Thomas Babington Macaulay, English poet, historian, and politician, Secretary at War (died 1859)

Thomas Babington Macaulay, 1st Baron Macaulay, was an English historian, poet, and Whig politician, who served as the Secretary at War between 1839 and 1841, and as the Paymaster General between 1846 and 1848. He is best known for his The History of England, a seminal example of Whig history which expressed Macaulay's belief in the inevitability of sociopolitical progress and has been widely commended for its prose style. Macaulay also played a substantial role in determining India's education policy.

The secretary at war was a political position in the English and later British government, with some responsibility over the administration and organization of the Army, but not over military policy. The Secretary at War ran the War Office. After 1794 it was occasionally a Cabinet-level position, although it was considered of subordinate rank to the secretary of state for war. The position was combined with that of secretary of state for war in 1854 and abolished in 1863.