HMAS Yarra (U77), named for the Yarra River, was a Grimsby-class sloop of the Royal Australian Navy (RAN) that served during World War II. Commissioned in 1936, Yarra spent the early part of the war in Australian waters, then was transferred to the East Indies Station in 1940. The sloop operated in the Red Sea, then was involved in the Anglo-Iraqi War and the Anglo-Soviet invasion of Iran. After operating as part of the Tobruk Ferry Service in the Mediterranean during November, Yarra was reassigned to Southeast Asia in response to Japanese attacks. On 4 March 1942, Yarra was attacked and sunk by a force of Japanese cruisers and destroyers while attempting to protect ships withdrawing to Australia.
The deterioration of the Allied position in Southeast Asia promoted a general withdrawal south. On 2 March, Yarra arrived at Tjilatjap with the depot ship Anking, the tanker Francol, and the minesweeper MMS-51: the sloop was ordered to escort the other three ships to Fremantle. A day later, the ship rescued forty survivors of the Dutch ship Paragi from liferafts.
Early on 4 March 1942, the convoy encountered a Japanese fleet: the cruisers Atago, Takao, and Maya, accompanied by four destroyers. Yarra's commander, Robert William Rankin, laid down a smokescreen, then ordered the convoy to scatter while the sloop held off the Japanese warships. Despite the efforts of Yarra, the other three Allied ships were pursued and sunk, and the sloop was sunk by cruiser gunfire shortly after 08:00, with only 34 survivors from the ship's company and the Paragi rescuees. Attrition reduced the number of survivors to 13 by the time they were rescued on 9 March by the Dutch submarine K XI.
The sloop's wartime service was later recognised with two battle honours: "Libya 1941" and "East Indies 1942". In March 2013, Governor-General Quentin Bryce announced that a Unit Citation for Gallantry would be retroactively awarded to the ship's company of Yarra at the time of her sinking. This was presented to the Chief of Navy and the ship's company of the minehunter HMAS Yarra (M 87), on the River Yarra, on 4 March 2014, the anniversary of the sloop Yarra's loss.
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