourth race of the 1987 FIA Formula One World Championship.
The 78-lap race was won by Ayrton Senna, driving a Lotus-Honda. It was the first of an eventual six wins for the Brazilian driver at Monaco. Compatriot Nelson Piquet was second in a Williams-Honda, with Italian Michele Alboreto third in a Ferrari.