Captain Thomas Benton Weir (1838–1876) was an officer in the 7th Cavalry Regiment (United States), notable for his participation in the Battle of the Little Bighorn, also known as Custer's Last Stand, where Weir led a force that attempted to come to Custer's aid, but was driven back to established defensive positions. A hill on the battlefield, Weir Point, is named in his honor and marks the furthest point of the advance of the would-be relief force. Reportedly deeply depressed by his experience in the historic battle, Weir's health declined, and he died only a few months afterwards.