Alfred Giles (18 February 1846 – 20 March 1931), born in Datchet, England, was a South Australian bushman, drover and explorer who crossed Australia from south to north seven times, most in connection with the building of the Overland Telegraph Line 1870–1872.
Giles was a son of Christopher Giles (ca.1798 – 26 April 1884) a member of the Corn Exchange, London, and his wife Hannah Giles (ca.1814 – 17 February 1900).
He came to Australia with his parents, three brothers and two sisters, leaving London on 21 January 1849 on the Calcutta, arriving in South Australia on 22 June 1849. They were accompanied by a large quantity of merchandise and other property, including a portable cottage, which they erected at his 400-acre property on the River Wakefield.
In 1853 his father took up a lease of land at Ketchowla Station which is located between Terowie and Morgan. Giles and his family were later joined by Hillary Boucaut in 1861. In 1864, after a series of poor seasons and considerable losses, he sold his interest and retired to the city.
Alfred Giles was educated at J. L. Young's Adelaide Educational Institution, and after leaving school joined the party which John Ross had organised to traverse the country in 1870, planning the route for Charles Todd's Overland Telegraph Line, Giles being placed second in command. The party was the second to cross the unexplored interior of Central Australia, 300 miles to the east of John McDouall Stuart's 1862 route. In the diary kept by Alfred Giles during the Overland Telegraph Survey Expedition, he records the movement of the exploration party between camps and includes drawings of expedition party members, the lyrics of a song by John P. Ordway, and other observations. On 4 January 1871, Giles wrote:
"Spelling all day in order to ascend Central Mt. Sturt, Mr. Ross started at 8 am to ascend the Mount and about 9 am Mr. Harvey and Mr. Hearn followed. At 11.30 am Mr. Ross returned having ascended the Mount, found the cairn stones raised by Stuart, and bringing with him the bottle buried by Stuart containing papers. The bottle is apparently one generally used for French capers and capped with oilskin and sealed; Inside is a thin roll also wrapped in waterproof cloth and tied with hemp, and outside all is a copy of the Adelaide "Observer" dated January 7, 1860. The whole is in excellent preservation although about eleven years since the Explorer planted it. Mr. Ross will forward the bottle unopened to Adelaide for the inspection of Mr. Todd. This is the first party to reach the Centre since the gallant Stuart planted the British flag in Central Australia."