HMAS Koolonga was a 4,260 gross tons cargo ship built by Sunderland Shipbuilding Company, South Dock Sunderland, England, in 1914 and bought by McIlwraith, McEacharn Line Pty Ltd, Melbourne and named SS Koolonga. She was requisitioned by the Royal Australian Navy on 6 August 1914, as a collier and supply ship. She was returned to her owners in late 1915. She was sold in 1937 to Madrigal & Company, Philippines and renamed Paz. She was scuttled during the Second World War at Sourabaya Harbour (now Surabaya) in 1942 and was later salvaged by the Imperial Japanese and renamed Hatsu Maru. While at anchor in Manila Bay, Philippines on 13 November 1944, she was attacked by United States Navy carrier aircraft and was sunk.