Charles Scott Todd (January 22, 1791 - May 17, 1871) was a United States army officer and government official. He was a subaltern and judge-advocate of General James Winchester's division in the War of 1812. In 1813, he was made a captain of infantry, and was an aide to General William Henry Harrison in the Battle of the Thames. In March, 1815, he was made inspector-general, with the rank of colonel. In 1817, he was the Secretary of State of Kentucky. From 1841 to 1845 he was the United States Ambassador to Russia.