Benjamin Piatt Runkle (September 3, 1836 – June 28, 1916) was one of the seven founders of Sigma Chi fraternity and an officer in the Union Army during the American Civil War. He served as Chief Superintendent of Freedmen's Affairs in Kentucky, and was plaintiff in the Supreme Court case Runkle v. United States. Runkle was also an Episcopal rector and twice served as trustee of Miami University.