Iron Nation (February 1815—November 15, 1894) was a principal chief of the Lower Brulé Lakota. He was one of the signers of the September 17, 1851 Treaty of Fort Laramie along with people from Lakota, Cheyenne, Arapaho, and other tribes. He also signed the October 14, 1865 treaty at Fort Sully with other Lakota chiefs, which established the Lower Brule Indian Reservation. A state historic marker near the Lower Brule Agency reads: Chief Iron Nation died of pneumonia at his home on the Sioux Reservation November 15, 1894.