First Sergeant Ivers S. Calkin (May 29, 1836 to February 16, 1902) was an American soldier who fought in the American Civil War. Calkin received the country's highest award for bravery during combat, the Medal of Honor, for his action during the Battle of Sayler's Creek in Virginia on 6 April 1865. He was honored with the award on 3 May 1865.