| Spa-Francorchamps | |
| Round No: | 5 |
| Season No: | 7 |
| Year: | 2021 |
| Country: | Belgium |
| Location: | Circuit de Spa-Francorchamps Stavelot, Belgium |
| Course: | Permanent Circuit |
| Course Mi: | 4.352 |
| Course Km: | 7.004 |
| Type R1: | Sprint race 1 |
| Date R1: | 28 August |
| Laps R1: | 15 |
| First Driver Country R1: | ITA |
| First Driver R1: | Lorenzo Colombo |
| First Team R1: | Campos Racing |
| Second Driver Country R1: | USA |
| Second Driver R1: | Jak Crawford |
| Second Team R1: | Hitech Grand Prix |
| Third Driver Country R1: | CZE |
| Third Driver R1: | Roman Staněk |
| Third Team R1: | Hitech Grand Prix |
| Fast Driver Country R1: | ITA |
| Fast Driver R1: | Lorenzo Colombo |
| Fast Team R1: | Campos Racing |
| Fast Time R1: | 2:22.799 |
| Fast Lap R1: | lap 11 |
| Type R2: | Sprint race 2 |
| Date R2: | 28 August |
| Laps R2: | 16 |
| First Driver Country R2: | AUS |
| First Driver R2: | Jack Doohan |
| First Team R2: | Trident |
| Second Driver Country R2: | GER |
| Second Driver R2: | David Schumacher |
| Second Team R2: | Trident |
| Third Driver Country R2: | USA |
| Third Driver R2: | Logan Sargeant |
| Third Team R2: | Charouz Racing System |
| Fast Driver Country R2: | FRA |
| Fast Driver R2: | Clément Novalak |
| Fast Team R2: | Trident |
| Fast Time R2: | 2:24.940 |
| Fast Lap R2: | 9 |
| Type R3: | Feature race |
| Date R3: | 29 August |
| Laps R3: | 14 |
| Pole Driver Country R3: | AUS |
| Pole Driver R3: | Jack Doohan |
| Pole Team R3: | Trident |
| Pole Time R3: | 2:21.953 |
| First Driver Country R3: | AUS |
| First Driver R3: | Jack Doohan |
| First Team R3: | Trident |
| Second Driver Country R3: | FRA |
| Second Driver R3: | Victor Martins |
| Second Team R3: | MP Motorsport |
| Third Driver Country R3: | RUS |
| Third Driver R3: | Aleksandr Smolyar |
| Third Team R3: | ART Grand Prix |
| Fast Driver Country R3: | ITA |
| Fast Driver R3: | Matteo Nannini |
| Fast Team R3: | HWA Racelab |
| Fast Time R3: | 1:42.442 |
| Fast Lap R3: | lap 17 |
The 2021 Spa-Francorchamps Formula 3 round was the fifth round of the 2021 FIA Formula 3 Championship. It took place at the Circuit de Spa-Francorchamps and featured three races on the 28 August and 29 August in support of the 2021 Belgian Grand Prix.
With Jack Doohan winning both Sprint Race 2 and Feature Race respectively, it marked the first time in the series' history that a driver was able to win two races in a weekend.
| Driver | Points | |||
|---|---|---|---|---|
| 1 |  Dennis Hauger | 158 | ||
| 2 |  Jack Doohan | 133 | ||
| 1 | 3 |  Frederik Vesti | 101 | |
| 3 | 4 |  Victor Martins | 96 | |
| 5 |  Aleksandr Smolyar | 92 |
| Team | Points | |||
|---|---|---|---|---|
| 1 |  Prema Racing | 290 | ||
| 2 | Trident | 274 | ||
| 3 | ART Grand Prix | 202 | ||
| 4 | MP Motorsport | 159 | ||
| 5 |  Hitech Grand Prix | 86 |
