John Bernard Mackey, VC was an Australian recipient of the Victoria Cross, the highest award for gallantry in the face of the enemy that can be awarded to British Commonwealth forces. Mackey was one of twenty Australians to receive the award for actions during the Second World War, receiving his award posthumously for leading an attack on against a strongly defended Japanese position during the Battle of Tarakan in May 1945. He was 22 and serving as a corporal in the 2/3rd Pioneer Battalion at the time of his death.

The Battle of Tarakan was the first stage in the Borneo campaign of 1945. It began with an amphibious landing by Allied forces on 1 May, code-named Operation Oboe One; the Allied ground forces were drawn mainly from the Australian 26th Brigade, but included a small element of Netherlands East Indies personnel. The main objective of the landing was the capture of the island's airfield. While the battle ended with success for the Allied forces over the Japanese defenders, this victory is generally regarded as having not justified its costs. The airfield was so heavily damaged that it ultimately could not be repaired in time to make it operational for other phases of the Allied campaign in Borneo.