Admiral Sir Ernest Frederick Augustus Gaunt, (25 March 1865 – 20 April 1940) was an Australian-born Royal Navy officer who went on to be Commander-in-Chief, Western Approaches.

Gaunt was born in Beechworth, Victoria, Australia, the son of William Henry Gaunt and Elizabeth Mary Palmer. Gaunt joined the Royal Navy in 1878 at the age of 13. Gaunt was, in 1898 and 1899, 1st Commissioner for Weihawei and Administrator for Liukungtao, China. In 1900, he was Commissioner and Superintending transport officer Weihawei, China, at the time of the Boxer Rebellion. In August 1901, he was appointed in command of the cruiser HMS Scout, which served with the Mediterranean Fleet and in June 1902 replaced HMS Harrier as special service vessel at Constantinople. The vessel visited Constanța, the main seaport of Romania, in October 1902, then travelled on the Danube to Galați.

He transferred to HMS Mohawk in February 1903, as she replaced Scout at Constantinople. In December 1903, he commanded a landing party from Mohawk at Durbo, on the coast of Italian Somaliland, where he was wounded. In 1905, as commander of , he took possession of the Ashmore Islands in the Indian Ocean on behalf of the United Kingdom.

In 1913, he became Commodore of the Royal Naval Barracks, Chatham, England, and in 1913 and 1914, he was aide-de-camp to King George V. In 1916, during World War I, he served as second-in-command of the 1st Battle Squadron at the Battle of Jutland as Rear Admiral;