F1 fastest laps
Fastest laps
| # | Grand Prix | Circuit | Driver | Constructor |
|---|---|---|---|---|
| 1 | Australia | Melbourne | (FIN) Kimi Raikkonen | McLaren-Mercedes |
| 2 | Malaysia | Sepang | (DEU) Michael Schumacher | Ferrari |
| 3 | Brazil | Interlagos | (BRA) Rubens Barrichello | Ferrari |
| 4 | San Marino | Imola | (DEU) Michael Schumacher | Ferrari |
| 5 | Spain | Catalunya | (BRA) Rubens Barrichello | Ferrari |
| 6 | Austria | Spielberg | (DEU) Michael Schumacher | Ferrari |
| 7 | Monaco | Monte Carlo | (FIN) Kimi Raikkonen | McLaren-Mercedes |
| 8 | Canada | Montreal | (ESP) Fernando Alonso | Renault |
| 9 | Europe | Nurburgring | (FIN) Kimi Raikkonen | McLaren-Mercedes |
| 10 | France | Magny-Cours | (COL) Juan Pablo Montoya | Williams-BMW |
| 11 | Britain | Silverstone | (BRA) Rubens Barrichello | Ferrari |
| 12 | Germany | Hockenheim | (COL) Juan Pablo Montoya | Williams-BMW |
| 13 | Hungary | Hungaroring | (COL) Juan Pablo Montoya | Williams-BMW |
| 14 | Italy | Monza | (DEU) Michael Schumacher | Ferrari |
| 15 | USA | Indianapolis | (DEU) Michael Schumacher | Ferrari |
| 16 | Japan | Suzuka | (DEU) Ralf Schumacher | Williams-BMW |
- First fastest lap (drivers)
- Fernando Alonso (first Spanish driver to set a fastest lap)
- Last fastest lap (drivers)
- No drivers set their last fastest lap in 2003
- First fastest lap (constructors)
- No constructor set their first fastest lap in 2003
- Last fastest lap (constructors)
- No constructor set their last fastest lap in 2003
- First fastest lap since…
- 1984 for Renault
- 2001 for Ralf Schumacher
- Last fastest lap until…
- 2005 for Fernando Alonso, Ralf Schumacher and Renault
- Last fastest lap by a…
- Spanish driver until 2005