George Sydney Aldridge (23 July 1847 – 21 August 1911) was an Australian businessman, a longtime president of the Adelaide Stock Exchange.

He was educated at St Peter's College when Archdeacon Farr was head master, and was a brilliant student, gaining the highest marks at the competitive examination when Richard Graves MacDonnell, Governor of South Australia, was president of the board of governors.

Three years afterwards, he joined, with J. le M. F. J. Servante and Wickliffe Snow, the mining boom in the Northern Territory, where they discovered the Woolwonga Mine, which they worked successfully for 12 months, then Aldridge went on to the Sandy Creek diggings and was doing well until an attack of malaria forced him to return to Adelaide.

In 1888 Aldridge became a member of the Stock Exchange, and succeeded[1] founding president Henry Bellingham (1807–1889[2]), a position he held with distinction for a little over 13 years,[3] encompassing both the Broken Hill and Kalgoorlie booms.

[6] James Henry Aldridge (4 July 1849 – 11 November 1929), hotelier and horse racing aficionado, was a brother.