The 2003 Telefónica World Series by Nissan was contested over 9 race weekends/18 rounds.
In this one-make formula all drivers had to use the Dallara chassis (Dallara SN01) and Nissan engines (Nissan VQ).
[1] Every second race saw a mandatory pit stop.
Lower placed drivers did not award points.
Additional points were awarded to the driver setting the fastest race lap (2 points).