Lieutenant General Sir Thomas Arbuthnot, KCB (11 September 1776 – 26 January 1849[1]) was a British Army commander.

[1] He entered the British Army as an ensign in the 29th Regiment of Foot in November 1795.

[2] He then joined the Quarter-master General's department and served under Sir John Moore on the Peninsula from May 1803.

[2] Arbuthnot was promoted to major in the 5th West India Regiment in the West Indies in April 1808 before being appointed assistant adjutant-general in General Picton's division for the greater part of the Peninsular War.

Promoted to lieutenant-colonel, he became deputy quartermaster general at the Cape of Good Hope in May 1810.