Henry Fox, 1st Baron Holland, PC was an English peer and Whig politician who served as the Secretary at War from 1746 to 1755. He also held the offices of Secretary of State for the Southern Department from 1755 to 1756 and Paymaster of the Forces from 1757 to 1765, enriching himself while holding the latter office. While Fox was widely tipped as a potential candidate for the office of Prime Minister, he never held the office. His third son was the Whig statesman Charles James Fox.

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 Secretaries of State. The position was combined with that of Secretary of State for War in 1854 and abolished in 1863.