2003 Australian Sports Sedan Championship
The 2003 Australian Sports Sedan Championship was a CAMS sanctioned national motor racing title open to Group 3D Sports Sedans. The title, which was the 19th Australian Sports Sedan Championship, was won by Kerry Baily driving a Nissan 300ZX Chevrolet.
Calendar
The championship was contested over a five-round series.| Round | Circuit | State | Date | Format | Round winner | Car |
| 1 | Wakefield Park Raceway | New South Wales | 22 & 23 February | Three races | Kerry Baily | Nissan 300ZX Chevrolet |
| 2 | Phillip Island Grand Prix Circuit | Victoria | 13 April | One race | Darren Hossack | Saab 9-3 Aero Chevrolet |
| 3 | Mallala Motor Sport Park | South Australia | 1 June | Three races | Tony Ricciardello | Alfa Romeo Alfetta GTV Chevrolet |
| 4 | Winton Motor Raceway | Victoria | 3 August | Two races | Darren Hossack | Saab 9-3 Aero Chevrolet |
| 5 | Sandown International Motor Raceway | Victoria | 13 & 14 September | Two races | Darren Hossack | Saab 9-3 Aero Chevrolet |
Points system
Championship points were awarded on a 20-17-15-14-13-12-11-10-9-8 basis for 1st through to 10th place in each race and an additional point was awarded to the driver setting the fastest time in Qualifying at each round.Cars complying with New Zealand Tranzam regulations were eligible to compete in championship races but were not eligible to score championship points.