2025 AU4 Australian Championship

The 2025 AU4 Australian Championship is an upcoming motor racing series in Australia for Formula 4 cars. The series was previously known as the Formula 4 Australian Championship. It will be the seventh national championship in Formula 4, and the first under the name of AU4.

The series is sanctioned by Motorsport Australia.

Globally, Formula 4 is the first step out of karting on the FIA Global Pathway from Karting to Formula One. It is no longer the only series on the pathway run in Australia, with the introduction of Formula Regional Australia in 2025.