Lieutenant Colonel[1][2] George Thomas d'Aguilar (11 August 1783 – 9 October 1839) was a British Army officer.

His wife Catherine was the aunt of the explorer Sir Richard Francis Burton.

[3][4] D'Aguilar traveled to Calcutta on 14 November 1790 and entered the first Battalion of the 13th Regiment of Foot in Varanasi.

He served in the battalion's advance with Colonel Philpot's brigade, and subsequently in Sir Dyson Marshal's division, he commanded 5 companies at Mundla in 23 to 27 April 1818, and under the personal direction of Gen. J. Watson, in HMS 14th regiment he was allowed to join the 1st battalion 13th regiment.

In August 1818 he went to Ceylon and then to Barrackpore with some volunteers, but the conflicts in those places were repressed and he returned his corps at Aligarh.