The 1991 Australian Touring Car Championship was a CAMS sanctioned motor racing title open to Group 3A Touring Cars. The title, which was the 32nd Australian Touring Car Championship, was contested over a nine-round series which began on 24 February 1991 at Sandown Raceway and ended on 11 August at Oran Park Raceway, The series was promoted as the Shell Australian Touring Car Championship and was won by Jim Richards driving a Nissan Skyline GT-R.

Oran Park Raceway was a motor racing circuit at Narellan south west of Sydney, New South Wales, Australia which was operational from February 1962 until its closure in January 2010. The track was designed and started by George Murray and Jack Allen. Since its closure in 2010 it has been (re)developed into housing.