The 2005 V8 Supercar Championship Series was a motor racing championship for V8 Supercars. The series, which was the seventh V8 Supercar Championship Series, began on 18 March 2005 in Adelaide and ended on 27 November at Phillip Island Grand Prix Circuit after 13 rounds. The 46th Australian Touring Car Championship title was awarded to the series winner, Russell Ingall by the Confederation of Australian Motor Sport.

The following drivers and teams competed in the 2005 championship.

* = Drove in Sandown 500 only. ** = Drove in Bathurst 1000 only.

The 2005 V8 Supercar Championship Series was contested over 13 rounds, including eleven single-driver 'sprint' rounds and two two-driver 'endurance' rounds.

Points were awarded on the results of each race as follows.

(S) denotes a single car team.

Ford was awarded the Champion Manufacturer title, having achieved the most round wins during the series.