The 2003 Konica V8 Supercar Series was an Australian motor racing competition held for V8 Supercars. It was the fourth V8 Supercar Development Series. The series began on 23 February 2003 at Wakefield Park and finished on 31 August at Mallala Motor Sport Park after sixteen races at six rounds held across three different states.
Series winner Mark Winterbottom won eight of the 16 races and four of the six rounds. The new points system placed an increased emphasis on finishing races and series runner up Matthew White scored just 58 points less than Winterbottom, despite taking only two race wins and six top three race finishes.