Lieutenant-General Sir Thomas Sydney Beckwith KCB (17 February 1770 – 15 January 1831) was an English officer of the British Army who served as quartermaster general of the British forces in Canada during the War of 1812, and a commander-in-chief of the Bombay Army during the British Raj. He is most notable for his distinguished service during the Peninsular War and for his contributions to the development and command of the 95th Rifles.