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Local hero Charles Leclerc was fastest in the opening hour of practice in Monaco.
| Pos | Num | Driver | Team | Laps | Time | Diff |
| 1 | 16 | Charles Leclerc | Scuderia Ferrari | 29 | 1:14.531 | |
| 2 | 11 | Sergio Perez | Red Bull Racing | 30 | 1:14.570 | +0.039s |
| 3 | 55 | Carlos Sainz | Scuderia Ferrari | 28 | 1:14.601 | +0.070s |
| 4 | 1 | Max Verstappen | Red Bull Racing | 26 | 1:14.712 | +0.181s |
| 5 | 4 | Lando Norris | McLaren F1 Team | 31 | 1:15.056 | +0.525s |
| 6 | 10 | Pierre Gasly | Scuderia AlphaTauri | 33 | 1:15.083 | +0.552s |
| 7 | 3 | Daniel Ricciardo | McLaren F1 Team | 33 | 1:15.157 | +0.626s |
| 8 | 63 | George Russell | Mercedes-AMG F1 Team | 34 | 1:15.211 | +0.680s |
| 9 | 5 | Sebastian Vettel | Aston Martin F1 Team | 33 | 1:15.387 | +0.856s |
| 10 | 44 | Lewis Hamilton | Mercedes-AMG F1 Team | 29 | 1:15.499 | +0.968s |
| 11 | 22 | Yuki Tsunoda | Scuderia AlphaTauri | 36 | 1:15.536 | +1.005s |
| 12 | 18 | Lance Stroll | Aston Martin F1 Team | 26 | 1:15.539 | +1.008s |
| 13 | 14 | Fernando Alonso | Alpine F1 Team | 28 | 1:15.749 | +1.218s |
| 14 | 20 | Kevin Magnussen | Haas F1 Team | 30 | 1:15.806 | +1.275s |
| 15 | 23 | Alex Albon | Williams Racing | 39 | 1:16.110 | +1.579s |
| 16 | 31 | Esteban Ocon | Alpine F1 Team | 24 | 1:16.315 | +1.784s |
| 17 | 24 | Zhou Guanyu | Alfa Romeo F1 Team | 27 | 1:16.417 | +1.886s |
| 18 | 6 | Nicholas Latifi | Williams Racing | 30 | 1:17.714 | +3.183s |
| 19 | 47 | Mick Schumacher | Haas F1 Team | 12 | 1:18.636 | +4.105s |
| 20 | 77 | Valtteri Bottas | Alfa Romeo F1 Team | 2 |
