Gregory Duncan Woolf, FSA, FSA Scot, FBA (born 3 December 1961) is a British ancient historian, archaeologist, and academic. He specialises in the late Iron Age and the Roman Empire. Since July 2021, he has been Ronald J. Mellor Chair of Ancient History at University of California, Los Angeles. He previously taught at the University of Leicester and the University of Oxford, and was then Professor of Ancient History at the University of St Andrews from 1998 to 2014. From 2015 to 2021, he was the Director of the Institute of Classical Studies, and Professor of Classics at the University of London.