HMAS Warrego, named for the Warrego River, was a River-class torpedo-boat destroyer of the Royal Australian Navy (RAN). Ordered in 1909, construction of the destroyer started in Scotland, but she was then broken down and reassembled at Cockatoo Island Dockyard in order for the Australian shipbuilding industry to gain experience in warship construction. Warrego was commissioned into the RAN in 1912, and spent her early career operating in Australian waters.

At the start of World War I, Warrego was assigned to the Australian force tasked with neutralising German colonies in the region, along with finding and destroying the German East Asia Squadron. She was involved in the capture of Rabaul and the Battle of Bita Paka during 1914.

After patrol work in Australian, New Guinea, and South-east Asian waters, Warrego and her sister ships were assigned to the Mediterranean in 1917, and served as an anti-submarine patrol force. The ship participated in the Second Battle of Durazzo in 1918. Following the war's end, Warrego returned to Australia, and was placed in reserve.

The destroyer was reactivated for short periods in 1920 and 1928, but was paid off in 1928 and marked for disposal. The destroyer was partially disassembled, then used as an accommodation hulk at Cockatoo Island. Warrego sank at her berth in 1931, and was demolished with underwater charges.

Warrego had a displacement of 700 tons, a length overall of 246 feet (75 m), and beam of 24 feet 3.5 inches (7.404 m), and a maximum draught of 8 feet 10 inches (2.69 m). The destroyer was powered by three Yarrow oil-burning boilers connected to Parsons turbines, which delivered 10,000 shaft horsepower to three propeller shafts.

Warrego's maximum speed was 26 knots (48 km/h; 30 mph), and she had a cruising speed of 11.5 knots (21.3 km/h; 13.2 mph), giving the ship a range of 2,690 nautical miles (4,980 km; 3,100 mi). The ship's company consisted of between 66 and 73 personnel, including five officers.

The destroyer's main armament consisted of a single BL 4-inch Mark VIII naval gun, supplemented by three QF 12-pounder 12 cwt naval guns. She was also fitted with three .303-inch machine guns and three single 18-inch torpedo tubes. Later in Warrego's career, the destroyer was fitted with four chutes and two throwers for depth charges.

Warrego, along with sister ships Yarra and Parramatta, were ordered on 6 February 1909; the first ships to be ordered for the Commonwealth Naval Forces, the post-Federation amalgamation of the Australian colonial navies. Warrego was laid down by Fairfield Shipbuilding and Engineering Company, but when she reached launch condition, the destroyer was disassembled and transported to Australia by ship. She was re-laid at Cockatoo Island Dockyard in December 1910. The reasoning behind this was to raise the standard of the Australian shipbuilding industry by giving Cockatoo Island hands-on experience in warship construction.