Ernst Badian (8 August 1925 – 1 February 2011) was an Austrian-born classical scholar who served as a professor at Harvard University from 1971 to 1998.
Badian was born in Vienna in 1925 and in 1938 fled the Nazis with his family to New Zealand. There he attended the University of Canterbury, Christchurch (then Canterbury College), where he met his future wife Nathlie Ann Wimsett. He received a BA in 1945 and an MA the following year.
After a year teaching at the Victoria University of Wellington, Badian went to University College, Oxford, where he studied under George Cawkwell, gained a first class BA in Litt Hum in 1950, an MA in 1954 and a DPhil in 1956. In addition, he gained the degree of LittD from New Zealand's Victoria University of Wellington in 1962.
After teaching in the universities of Sheffield, Durham, and Leeds in England and at the State University of New York, Buffalo, he was appointed to Harvard's Department of History in 1971 and was cross-appointed to the Department of the Classics in 1973. He became John Moors Cabot Professor of History Emeritus in 1998.
An active promoter of classical studies in the United States, Badian helped found The American Journal of Ancient History (1976), the Association of Ancient Historians (1974), and the New England Ancient History Colloquium.
Badian was elected a fellow of the American Academy of Arts and Sciences in 1974.
In 1999 Austria awarded him the Cross of Honor for Science and Art (Österreichische Ehrenkreuz für Wissenschaft und Kunst). The same year, the University of Canterbury awarded him an honorary degree.
Badian died at the age of 85 after a fall in his home in Quincy, Massachusetts. He was survived by his widow Nathlie, his children Hugh and Rosemary, and several grandchildren and great-grandchildren.
The Ernst Badian Collection of Roman Republican Coins is housed by the Special Collections and University Archives of the Rutgers University libraries.
At the 2012 meeting of the Association of Ancient Historians in Chapel Hill, North Carolina, ancient historians T. Corey Brennan and Jerzy Linderski delivered papers reflecting on the historical methodologies employed by Badian.