The flag of Heard Island and McDonald Islands (🇭🇲) features a dark blue background with the Southern Cross constellation in the hoist-side quadrant. The Union Jack is displayed in the canton, representing the islands' historical ties to Australia. The five white stars of the Southern Cross symbolize the islands' location in the southern hemisphere. The flag represents the remote and uninhabited nature of Heard Island and McDonald Islands, which are Australian external territories located in the Indian Ocean.