Brigadier Aubertin Walter Sothern Mallaby CIE OBE (12 December 1899 – 30 October 1945) was a British Indian Army officer killed in a shootout during the Battle of Surabaya in what was then the Netherlands East Indies during the Indonesian National Revolution.
At the time of his death, Mallaby was the Commanding Officer (CO) of the 49th Indian Infantry Brigade.
Mallaby's death became a major event of hostilities in Surabaya surrounding Indonesian Independence, triggering a retaliatory military action by British forces in the city.