Supercars Challenge (event)

The Supercars Challenge was an annual non-championship motor racing event held for cars from the Supercars Championship, and formerly from V8 Supercars, the Shell Championship Series and the Australian Touring Car Championship. The event was held on the Albert Park Circuit in Albert Park, Victoria, Australia as a support event to the Australian Grand Prix.

First held as a Formula One World Championship support race in 1985, the event was originally held at the Adelaide Street Circuit until the Australian Grand Prix moved to Melbourne for 1996. From 2018 onwards, the event was contested for championship points and became known as the Melbourne 400.