Ramsay MacMullen (born March 3, 1928 in New York City) is an Emeritus Professor of history at Yale University, where he taught from 1967 to his retirement in 1993 as Dunham Professor of History and Classics. His scholarly interests are in the social history of Rome and the replacement of paganism by Christianity.
MacMullen graduated from Phillips Exeter Academy and summa cum laude from Harvard College.
When MacMullen was honored for a lifetime of scholarly achievement at the 2001 annual meeting of the American Historical Association with the Award for Scholarly Distinction, the award citation called him "the greatest historian of the Roman Empire alive today." With important new books published in 2006 and 2009 and 2011 at the ages of 78 and 81 and 83, he remains a powerful voice for scholarly accuracy and lucidity among students of the Roman world.