Algernon Emory Smith (September 17, 1842 – June 25, 1876) was an officer in the U.S. 7th Cavalry Regiment who was killed in the Battle of the Little Bighorn in the Montana Territory. Smith was born in the state of New York, where he attended Hamilton College. In June 1862, during the American Civil War, he enlisted in Company K, U.S. 7th Infantry Regiment. He became a lieutenant in the 117th New York Volunteer Infantry Regiment until October 1863 when he assigned to Maj. Gen. Alfred Terry as an aide-de-camp. He was severely wounded at Fort Fisher in January 1865. He was later breveted to major for his actions in the war.