2003 World Superbike regular entries:
| no. | rider | entrant | bike |
| 4 | Troy Corser AUS | Foggy Petronas Racing | Foggy FP1 |
| 8 | James Haydon ENG | Foggy Petronas Racing | Foggy FP1 |
| 82 | Lorenzo Mauri ITA* | Foggy Petronas Racing | Foggy FP1 |
| 5 | Ivan Clementi ITA | Team Kawasaki Bertocchi | Kawasaki ZX-7RR |
| 6 | Mauro Sanchini ITA | Team Kawasaki Bertocchi | Kawasaki ZX-7RR |
| 7 | Pier-Francesco Chili ITA | Team PSG-1 | Ducati 998RS |
| 9 | Chris Walker ENG | HM Plant Ducati | Ducati 998RS F02 |
| 52 | James Toseland ENG | HM Plant Ducati | Ducati 998RS F02 |
| 10 | Gregorio Lavilla ESP | Team Alstare Suzuki | Suzuki GSX-R1000 |
| 31 | Vittorio Iannuzzo ITA** | Team Alstare Suzuki | Suzuki GSX-R1000 |
| 11 | Rubén Xaus ESP | Fila Ducati | Ducati 999RS F03 |
| 100 | Neil Hodgson ENG | Fila Ducati | Ducati 999RS F03 |
| 15 | Giovanni Bussei ITA | UnionBike GiMotorsport | Yamaha YZF-R1 |
| 51 | Davide Messori ITA* | UnionBike GiMotorsport | Yamaha YZF-R1 |
| 95 | Redamo Assirelli ITA* | UnionBike GiMotorsport | Yamaha YZF-R1 |
| 16 | Sergio Fuertes ESP | MIR Racing | Suzuki GSX-R1000 |
| 19 | Lucio Pedercini ITA | Team Pedercini | Ducati 998RS |
| 26 | Luca Pedersoli ITA* | Team Pedercini | Ducati 998RS |
| 28 | Serafino Foti ITA | Team Pedercini | Ducati 998RS |
| 35 | Nello Russo ITA | Team Pedercini | Ducati 998RS |
| 20 | Marco Borciani ITA | D.F.X. Racing Team | Ducati 998RS |
| 33 | Juan Borja ESP | D.F.X. Racing Team | Ducati 998RS |
| 99 | Steve Martin AUS | D.F.X. Racing Team | Ducati 998RS |
| 23 | Jiri Mrkyvka CSK | JM SBK Team | Ducati 998RS |
| 38 | Giancarlo de Matteis ITA* | Caracchi NCR Nortel Networks | Ducati 998RS |
| 48 | David García ESP | Team Caracchi NCR Nortel Networks | Ducati 998RS |
| 50 | Mario Masetti ITA* | Caracchi NCR Nortel Networks | Ducati 998RS |
| 55 | Régis Laconi FRA | Team Caracchi NCR Nortel Networks | Ducati 998RS |
| 91 | Walter Tortoroglio ITA | White Endurance Team | Honda VTR1000 SP-2 |
* substitute rider
** selected rounds only
tyres:
Most teams are running on Dunlop tyres. The exceptions are Foggy Petronas, Fila Ducati (both Michelin) and D.F.X. Racing (Pirelli).
Former champions: Troy Corser (1996)
Race winners:
23 · Troy Corser (1995 to 2001)
15 · Frankie Chili (1995 to 2001)
3 · Neil Hodgson (2000 to 2001)
2 · Hitoyasu Izutsu* (2000)
2 · Rubén Xaus (2001)
1 · Régis Laconi (2001)
* Izutsu is among the wildcard entries for Japan
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