The 2021 Gulf Western Oils Touring Car Masters was an Australian motor racing competition for touring cars manufactured between 1 January 1963 and the 31 December 1980 and IROC Porsche Class Automobiles, which had been modified in accordance with the series regulations. It was sanctioned by Motorsport Australia as an Authorised Series, with TCM Racing Pty. Ltd appointed as the Category Manager for the series. John Bowe won the series, his sixth Touring Car Masters title.