The 1986 Canadian Grand Prix was a Formula One motor race held at Circuit Gilles Villeneuve, Montreal on 15 June 1986.

The 69-lap race was won from pole position by Briton Nigel Mansell, driving a Williams-Honda.

Frenchman Alain Prost finished second in a McLaren-TAG, with Mansell's Brazilian teammate Nelson Piquet third.

Prost took the lead of the Drivers' Championship by two points from Mansell and another Brazilian, Ayrton Senna, who finished fifth in his Lotus-Renault.

This would prove to be the final Canadian Grand Prix held on the circuit in its original configuration with the pits and start/finish straight coming out of the Epingle de Casino Hairpin.