1931 Monaco Grand Prix Entries Entries

| Driver | Entrant | Constructor_ | Chassis | Engine |
|---|---|---|---|---|
| Louis Chiron | Automobiles Ettore Bugatti | Bugatti | Bugatti T51 | 2.3 L8 |
| Albert Divo | Automobiles Ettore Bugatti | Bugatti | Bugatti T51 | 2.3 L8 |
| Achille Varzi | Automobiles Ettore Bugatti | Bugatti | Bugatti T51 | 2.3 L8 |
| Philippe Étancelin | Private entry | Bugatti | Bugatti T35C | 2.0 L8 |
| Stanislas Czaykowski | Private entry | Bugatti | Bugatti T35B | 2.3 L8 |
| Marcel Lehoux | Private entry | Bugatti | Bugatti T35B | 2.3 L8 |
| William Grover-Williams | Private entry | Bugatti | Bugatti T35C | 2.0 L8 |
| Boris Ivanowski | Private entry | Mercedes-Benz | Mercedes-Benz SSK | 7.1 L6 |
| André Boillot | Private entry | Peugeot | Peugeot 174S | 4.0 L4 |
| Luigi Arcangeli | SA Alfa Romeo | Alfa Romeo | Alfa Romeo 6C-1750 | 1.8 L6 |
| Baconin Borzacchini | SA Alfa Romeo | Alfa Romeo | Alfa Romeo 6C-1750 | 1.8 L6 |