2003 Formula One season Drivers and constructors Drivers and constructors

| Entrant | Constructor_ | Chassis | Engine_ | Tyre | Driver | Rounds | Free_Practice_drivers |
|---|---|---|---|---|---|---|---|
| West McLaren Mercedes | McLaren - Mercedes | MP4-17D | Mercedes FO110M Mercedes FO110P | M | Kimi Räikkönen | All | N/A |
| Mild Seven Renault F1 Team | Renault | R23 R23B | Renault RS23 | M | Jarno Trulli | All | Allan McNish Franck Montagny |
| Mild Seven Renault F1 Team | Renault | R23 R23B | Renault RS23 | M | Fernando Alonso | All | Allan McNish Franck Montagny |
| Sauber Petronas | Sauber - Petronas | C22 | Petronas 03A | B | Nick Heidfeld | All | N/A |
| Sauber Petronas | Sauber - Petronas | C22 | Petronas 03A | B | Heinz-Harald Frentzen | All | N/A |
| Jordan Ford | Jordan - Ford | EJ13 | Ford RS1 | B | Giancarlo Fisichella | All | Zsolt Baumgartner Björn Wirdheim Satoshi Motoyama |
| Jordan Ford | Jordan - Ford | EJ13 | Ford RS1 | B | Ralph Firman | 1–12, 15–16 | Zsolt Baumgartner Björn Wirdheim Satoshi Motoyama |