1991 Formula One season Drivers and constructors Drivers and constructors

| Entrant | Constructor_ | Chassis | Engine | Tyre | Driver | Rounds |
|---|---|---|---|---|---|---|
| Automobiles Gonfaronaise Sportive | AGS - Ford | JH25 JH25B JH27 | Ford Cosworth DFR 3.5 V8 | G | Fabrizio Barbazza | 3-14 |
| Camel Benetton Ford | Benetton - Ford | B190B B191 | Ford HB5 3.5 V8 | P | Roberto Moreno | 1-11 |
| Camel Benetton Ford | Benetton - Ford | B190B B191 | Ford HB5 3.5 V8 | P | Michael Schumacher | 12-16 |
| Camel Benetton Ford | Benetton - Ford | B190B B191 | Ford HB5 3.5 V8 | P | Nelson Piquet | All |
| Scuderia Italia | Dallara - Judd | 191 | Judd GV 3.5 V10 | P | Emanuele Pirro | All |
| Scuderia Italia | Dallara - Judd | 191 | Judd GV 3.5 V10 | P | JJ Lehto | All |
| Minardi Team | Minardi - Ferrari | M191 | Ferrari 037 3.5 V12 | G | Pierluigi Martini | All |