Tercera sesión de entrenamientos libres del Gran Premio de Bélgica 2021
| Pos. | Piloto | Escuderia | Tiempo | Vueltas |
|---|---|---|---|---|
| 1 |  Max Verstappen |
Red Bull | 1:56.924 | 10 |
| 2 |  Sergio Pérez |
Red Bull | +0.947s | 7 |
| 3 |  Lewis Hamilton |
Mercedes | +1.072s | 9 |
| 4 |  Lando Norris |
McLaren | +1.585s | 11 |
| 5 |  Esteban Ocon |
Alpine | +1.989s | 15 |
| 6 |  Lance Stroll |
Aston Martin | +2.281s | 16 |
| 7 | Pierre Gasly |
Alpha Tauri | +2.400s | 14 |
| 8 |  Sebastian Vettel |
Aston Martin | +2.512s | 15 |
| 9 | George Russell |
Williams | +2.568s | 9 |
| 10 |  Fernando Alonso |
Alpine | +2.689s | 16 |
| 11 |  Valtteri Bottas |
Mercedes | +2.884s | 14 |
| 12 | Nicholas Latifi |
Williams | +3.057s | 11 |
| 13 |  Daniel Ricciardo |
McLaren | +3.532s | 13 |
| 14 | Carlos Sainz Jr. |
Ferrari | +3.825s | 17 |
| 15 | Mick Schumacher |
Haas | +4.345s | 18 |
| 16 |  Charles Leclerc |
Ferrari | +4.446s | 14 |
| 17 |  Yuki Tsunoda |
Alpha Tauri | +4.586s | 20 |
| 18 |  Antonio Giovinazzi |
Alfa Romeo | +4.588s | 20 |
| 19 |  Nikita Mazepin |
Haas | +4.868s | 19 |
| 20 | Kimi Räikkönen |
Alfa Romeo | +7.458s | 3 |