Thomas Ward Custer (March 15, 1845 – June 25, 1876) was a United States Army officer and two-time recipient of the Medal of Honor for bravery during the American Civil War. A younger brother of George Armstrong Custer, he served as his aide at the Battle of Little Bighorn against the Lakota and Cheyenne in the Montana Territory. The two of them, along with their younger brother, Boston Custer, were killed in the overwhelming defeat of United States forces.