Major-General Henry MacKinnon (August 1773 – 19 January 1812), was a British soldier. He commanded the 45th Regiment of Foot, 74th (Highland) Regiment of Foot, and 88th Regiment of Foot in the Napoleonic Peninsular War under the Duke of Wellington. He was killed by the explosion of an enemy magazine during the Siege of Ciudad Rodrigo on 19 January 1812.