The Holden Commodore (ZB) is the final generation of the Holden Commodore range produced by now-defunct Australian brand Holden from 2018 to 2020.

The 2019 Supercars Championship was the twenty-first running of the Supercars Championship and the twenty-third series in which Supercars have contested the Australian Touring Car Championship, the premier title in Australian motorsport. The 2019 championship also included the running of the 1,000th Australian Touring Car Championship race, which was contested at the Melbourne 400.