The 2025 GT4 Australia Series (commercially titled 2025 Monochrome GT4 Australia Series) was an Australian motorsport competition for GT4 cars. The championship was the 2nd season of a standalone GT4 Australia series having split from the Australian Production Car Series at the end of 2023, and was the second season of the championship being solely managed by the SRO Motorsports Group. The season began on 4 April at Phillip Island Grand Prix Circuit and finished on 2 November at the Hampton Downs Motorsport Park.
The provisional six-race meeting calendar was released on 28 June 2024 with 5 rounds to take place in Australia and 1 round to take place in New Zealand. It includes 6 race weekends in support of the 2025 GT World Challenge Australia.
Bold indicates overall winner