The 1966 Monaco Grand Prix, officially known as the XXIV Grand Prix Automobile de Monaco, was the opening round of the 1966 FIA Formula One World Championship, held on the Circuit de Monaco on the 22nd of May, 1966. The race, which saw Team Lotus and Jim Clark arrive to open the defence of their 1965, was the first race of the three litre era of Formula One, introduced for the 1966 season.