The 1963 Belgian Grand Prix was a Formula One motor race, held at Spa-Francorchamps on 9 June 1963. It was race 2 of 10 in both the 1963 World Championship of Drivers and the 1963 International Cup for Formula One Manufacturers. Jim Clark won the race in extremely wet and rainy conditions. After starting eighth on the grid Clark passed all of the cars in front of him, including early leader Graham Hill. At the end of the race, Clark had not only lapped the entire field except for Bruce McLaren, but the margin to the second-placed Cooper driver was almost five minutes. The Scot's performance was made even more impressive by the fact that gearbox issues meant that he had to hold his gear lever in place, thus driving one-handed, whenever fifth gear was selected on this high-speed circuit. Given the rainy conditions, Clark eventually chose not to engage fifth gear at all, leaving him with only four gears. This would be the first of seven victories for Clark and Team Lotus that year.

The 1963 Formula One season was the 17th season of FIA Formula One motor racing. It featured the 14th World Championship of Drivers, the 6th International Cup for F1 Manufacturers, and numerous non-championship Formula One races. The World Championship was contested over ten races between 26 May and 28 December 1963.