GT4 Australia
GT4 Australia (known commercially as Monochrome GT4 Australia for 2024–2025) is a motor racing series for SRO GT4-class grand touring cars. The series is promoted by the SRO Motorsports Group, who are the global owner of the category, and also promote the GT World Challenge Australia for SRO GT3 cars.
The first series ran in 2024, after GT4 cars had previously run in the Australian Production Car Championship. In 2024, the series ran as part of the SpeedSeries events promoted by Motorsport Australia. For 2025, SRO has taken over as event promoter and the series will run on events headlined by the World Challenge Australia.