The 2005 Canadian Grand Prix was a Formula One motor race held on 12 June 2005 at the Circuit Gilles Villeneuve in Montreal, Quebec, Canada. The 70-lap race was the eighth round of the 2005 Formula One season, the 43rd running of the Canadian Grand Prix, and the 37th running as a round of the World Championship. It set a ratings record and was the most watched F1 race in history. It was also the first of two consecutive North American rounds. The race was won by McLaren driver Kimi Räikkönen, taking his third win from four races. The two Ferrari cars completed the podium, with Michael Schumacher in second place and Rubens Barrichello in third. Both Renaults failed to finish the race, but the team maintained their lead in the Constructors' Championship; their driver, Fernando Alonso also kept his lead in the Drivers' Championship, despite the gap between himself and nearest rival Räikkönen closing by ten points.

The Circuit Gilles Villeneuve, also spelled Circuit Gilles-Villeneuve, is a 4.361 km (2.710 mi) motor racing circuit on Notre Dame Island in Montreal, Quebec, Canada. It is the venue for the FIA Formula One Canadian Grand Prix. It has previously hosted the FIA World Sportscar Championship, the Champ Car World Series, the NASCAR Pinty’s Series, the NASCAR Xfinity Series, and the Grand-Am Rolex Sports Car Series.