The 1928 Australian Grand Prix was a motor race held on the Phillip Island road circuit, on Phillip Island, Victoria, Australia on 31 March 1928.

Although now known as the first Australian Grand Prix, the race was actually staged as the 100 Miles Road Race and it did not assume the Australian Grand Prix title until some years later.

[3] It was open to "light" cars of up to 2-litre capacity[3] and it attracted 30 entries, of which 25 were accepted and 17 started.

[3] The competitor setting the fastest time was to receive a £100 trophy donated by Charles Brown Kellow and would be regarded as "Champion of the Day".

[7] Although the 1928 race is recognised by Motorsport Australia as the first Australian Grand Prix,[11] a dispute exists given that an event held in Goulburn, New South Wales in 1927 was actually advertised as a grand prix at the time.