The 1939 Australian Grand Prix was a motor race held on the Lobethal Circuit in South Australia, Australia on 2 January 1939. The race was staged over 17 laps of the 14 kilometre circuit, the longest ever used for the Grand Prix, for a race distance of 241 kilometres. The Grand Prix meeting was organised by Lobethal Carnivals Ltd. and the Sporting Car Club of South Australia. The entry of J O'Dea crashed at the Gumeracha turn late in the race and driver Vern Leech was killed almost instantaneously.