Sir Thomas Reynell, 6th Baronet KCB (1777–1848) was a 19th century British Army officer. He was Colonel in Chief of the 71st Highlanders from 1841 to 1848. As a "career soldier", Reynell devoted his entire career to the army, serving from the age of 16. He saw action in several battles and wars, including Battle of Cape Town, the Peninsular Wars in Portugal, and Siege of Bhurtpore in India.